Preparation process of double-sided sinusoidally modulated polymer film

Abstract

The present invention discloses a process for preparing a double-sided sinusoidally modulated polymer film, comprising: preparing a copper template; preparing a silicone rubber soft template using the copper template; preparing a hard, transparent, and high-temperature-resistant epoxy resin hard template using the silicone rubber soft template; preparing a preformed polymer film; dividing the epoxy resin hard template into an upper template and a lower template, placing the preformed polymer film between the upper and lower templates, and using a microscope to assist in aligning and securing the upper, lower, and preformed polymer films; and performing vacuum hot-pressing to replicate a pattern on the preformed polymer film, i.e., replicating the patterns on the upper and lower templates onto both surfaces of the preformed polymer film, thereby obtaining a double-sided sinusoidally modulated polymer film. The present invention produces a double-sided sinusoidally modulated target sample with substantially in-phase modulation patterns on both sides and good pattern replication quality. This lays a technical foundation for providing a double-sided sinusoidally modulated target that meets the requirements of physical experiments.

Description

Technical Field

[0001] The present invention belongs to the technical field of film material preparation, and more specifically, relates to a preparation process of a double-sided sinusoidally modulated polymer film. Background Art

[0002] In inertial confinement fusion (ICF) implosion research, ignition capsules often employ a multi-shell design. Specifically, the capsule is composed of, from the outside in, an ablative layer of varying densities, a low-density aerogel layer, a glass layer, and a central deuterium-tritium fuel. During laser irradiation experiments, uneven laser intensity distribution and inter-layer roughness can cause hydrodynamic instabilities at the interfaces between adjacent layers of material with varying densities. These instabilities manifest as the growth of Rayleigh-Taylor and Richtmyer-Meshkov instabilities. If these instabilities are not effectively controlled during target firing, the capsule implosion efficiency will be significantly reduced, ultimately leading to ignition failure. Therefore, in order to improve the ignition success rate and energy gain of fusion target capsules, it is necessary to carry out relevant simulation and research work through precise decomposition experiments, that is, to introduce sinusoidal modulation patterns on the target surface, artificially create surface density disturbances to simulate the unevenness of the target capsule surface, and measure the nonlinear growth of the spatiotemporal distribution of target density disturbances during laser ablation of the target to study and estimate the magnitude of its fluid dynamic instability.

[0003] With the advancement of physical diagnostic technology and the deepening of precision decomposition experimental research, the target structures of related modulation targets have become increasingly diversified, expanding from simple single-medium planar modulation targets to dual-medium composite modulation targets, even multi-medium cylindrical shock tubes, and double-sided modulation targets. Currently, there are numerous reports on experimental studies of fluid dynamic instabilities based on various types of modulation targets, but the specific target preparation methods are rarely disclosed. Domestically, there has been considerable research on single-medium planar modulation targets, and their preparation technology is relatively mature. However, there has been less progress in the preparation of dual-medium composite modulation targets, and the available work has primarily focused on the composite preparation of silica aerogels and carbon aerogels, CH films and carbon aerogels, and CH films and metals. Wu et al. addressed the lack of follow-up research on a target type known as a "CH film-low-density CH foam dual-medium modulation target"—a target that has been experimentally studied internationally—and explored and established a composite preparation process. However, there are no reports on the development of double-sided sinusoidally modulated thin film targets. In addition to certain requirements for the elemental composition of the target material, the key indicators of the double-sided sinusoidal modulated target are the period and amplitude of the double-sided modulation pattern and the phase of the double-sided modulation pattern being consistent or exactly opposite. Summary of the Invention

[0004] An object of the present invention is to solve at least the above problems and / or disadvantages and to provide at least the advantages which will be described hereinafter.

