Transparent electric drive shape memory composite film and preparation method thereof

Abstract

The invention relates to a transparent electric drive shape memory composite film and a preparation method thereof, and belongs to the technical field of intelligent materials. The transparent electric drive shape memory composite film comprises a shape memory polymer film, a conductive heating layer and a bonding layer located between the shape memory polymer film and the conductive heating layer. The shape memory polymer film is obtained by photo-initiation polymerization of acrylic acid and acrylate monomers under the action of a photoinitiator; the mass ratio of the acrylic acid to the acrylate monomer is (0.5-1): 1; the conductive heating layer comprises a polymer matrix and a silver nanowire conductive film compounded with the polymer matrix; the square resistance of the silver nanowire conductive thin film is 20-100 omega / sq; the two ends of the silver nanowire conductive film are connected with electrodes. The transparent electric drive shape memory composite film provided by the invention has the characteristics of high transparency and remote drive, and the shape recovery process can be regulated and controlled by adjusting the voltage.

Description

Technical Field

[0001] The present invention relates to the technical field of intelligent materials, and particularly to a transparent electro-driven shape memory composite film and a preparation method thereof. Background Art

[0002] Shape memory polymers are intelligent polymer materials that can recover from a temporary shape to an initial shape under specific external stimuli (such as heat, light, electricity, magnetic field, etc.). In recent years, with the progress of materials science, shape memory polymers have shown great application potential in fields such as aerospace, biomedicine, and soft robotics due to their advantages of light weight, large deformation, easy programming, adjustable elastic modulus, etc. Electro-driven is an important driving method for shape memory polymers. By combining shape memory polymers with conductive materials (such as carbon black, carbon nanotubes, silver nanoparticles, etc.), the conductivity of the polymer can be increased, enabling it to respond to electrical stimuli. When the material is energized, the joule heat generated by the internal current causes the shape memory polymer to undergo shape recovery. The electro-driven shape memory polymer composite combines the advantages of shape memory polymers and conductive materials, and has the advantages of remote driving, fast response speed, adjustable driving voltage, and designable composite form and structure. Combining electro-driven with transparent shape memory polymers can solve the problem that transparent shape memory polymers require external heat sources for heating, and expand their application scope in the field of optoelectronic devices. However, existing electro-driven shape memory polymer composites have problems such as complex preparation processes and insufficient transparency. In addition, the preparation methods of transparent shape memory polymers usually involve multi-step chemical treatments and complex equipment requirements, which not only increase production costs but also limit their large-scale applications. Summary of the Invention

[0003] Aiming at one or more technical problems existing in the prior art, the present invention provides a transparent electro-driven shape memory composite film and a preparation method thereof. The transparent electro-driven shape memory composite film provided by the present invention has the characteristics of high transparency and remote drivability, and its shape recovery process can be regulated by adjusting the magnitude of the voltage. It can be used as a transparent functional substrate for flexible electronic devices or optical devices, an electrode for intelligent display devices, etc., expanding the application scope of shape memory polymers in the field of optoelectronic devices.

[0004] The present invention provides a transparent electro-driven shape memory composite film, which comprises a shape memory polymer film, a conductive heating layer, and an adhesive layer located between the shape memory polymer film and the conductive heating layer; the shape memory polymer film is obtained by photoinitiated polymerization of acrylic acid and acrylate monomers under the action of a photoinitiator; the mass ratio of acrylic acid to the acrylate monomer is 0.5-1:1; the conductive heating layer comprises a polymer matrix and a silver nanowire conductive film compounded with the polymer matrix; the sheet resistance of the silver nanowire conductive film is 20-100 Ω / sq; electrodes are connected to both ends of the silver nanowire conductive film.

[0005] Preferably, the light transmittance of the shape memory polymer film is 90-95%; and / or

[0006] the light transmittance of the transparent electro-driven shape memory composite film is 80-90%.

[0007] Preferably, the thickness of the shape memory polymer film is 300-1000 μm;

[0008] the thickness of the adhesive layer is 50-100 μm; and / or

[0009] the thickness of the conductive heating layer is 150-300 μm.

[0010] Preferably, the dosage of the photoinitiator is not more than 2% of the total mass of acrylic acid, acrylate monomer and photoinitiator, and is preferably 0.5-1%.

[0011] Preferably, the acrylate monomer is one or more of 2-hydroxyethyl acrylate, hydroxypropyl acrylate, 2-hydroxyethyl methacrylate, and 2-hydroxypropyl methacrylate; and / or

[0012] the photoinitiator used in the photoinitiated polymerization is 1-hydroxycyclohexyl phenyl ketone.

[0013] Preferably, the photoinitiated polymerization is carried out under ultraviolet light irradiation, the power of the ultraviolet light is 10-30 W, and the irradiation time of the ultraviolet light is 30-60 s.

[0014] Preferably, the adhesive layer uses an ultraviolet curable optical adhesive.

[0015] Preferably, the polymer matrix is a transparent insulating polymer; the transparent insulating polymer is one or more of polyvinyl alcohol, polyvinylpyrrolidone, and polydimethylsiloxane.

[0016] Preferably, the light transmittance of the silver nanowire conductive film is 80-90%; and / or

[0017] The diameter of the silver nanowire in the silver nanowire conductive film is 30 - 50 nm, and the average length is 10 - 100 μm.

[0018] In a second aspect, the present invention provides a method for preparing the transparent electro-driven shape memory composite film described in the first aspect, and the preparation method includes:

[0019] Distribute a polymer solution on the surface of the silver nanowire conductive film, and after curing, form a polymer matrix, and connect electrodes to both ends of the silver nanowire conductive film to obtain a conductive heating layer;

[0020] Bond the conductive heating layer and the shape memory polymer film through an adhesive layer to obtain an electro-driven shape memory composite film.

[0021] Compared with the prior art, the present invention has at least the following beneficial effects:

[0022] The shape memory polymer film of the present invention is prepared by photo-initiated polymerization of acrylic acid and acrylate monomers in a photo-initiator, and has the characteristics of high light transmittance, shape recovery rate, and adjustable glass transition temperature, which can meet different usage requirements; the conductive heating layer includes a silver nanowire conductive film with excellent light transmittance and electro-heating performance. The transparent electro-driven shape memory composite film obtained by the combination of the two has the characteristics of high transparency and remote driving, and its shape recovery process can be regulated by adjusting the magnitude of the voltage. It can be used as a transparent functional substrate for flexible electronic devices or optical devices, an electrode for intelligent display devices, etc., expanding the application scope of shape memory polymers in the field of optoelectronic devices.

[0023] The preparation method of the transparent electro-driven shape memory composite film of the present invention is simple, does not require cumbersome processing steps or complex processing systems (such as chemical solvent treatment, high-temperature treatment, etc.), can be operated at room temperature with short operation time, high preparation efficiency, can effectively reduce costs, can be mass-produced, and can be applied on a large scale. Description of the Drawings

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0025] Figure 1 It is a schematic cross-sectional structure diagram of the electro-driven shape memory composite film provided by the present invention;

[0026] Figure 2 It is a schematic diagram of the shape recovery of the electro-driven shape memory composite film provided by the present invention under electro-driving;

[0027] Figure 3 is the electric heating temperature rise curve (power-on time - temperature curve) of the electro-driven shape memory composite film provided in Embodiment 1 of the present invention;

[0028] Figure 4 is the electric heating cycle curve of the electro-driven shape memory composite film provided in Embodiment 1 of the present invention.

[0029] Reference numerals: 11 - shape memory polymer film; 12 - adhesive layer; 13 - conductive heating layer. Detailed implementation manners

[0030] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0031] The present invention provides a transparent electro-driven shape memory composite film, as Figure 1 shown, including a shape memory polymer film 11, a conductive heating layer 13, and an adhesive layer 12 located between the shape memory polymer film 11 and the conductive heating layer 13; the shape memory polymer film 11 is obtained by photoinitiated polymerization of acrylic acid and acrylate monomers under the action of a photoinitiator; the mass ratio of acrylic acid to the acrylate monomer is 0.5 - 1:1; the conductive heating layer 13 includes a polymer matrix and a silver nanowire conductive film composite with the polymer matrix; the sheet resistance of the silver nanowire conductive film is 20 - 100 Ω / sq; electrodes are connected to both ends of the silver nanowire conductive film.

[0032] It should be noted that in the Figure 1 of the present invention, the various structural layers are peeled off from each other, which is for clearly showing the positional relationship between the various structural layers of the present invention. It should be understood that in fact, the various structural layers of the present invention are closely attached to each other.