[0005] In order to achieve these objects and other advantages according to the present invention, a process for preparing a double-sided sinusoidally modulated polymer film is provided, comprising the following steps:

[0006] Step 1: preparing a copper template;

[0007] Step 2: Prepare a silicone rubber soft template using the copper template prepared in step 1;

[0008] Step 3: Using the silicone rubber soft template prepared in step 2 to prepare a hard, transparent, high-temperature resistant epoxy resin hard template;

[0009] Step 4: preparing a preformed polymer film;

[0010] Step 5: Separate the epoxy resin hard template prepared in step 3 into an upper template and a lower template, place the preformed polymer film between the upper template and the lower template, and use a microscope to assist in aligning and fixing the upper template, the lower template, and the preformed polymer film;

[0011] Step 6: Vacuum hot pressing to replicate the pattern on the preformed polymer film, that is, to replicate the patterns on the upper template and the lower template to the two surfaces of the preformed polymer film respectively, to obtain a double-sided sinusoidally modulated polymer film.

[0012] Preferably, the specific method of preparing the copper template in step 1 includes: using a diamond lathe to simultaneously produce three modulation patterns with different amplitudes on a copper disc, and using laser processing to produce marking lines for pattern alignment in the diameter direction and concentric ring direction of the copper disc.

[0013] Preferably, in the step 1, the pattern period of the copper template is 0 to 50 μm, and the amplitudes are 0.5 μm, 1 μm, and 2 μm respectively.

[0014] Preferably, the specific method of step 2 comprises: thoroughly mixing a two-component silicone resin and a curing agent with a magnetic stirrer to obtain a mixture, wherein the weight ratio of the two-component silicone resin to the curing agent is 10:1 to 10:1.5, and allowing the mixture to stand in a vacuum oven for vacuum degassing for 30 minutes; pouring the degassed mixture onto a copper template with a thickness control accessory placed on a horizontal platform so that the liquid level of the mixture slightly protrudes from the surface of the limit ring, covering it with a copper plate with a flat bottom surface, and curing it in a vacuum oven at 60°C for 6 to 9 hours, then heating it to 120°C and curing it for 2 hours, and removing the cured silicone rubber soft template after cooling;

[0015] The curing agent is azobisisobutyl cyanide.

[0016] Preferably, the specific method of step three includes: weighing appropriate amounts of components A and B of the two-component epoxy resin in a weight ratio of 100:83, using a magnetic rotor or a glass rod to fully stir and mix the components A and B of the two-component epoxy resin, placing them in a vacuum box for evacuation and standing to remove bubbles to obtain a mixed product, using a dropper to draw the mixed product and slowly dripping it into the cavity of a silicone rubber soft template placed on a horizontal platform, trying to avoid introducing bubbles, until the liquid level slightly protrudes from the surface of the silicone rubber soft template, covering it with a polytetrafluoroethylene disc of appropriate size so that the back of the epoxy resin template obtained after curing is flat, curing at 120°C for 4 to 16 hours, then continuing to treat at 180°C for 2 hours, and cooling to room temperature to obtain an epoxy resin hard template.

[0017] Preferably, the specific method of step 4 includes: using a hot pressing machine to prepare a preformed polymer film with a diameter of 50 mm, adjusting the thickness of the preformed polymer film with a 0.01 mm titanium sheet, using the titanium sheet as a feeler gauge, and controlling the thickness of the preformed polymer film with the thickness of the titanium sheet, performing a surface polishing treatment on the preformed polymer film, controlling the heating temperature to 150° C., the pre-pressing pressure to 0.5 tons, the pre-pressing time to 3 minutes, the molding pressure to 5 tons, and the hot pressing time to 5 minutes, maintaining the pressure constant, cooling to 80° C. with compressed air, obtaining the preformed polymer film, and opening the mold to take samples;

[0018] The preformed polymer film is one of polystyrene, polyethylene and polypropylene films.

[0019] Preferably, the specific method of step five includes: placing the upper template at a height of 0.1 mm from the surface of the microscope stage, placing the lower template and the preformed polymer film together on the lower glass slide, and under microscope observation, after the marking lines on the upper template and the lower template overlap, pressing the upper template, the lower template, the preformed polymer film, the upper glass slide, and the lower glass slide together and fixing them with binder clips to ensure that there is no relative displacement between the components.

[0020] Preferably, the specific method of step six includes: aligning and placing the lower glass slide, lower template, prefabricated film, upper template, and upper glass slide, placing them in a vacuum oven in a cooling state, evacuating to the ultimate vacuum, heating to 180°C, maintaining the vacuum state for 2 hours, stopping heating, and naturally cooling to room temperature for sampling to obtain a double-sided sinusoidally modulated polymer film.

[0021] Preferably, the two-component silicone resin is Sylgard 184 two-component silicone resin;

[0022] The two-component epoxy resin is Conapoxy FR-1080 two-component epoxy resin.

[0023] Preferably, after obtaining the double-sided sinusoidally modulated polymer film in step 6, the sample morphology and pattern quality of the double-sided sinusoidally modulated polymer film are characterized using an optical measuring microscope, a white light interferometer, and a profile interferometer.

[0024] The present invention has at least the following beneficial effects:

[0025] The present invention utilizes the unique properties of soft silicone rubber: good transparency, low surface energy, weak adhesion to other materials, and easy separation. It also has good toughness, can withstand certain deformation without damage, and has low viscosity for easy peeling. In the field of precision micro-manufacturing, pattern replication accuracy can reach 10nm. Therefore, a silicone rubber soft template is used to replicate the pattern on a soft metal mold (copper template). The resulting silicone rubber soft template is then used as a template, and a transparent, high-temperature-resistant epoxy resin is poured onto its surface. After curing, the silicone rubber soft template is peeled off to obtain a transparent epoxy resin hard template with a precisely modulated pattern. To facilitate the alignment of the upper and lower templates, a 10μm-wide marking line is created in the pattern area of ​​the metal mold using laser processing. During the pattern replication process between the silicone rubber soft template and the epoxy resin hard template, the marking line is also replicated on the epoxy resin hard template, facilitating subsequent alignment of the upper and lower templates.

[0026] The invention determines the technical route for preparing the double-sided modulation film: copper template, silicone rubber soft template, transparent epoxy resin hard template, preformed film, micro pattern alignment, vacuum hot embossing pattern replication.

[0027] After determining the materials and preparation conditions involved in each process step, they successfully obtained a silicone rubber soft template, an epoxy resin hard template, and a preformed polymer film. Two epoxy resin patterns were vacuum-hot embossed onto the two surfaces of the preformed polymer film, successfully replicating the modulated pattern. For samples with a modulation pattern period greater than 30μm, the pattern replication accuracy was high and the pattern phase was essentially consistent.

[0028] Other advantages, objectives and features of the present invention will be reflected in part from the following description and will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 Schematic diagram of the structure of the double-sided sinusoidally modulated polymer film vacuum hot pressing sample;

[0030] Figure 2 This is a physical diagram of the copper template;

[0031] Figure 3 This is an enlarged schematic diagram of the local structure of the copper template;

[0032] Figure 4 This is a schematic diagram of the results of profilometer scanning of a pattern with a period of 10 μm on a copper template;

[0033] Figure 5 This is a schematic diagram of the profilometer scanning results of a pattern with a period of 30μm on a copper template;

[0034] Figure 6 This is a physical schematic diagram of the silicone rubber soft template;

[0035] Figure 7 This is the white light interference pattern of a certain part of the silicone rubber soft template;

[0036] Figure 8 This is the white light interference pattern of a certain part of the silicone rubber soft template;

[0037] Figure 9 This is a microscopic enlarged schematic diagram of the pattern modulation area of ​​the silicone rubber soft template;

[0038] Figure 10 This is a microscopic enlarged schematic diagram of the pattern modulation area of ​​the silicone rubber soft template;

[0039] Figure 11 This is a microscopic diagram of the end surface of the silicone rubber soft template;