[0033] The shape memory polymer film of the present invention is prepared by photoinitiated polymerization of acrylic acid and acrylate monomers in the presence of a photoinitiator. It has the characteristics of high light transmittance, shape recovery rate, and adjustable glass transition temperature, which can meet different usage requirements. The conductive heating layer includes a silver nanowire conductive film with excellent light transmittance and electrothermal performance. The transparent electro-driven shape memory composite film obtained by combining the two has the characteristics of high transparency and remote driving. The shape recovery process can be regulated by adjusting the voltage, and it can be used as a transparent functional substrate for flexible electronic devices or optical devices, an electrode for intelligent display devices, etc., expanding the application scope of shape memory polymers in the field of optoelectronic devices.

[0034] By controlling the mass ratio of acrylic acid and the acrylate monomer, the glass transition temperature of the shape memory polymer film can be regulated in the present invention. Within the above range, as the mass ratio of acrylic acid and the acrylate monomer increases, the glass transition temperature rises. The inventors found that when other conditions remain unchanged, if the mass ratio of acrylic acid and the acrylate monomer is too small, the glass transition temperature of the shape memory polymer film will be too low, being in a soft state at room temperature. Although the programmed shape can be fixed after cooling to a low temperature, the edited shape can spontaneously recover its shape at room temperature, so its applicability is not high, restricting its application. If the mass ratio of acrylic acid and the acrylate monomer is too large, the glass transition temperature of the shape memory polymer film will be high, which is not conducive to shaping. After being combined with the conductive heating layer, the glass transition temperature of the shape memory polymer film cannot be reached under electro-driven conditions or the electro-driven deformation is too slow.

[0035] In the present invention, the light transmittance and heating performance of the silver nanowire conductive film are regulated by controlling its sheet resistance. The sheet resistance of the silver nanowire conductive film is controlled within the above range to ensure both excellent light transmittance and heating performance. If the sheet resistance of the silver nanowire conductive film is too low, the light transmittance of the silver nanowire conductive film will deteriorate significantly; if the sheet resistance of the silver nanowire conductive film is too high, the heating performance of the silver nanowire conductive film will deteriorate significantly, unable to meet the electro-driven requirements of the transparent electro-driven shape memory composite film.

[0036] According to some preferred embodiments, the light transmittance of the shape memory polymer film is 90-95%; and / or

[0037] The light transmittance of the transparent electro-driven shape memory composite film is 80-90%.

[0038] It should be noted that the light transmittance of the above-mentioned shape memory polymer film and transparent electro-driven shape memory composite film is the visible light transmittance.

[0039] According to some preferred embodiments, the thickness of the shape memory polymer film is 300-1000 μm;

[0040] The thickness of the adhesive layer is 50-100 μm; and / or

[0041] The thickness of the conductive heating layer is 150-300 μm.

[0042] According to some preferred embodiments, the amount of the photoinitiator is not more than 2% of the total mass of the acrylic acid, acrylate monomer and photoinitiator, and is preferably 0.5-1%.

[0043] According to some preferred embodiments, the acrylate monomer is one or more of 2-hydroxyethyl acrylate, hydroxypropyl acrylate, 2-hydroxyethyl methacrylate, and hydroxypropyl methacrylate; and / or

[0044] The photoinitiator used in the photoinduced polymerization is 1-hydroxycyclohexyl phenyl ketone.

[0045] According to some preferred embodiments, the photoinduced polymerization is carried out under ultraviolet light irradiation. The power of the ultraviolet light is 10-30 W, and the irradiation time of the ultraviolet light is 30-60 s. In the present invention, the irradiation time of the ultraviolet light is adjusted by regulating the power of the ultraviolet light. The greater the power, the shorter the irradiation time.

[0046] According to some preferred embodiments, the ultraviolet curable optical adhesive used for the adhesive layer is preferably NORLAND optical adhesive, and more preferably one or several of NOA63, NOA73, NOA81, NOA83, and NOA84.

[0047] According to some preferred embodiments, the polymer matrix is a transparent insulating polymer; the transparent insulating polymer is one or more of polyvinyl alcohol, polyvinylpyrrolidone, and polydimethylsiloxane.

[0048] According to some preferred embodiments, the light transmittance of the silver nanowire conductive film is 80-90%; and / or

[0049] The diameter of the silver nanowires in the silver nanowire conductive film is 30-50 nm, and the average length is 10-100 μm.