[0040] Figure 12 Optical microscopic images of three pattern details of the epoxy resin hard template;

[0041] Figure 13 This is a schematic diagram of the test results of the epoxy resin hard template profilometer;

[0042] Figure 14 This is a schematic diagram of the test results of the epoxy resin hard template profilometer;

[0043] Figure 15 Schematic diagram of the front pattern of the double-sided sinusoidally modulated polymer film;

[0044] Figure 16 Schematic diagram of the reverse side pattern of the double-sided sinusoidally modulated polymer film;

[0045] Figure 17 Schematic diagram of the observation of the end-face modulation pattern of the double-sided sinusoidally modulated polymer film;

[0046] Figure 18 Schematic diagram comparing the profilometer test results of the front and back patterns of a double-sided sinusoidally modulated polymer film with a pattern period of 30 μm;

[0047] Figure 19 This is a profilometer test image of the front side pattern of a double-sided sinusoidally modulated polymer film with a pattern period of 10μm;

[0048] Figure 20This is a profilometer test image of the back surface pattern of a double-sided sinusoidally modulated polymer film with a pattern period of 10μm. DETAILED DESCRIPTION

[0049] The present invention will be described in further detail below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0050] It should be understood that terms such as “having”, “including” and “comprising” used herein do not preclude the existence or addition of one or more other elements or combinations thereof.

[0051] Example 1

[0052] This embodiment provides a preparation process for a double-sided sinusoidally modulated polymer film, comprising the following steps:

[0053] Step 1: Prepare a copper template. The specific method includes: using a diamond lathe to simultaneously produce three modulation patterns with different amplitudes on a copper disk, and using laser processing to produce marking lines for pattern alignment in the diameter direction and concentric ring direction of the copper disk; the pattern period of the copper template is 10μm, and the amplitudes of the three modulation patterns are 0.5μm, 1μm, and 2μm respectively;

[0054] Step 2: Prepare a silicone rubber soft template using the copper template prepared in step 1. The specific method includes: thoroughly mixing Sylgard 184 two-component silicone resin and azobisisobutyl cyanide with a magnetic stirrer to obtain a mixture, wherein the weight ratio of the two-component silicone resin to azobisisobutyl cyanide is 10:1, and standing the mixture in a vacuum oven for vacuum degassing for 30 minutes; pouring the degassed mixture onto a copper template with a thickness control accessory placed on a horizontal platform so that the liquid level of the mixture slightly protrudes from the surface of the limit ring, covering it with a copper plate with a flat bottom, and curing it in a vacuum oven at 60°C for 6 hours, then heating it to 120°C and curing it for 2 hours. After cooling, the cured silicone rubber soft template is removed.

[0055] Step 3: Using the silicone rubber soft template prepared in step 2, a hard, transparent, and high-temperature resistant epoxy resin hard template is prepared. The specific method includes: weighing appropriate amounts of components A and B of Conapoxy FR-1080 two-component epoxy resin in a weight ratio of 100:83, thoroughly stirring and mixing components A and B of the two-component epoxy resin using a magnetic rotor or a glass rod, evacuating the mixture in a vacuum chamber, allowing the mixture to stand for removal of bubbles, and obtaining a mixed product. The mixed product is pipetted and slowly dripped into the cavity of a silicone rubber soft template placed on a horizontal platform, minimizing the introduction of bubbles, until the liquid level slightly protrudes from the surface of the silicone rubber soft template. A polytetrafluoroethylene disc of an appropriate size is then placed on the template to ensure that the back of the epoxy resin template is flat after curing. The mixture is cured at 120° C. for 4 hours, then further cured at 180° C. for 2 hours, and cooled to room temperature to obtain the epoxy resin hard template.

[0056] Step 4: preparing a preformed polystyrene film, specifically comprising: using a hot pressing machine to make a preformed polystyrene film with a diameter of 50 mm, adjusting the thickness of the preformed polystyrene film with a 0.01 mm titanium sheet, polishing the surface, controlling the heating temperature to 150° C., the pre-pressing pressure to 0.5 tons, the pre-pressing time to 3 minutes, the molding pressure to 5 tons, the hot pressing time to 5 minutes, maintaining the pressure constant, cooling to 80° C. with compressed air, obtaining the preformed polystyrene film, and opening the mold to take samples;

[0057] Step 5: Divide the epoxy resin hard template prepared in step 3 into an upper template and a lower template, such as Figure 1 As shown, a preformed polystyrene film 3 is placed between an upper template 4 and a lower template 2, and a microscope is used to assist in alignment and fixation of the upper template 4, the lower template 2, and the preformed polystyrene film. The specific method includes: placing the upper template 4 at a height of 0.1 mm from the surface of the microscope stage, placing the lower template 2 and the preformed polystyrene film 3 together on a lower glass slide 1, and under microscope observation, after the marking lines on the upper template 4 and the lower template 2 overlap, pressing the upper template 4, the lower template 2, the preformed polystyrene film 3, the upper glass slide 5, and the lower glass slide 1 together, and placing a binder clip 6 on the upper glass slide 5 to fix them, ensuring that there is no relative displacement between the components;

[0058] Step 6. Vacuum hot pressing to replicate the pattern on the preformed polystyrene film, that is, to replicate the patterns on the upper template and the lower template onto the two surfaces of the preformed polystyrene film respectively, to obtain a double-sided sinusoidally modulated polymer film. The specific method includes: aligning and placing the lower glass slide, lower template, prefabricated film, upper template, and upper glass slide, placing them in a vacuum oven in a cooling state, evacuating to the ultimate vacuum, heating to 180°C, maintaining the vacuum state for 2 hours, stopping heating, and naturally cooling to room temperature for sampling to obtain a double-sided sinusoidally modulated polymer film.

[0059] Example 2

[0060] This embodiment provides a preparation process for a double-sided sinusoidally modulated polymer film, comprising the following steps:

[0061] Step 1: Prepare a copper template. The specific method includes: using a diamond lathe to simultaneously produce three modulation patterns with different amplitudes on a copper disk, and using laser processing to produce marking lines for pattern alignment in the diameter direction and concentric ring direction of the copper disk; the pattern period of the copper template is 30μm, and the amplitudes are 0.5μm, 1μm, and 2μm respectively;

[0062] Step 2: Prepare a silicone rubber soft template using the copper template prepared in step 1. The specific method includes: thoroughly mixing Sylgard 184 two-component silicone resin and azobisisobutyl cyanide with a magnetic stirrer to obtain a mixture, wherein the weight ratio of the two-component silicone resin to azobisisobutyl cyanide is 10:1, and standing the mixture in a vacuum oven for vacuum degassing for 30 minutes; pouring the degassed mixture onto a copper template with a thickness control accessory placed on a horizontal platform so that the liquid level of the mixture slightly protrudes from the surface of the limit ring, covering it with a copper plate with a flat bottom, and curing it in a vacuum oven at 60°C for 6 hours, then heating it to 120°C and curing it for 2 hours. After cooling, the cured silicone rubber soft template is removed.

[0063] Step 3: Using the silicone rubber soft template prepared in step 2, a hard, transparent, and high-temperature resistant epoxy resin hard template is prepared. The specific method includes: weighing appropriate amounts of components A and B of Conapoxy FR-1080 two-component epoxy resin in a weight ratio of 100:83, thoroughly stirring and mixing components A and B of the two-component epoxy resin using a magnetic rotor or a glass rod, evacuating the mixture in a vacuum chamber, allowing the mixture to stand for removal of bubbles, and obtaining a mixed product. The mixed product is pipetted and slowly dripped into the cavity of a silicone rubber soft template placed on a horizontal platform, minimizing the introduction of bubbles, until the liquid level slightly protrudes from the surface of the silicone rubber soft template. A polytetrafluoroethylene disc of an appropriate size is then placed on the template to ensure that the back of the epoxy resin template is flat after curing. The mixture is cured at 120° C. for 4 hours, then further cured at 180° C. for 2 hours, and cooled to room temperature to obtain the epoxy resin hard template.