[0050] In a second aspect, the present invention provides a method for preparing the transparent electro-driven shape memory composite film according to the first aspect. The preparation method includes:

[0051] Distribute a polymer solution on the surface of the silver nanowire conductive film, cure it to form a polymer matrix, and connect electrodes to both ends of the silver nanowire conductive film to obtain a conductive heating layer;

[0052] Bond the conductive heating layer and the shape memory polymer film through an adhesive layer to obtain an electro-driven shape memory composite film.

[0053] The preparation method of the transparent electro-driven shape memory composite film of the present invention is simple, without cumbersome processing steps or complex processing systems (such as chemical solvent treatment, high-temperature treatment, etc.), can be operated at room temperature with short operation time, high preparation efficiency, can effectively reduce costs, can be mass-produced, and can achieve large-scale applications.

[0054] In order to more clearly illustrate the technical solutions and advantages of the present invention, the present invention will be further described below in conjunction with embodiments. The sources of the various reagents used in the examples and comparative examples of the present invention are not specifically limited, and can be directly purchased or synthesized by oneself.

[0055] Example 1

[0056] A preparation method of a transparent electro-driven shape memory composite film, comprising:

[0057] Preparing a shape memory polymer film: Mixing 5 g of acrylic acid, 5 g of 2-hydroxyethyl acrylate, and 0.1 g of photoinitiator 1-hydroxycyclohexyl phenyl ketone and stirring evenly to obtain a precursor solution, pouring the precursor solution into a film mold, and polymerizing under 10 W ultraviolet light for 60 s to obtain a transparent shape memory polymer film.

[0058] Preparing a conductive heating layer: Cutting a PET substrate of appropriate size, spraying a silver nanowire-ethanol dispersion on the substrate on a 50 °C heating plate using an airbrush to obtain a silver nanowire conductive film with a sheet resistance of 20 Ω / sq; Mixing polydimethylsiloxane and a curing agent in a weight ratio of 10:1, stirring evenly and removing bubbles, dropping the blend solution on the silver nanowire conductive film, and making it completely cover and evenly spread on the film, and leaving it for 24 h to cure into a film. Peeling the film from the substrate and turning it over, applying conductive silver paste to both ends of the silver nanowire conductive film on the upper surface to smear copper wires, and then pasting with a copper strip to fix it, and the electrode leads are completed to obtain a conductive heating layer.

[0059] Multi-layer composite: Spin-coating NOA81 on the conductive heating layer at a speed of 3000 rpm / min, placing the transparent shape memory polymer film on the spin-coated sample, and curing it under an ultraviolet lamp for 30 min to obtain a transparent electro-driven shape memory composite film.

[0060] Example 2

[0061] A preparation method of a transparent electro-driven shape memory composite film, comprising:

[0062] Preparation of shape memory polymer film: 4 g of acrylic acid, 5 g of 2-hydroxyethyl acrylate and 0.09 g of photoinitiator 1-hydroxycyclohexyl phenyl ketone were mixed and stirred evenly to obtain a precursor solution. The precursor solution was poured into a film mold and polymerized under 30 W ultraviolet light for 30 s to obtain a transparent shape memory polymer film.

[0063] Preparation of conductive heating layer: Cut a PET substrate of appropriate size. Use an airbrush to spray a silver nanowire-ethanol dispersion on the substrate on a 50 °C hot plate to obtain a silver nanowire conductive film with a resistance of 20 Ω / sq. Polydimethylsiloxane and a curing agent were mixed at a weight ratio of 10:1, stirred evenly and the bubbles were removed. The blend solution was dropped on the silver nanowire conductive film and completely covered and evenly spread on the film, and then placed in a 60 °C drying oven for 2 h to cure into a film. The film was peeled off from the substrate and turned over. Copper wires were coated with conductive silver paste at both ends of the silver nanowire conductive film on the upper surface, and then fixed with a copper strip to complete the electrode lead-out, obtaining a conductive heating layer.

[0064] Multilayer composite: NOA81 was spin-coated on the conductive heating layer at a speed of 3000 rpm / min. The transparent shape memory polymer film was placed on the spin-coated sample and cured under an ultraviolet lamp for 30 min to obtain a transparent electro-driven shape memory composite film.