[0064] Step 4: preparing a preformed polystyrene film, specifically comprising: using a hot pressing machine to make a preformed polystyrene film with a diameter of 50 mm, adjusting the thickness of the preformed polystyrene film with a 0.01 mm titanium sheet, polishing the surface, controlling the heating temperature to 150° C., the pre-pressing pressure to 0.5 tons, the pre-pressing time to 3 minutes, the molding pressure to 5 tons, the hot pressing time to 5 minutes, maintaining the pressure constant, cooling to 80° C. with compressed air, obtaining the preformed polystyrene film, and opening the mold to take samples;

[0065] Step 5: Separate the epoxy resin hard template prepared in step 3 into an upper template and a lower template, place the preformed polystyrene film between the upper template and the lower template, and use a microscope to assist in aligning and fixing the upper template, the lower template, and the preformed polystyrene film. The specific method includes: placing the upper template at a height of 0.1 mm from the surface of the microscope stage, placing the lower template and the preformed polystyrene film together on the lower glass slide, and under microscope observation, after the marked lines on the upper and lower templates overlap, pressing the upper template, the lower template, the preformed polystyrene film, the upper glass slide, and the lower glass slide together and fixing them with binder clips to ensure that there is no relative displacement between the components;

[0066] Step 6. Vacuum hot pressing to replicate the pattern on the preformed polystyrene film, that is, to replicate the patterns on the upper template and the lower template onto the two surfaces of the preformed polystyrene film respectively, to obtain a double-sided sinusoidally modulated polymer film. The specific method includes: aligning and placing the lower glass slide, lower template, prefabricated film, upper template, and upper glass slide, placing them in a vacuum oven in a cooling state, evacuating to the ultimate vacuum, heating to 180°C, maintaining the vacuum state for 2 hours, stopping heating, and naturally cooling to room temperature for sampling to obtain a double-sided sinusoidally modulated polymer film.

[0067] Depend on Figure 2 and Figure 3 It can be seen that the surface modulation pattern of the copper template has very rich microstructural details, and the patterns in different positions have certain differences. Figure 2 The copper template shown is provided with three limiting rings, which are used to plan a volume on the copper template, limit the casting amount of the mixture, and control the thickness of the mixture. Figure 4 and Figure 5 It can be seen that the pattern periods are 10 μm and 30 μm, corresponding to Example 1 and Example 2, respectively. Figure 3 and Figure 4 The ordinate is the amplitude of the pattern in μm, and the abscissa is the period of the pattern in mm. Because the profilometer probe is too large to penetrate deeply into the modulation pattern, the amplitude obtained by the profilometer is inaccurate.

[0068] like Figures 6-11 As shown, the white light interference pattern of the silicone rubber soft template ( Figure 7 、 Figure 8 )、Microscopic enlargement ( Figure 9 、 Figure 10 ), clearly shows that the pattern and local defect details on the copper template are well reproduced, Figure 11 The optical micrograph of the silicone rubber cross section clearly shows a complete sinusoidal modulation pattern. This demonstrates the high pattern replication capability of the silicone rubber soft template. Silicone resin can replicate the fine structure of the copper mold surface with high precision.

[0069] Figure 12 The optical micrograph of the epoxy resin hard template pattern is given, and it can be clearly seen that the pattern details of the copper template are well replicated and the modulation pattern is clear. Figure 13 、 Figure 14 ) results show that the period of the modulation pattern is essentially the same as that of the copper and silicone rubber templates. Using the silicone rubber soft template as a foundation, the two-component epoxy resin accurately replicates the microstructure of the silicone resin, with the pattern period and amplitude essentially matching the characteristic dimensions of the silicone rubber soft template.

[0070] The key to the successful development of double-sided modulated films lies in whether the patterns on both sides are accurately replicated and whether the phases of the patterns are consistent or exactly opposite. Figure 15 and Figure 16 It is clearly shown that patterns are embossed on both sides of the double-sided modulated film, and the pattern texture is clear. Figure 17 The quality of film end surface pattern replication observed under an optical microscope is given. Due to the small depth of field of the microscope and the uneven height of the hand-cut end surface, it is difficult to clearly observe the modulation pattern on both the front and back sides at the same time. Figure 17 It has been clearly shown that the patterns have been successfully replicated on both the front and back sides, and the phases of the patterns are basically consistent.

[0071] Figure 18 、 Figure 19 and Figure 20 The profilometer scanning results of the replicated patterns on both sides of two modulation patterns with periods of 30μm and 10μm are given. Figures 18-20 In the figure, the horizontal axis represents the period of the pattern in mm, and the vertical axis represents the amplitude of the pattern in μm. Figure 18 As can be seen, when the modulation pattern amplitude is 30μm, the patterns on both sides are highly consistent, with relatively consistent period, phase, and amplitude. However, when the modulation pattern period is only 10μm, the period of the patterns on both sides is essentially the same, but there is a significant difference in amplitude. This indicates that this technical approach has certain limitations for producing patterns with shorter modulation periods. However, the samples to be prepared in this study have a modulation pattern period of 50μm. Based on the current results, this technical approach is fully capable of producing products that meet the requirements.

[0072] The number of devices and processing scales described herein are intended to simplify the description of the present invention. Applications, modifications, and variations of the present invention will be readily apparent to those skilled in the art.

[0073] Although the embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the description and implementation methods. They can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. An application of a double-sided sinusoidally modulated polymer film, characterized in that: The double-sided sinusoidally modulated polymer film is used to simulate and study the fluid dynamics properties of an inertial confinement fusion implosion target capsule. Specifically, a double-sided sinusoidally modulated polymer film is obtained by introducing sinusoidal modulation patterns on both surfaces of the polymer film. Surface density perturbations are artificially created to simulate target capsule inhomogeneity. The magnitude of the fluid dynamics instability is studied and estimated by measuring the nonlinear growth of the spatiotemporal distribution of the target density perturbations during laser ablation of the double-sided sinusoidally modulated polymer film. The double-sided sinusoidal modulated polymer film is prepared by the following method: Step 1: preparing a copper template; Step 2: Prepare a silicone rubber soft template using the copper template prepared in step 1; Step 3: using the silicone rubber soft template prepared in step 2 to prepare a hard and transparent epoxy resin hard template; Step 4: Using a hot pressing machine to prepare a preformed polymer film with a diameter of 50 mm, the thickness of the preformed polymer film is adjusted with a 0.01 mm titanium sheet, which is used as a feeler gauge to control the thickness of the preformed polymer film. The preformed polymer film is surface polished, and the heating temperature is controlled to be 150° C., the prepressing pressure is 0.5 tons, the prepressing time is 3 minutes, the molding pressure is 5 tons, and the hot pressing time is 5 minutes. The pressure is maintained constant, and the film is cooled to 80° C. using compressed air to obtain a preformed polymer film, and the mold is opened for sampling. The preformed polymer film is one of polystyrene, polyethylene, and polypropylene films. Step 5: Separate the epoxy resin hard template prepared in step 3 into an upper template and a lower template, place the preformed polymer film between the upper template and the lower template, and use a microscope to assist in aligning and fixing the upper template, the lower template, and the preformed polymer film; Step 6: Vacuum hot pressing to replicate the pattern on the preformed polymer film, that is, to replicate the patterns on the upper template and the lower template to the two surfaces of the preformed polymer film respectively, to obtain a double-sided sinusoidally modulated polymer film.

2. The use of the double-sided sinusoidally modulated polymer film according to claim 1, characterized in that: The specific method for preparing the copper template in step 1 includes: using a diamond lathe to simultaneously produce three modulation patterns with different amplitudes on a copper disk, and using laser processing to produce marking lines for pattern alignment in the diameter direction and concentric ring direction of the copper disk.

3. The use of the double-sided sinusoidally modulated polymer film according to claim 1, wherein: In the step 1, the pattern period of the copper template is 0-50 μm, and the amplitudes are 0.5 μm, 1 μm, and 2 μm respectively.

4. The use of the double-sided sinusoidally modulated polymer film according to claim 1, wherein: The specific method of step 2 comprises: thoroughly mixing a two-component silicone resin and a curing agent with a magnetic stirrer to obtain a mixture, wherein the weight ratio of the two-component silicone resin to the curing agent is 10:1 to 10:1.5, and degassing the mixture in a vacuum oven for 30 minutes; pouring the degassed mixture onto a copper template with a thickness control accessory placed on a horizontal platform so that the liquid level of the mixture slightly protrudes from the surface of the limit ring, covering it with a copper plate with a flat bottom, and curing it in a vacuum oven at 60° C. for 6 to 9 hours, then heating it to 120° C. and curing it for 2 hours, and removing the cured silicone rubber soft template after cooling; The curing agent is azobisisobutyl cyanide.

5. The use of the double-sided sinusoidally modulated polymer film according to claim 1, characterized in that: The specific method of step three includes: weighing appropriate amounts of components A and B of a two-component epoxy resin in a weight ratio of 100:83, thoroughly stirring and mixing the components A and B of the two-component epoxy resin using a magnetic rotor or a glass rod, evacuating the mixture in a vacuum box, letting it stand, and removing bubbles to obtain a mixed product, pipetting the mixed product with a dropper and slowly dripping it into the cavity of a silicone rubber soft template placed on a horizontal platform, while minimizing the introduction of bubbles, until the liquid level slightly protrudes from the surface of the silicone rubber soft template, covering it with a polytetrafluoroethylene disc of appropriate size so that the back of the epoxy resin template obtained after curing is flat, curing at 120° C. for 4 to 16 hours, then continuing to treat at 180° C. for 2 hours, and cooling to room temperature to obtain an epoxy resin hard template.

6. The use of the double-sided sinusoidally modulated polymer film according to claim 1, wherein: The specific method of step five includes: placing the upper template at a height of 0.1 mm from the surface of the microscope stage, placing the lower template and the preformed polymer film together on the lower glass slide, and under microscope observation, after the marking lines on the upper and lower templates overlap, pressing the upper template, lower template, preformed polymer film, upper glass slide, and lower glass slide together and securing them with binder clips to ensure that there is no relative displacement between the components.

7. The use of the double-sided sinusoidally modulated polymer film according to claim 1, characterized in that: The specific method of step six includes: aligning and placing the lower glass slide, lower template, prefabricated film, upper template, and upper glass slide, placing them in a vacuum oven in a cooling state, evacuating to the ultimate vacuum, heating to 180° C., maintaining the vacuum state for 2 hours, stopping heating, and naturally cooling to room temperature for sampling to obtain a double-sided sinusoidally modulated polymer film.

8. The use of the double-sided sinusoidally modulated polymer film according to claim 4, wherein: The two-component silicone resin is Sylgard 184 two-component silicone resin.

9. The use of the double-sided sinusoidally modulated polymer film according to claim 5, wherein: The two-component epoxy resin is Conapoxy FR-1080 two-component epoxy resin.

10. The use of the double-sided sinusoidally modulated polymer film according to claim 1, wherein: After the double-sided sinusoidally modulated polymer film is obtained in step 6, the sample morphology and pattern quality of the double-sided sinusoidally modulated polymer film are characterized using an optical measuring microscope, a white light interferometer, and a profile interferometer.

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