[0065] Example 3

[0066] A preparation method of a transparent electro-driven shape memory composite film, comprising:

[0067] Preparation of shape memory polymer film: 4 g of acrylic acid, 6 g of 2-hydroxyethyl acrylate and 0.1 g of photoinitiator 1-hydroxycyclohexyl phenyl ketone were mixed and stirred evenly to obtain a precursor solution. The precursor solution was poured into a film mold and polymerized under 10 W ultraviolet light for 60 s to obtain a transparent shape memory polymer film.

[0068] Preparation of conductive heating layer: Cut a PET substrate of appropriate size. Use an airbrush to spray a silver nanowire-ethanol dispersion on the substrate on a 50 °C hot plate to obtain a silver nanowire conductive film with a resistance of 20 Ω / sq. A 10% aqueous solution of polyvinyl alcohol was prepared, stirred evenly and the bubbles were removed. The blend solution was dropped on the silver nanowire conductive film and completely covered and evenly spread on the film, and then placed in a 60 °C drying oven for 2 h to cure into a film. The film was peeled off from the substrate and turned over. Copper wires were coated with conductive silver paste at both ends of the silver nanowire conductive film on the upper surface, and then fixed with a copper strip to complete the electrode lead-out, obtaining a conductive heating layer.

[0069] Multi-layer composite: Spin-coat NOA63 on the conductive heating layer at a speed of 3000 rpm / min. Place the transparent shape memory polymer film on the spin-coated sample and cure it under an ultraviolet lamp for 30 min to obtain a transparent electro-driven shape memory composite film.

[0070] Example 4

[0071] A method for preparing a transparent electro-driven shape memory composite film, comprising:

[0072] Prepare a shape memory polymer film: Mix 3 g of acrylic acid, 6 g of 2-hydroxyethyl acrylate, and 0.09 g of photoinitiator 1-hydroxycyclohexyl phenyl ketone and stir evenly to obtain a precursor solution. Pour the precursor solution into a film mold and polymerize it under 20 W ultraviolet light for 45 s to obtain a transparent shape memory polymer film.

[0073] Prepare a conductive heating layer: Cut a PET substrate of appropriate size. Use an airbrush to spray a silver nanowire-ethanol dispersion on the substrate on a 50 °C heating plate to obtain a silver nanowire conductive film with a sheet resistance of 20 Ω / sq. Prepare a 10% polyvinylpyrrolidone ethanol solution, stir evenly and remove the bubbles. Drop the blend solution on the silver nanowire conductive film, and make it completely cover and evenly spread on the film. Put it in a 60 °C drying oven for 2 h to cure into a film. Peel the film from the substrate and turn it over. Apply conductive silver paste to the copper wires at both ends of the silver nanowire conductive film on the upper surface, and then paste it with a copper strip to fix it. The electrode leads are completed to obtain a conductive heating layer.

[0074] Multi-layer composite: Spin-coat NOA63 on the conductive heating layer at a speed of 3000 rpm / min. Place the transparent shape memory polymer film on the spin-coated sample and cure it under an ultraviolet lamp for 30 min to obtain a transparent electro-driven shape memory composite film.

[0075] Comparative Example 1

[0076] Basically the same as Example 1, the only difference being that the sheet resistance of the silver nanowire conductive film is 10 Ω / sq.

[0077] The sheet resistance of the silver nanowire conductive film used is too small. Although it can improve the conductivity of the electro-driven shape memory composite film, it will cause the transmittance of the electro-driven shape memory composite film to drop to 73%, limiting its application in fields with high transparency requirements (such as transparent functional substrates, etc.).

[0078] Comparative Example 2

[0079] Basically the same as Example 1, the only difference being that in the process of preparing the shape memory polymer film, the mass ratio of acrylic acid to acrylate monomer is 1.25:1.

[0080] Due to the excessively large mass ratio of acrylic acid to acrylate monomer, the glass transition temperature of the prepared shape memory polymer film is too high. The shape fixation rate of the prepared transparent electro-driven shape memory composite film can reach 100%, but under the condition of 9V direct current drive, it cannot reach the glass transition temperature of the shape memory polymer film, and electro-driven shape recovery cannot be carried out.

[0081] Comparative Example 3

[0082] It is basically the same as Example 1, except that: during the preparation of the shape memory polymer film, the mass ratio of acrylic acid to acrylate monomer is 0.25:1.

[0083] Due to the excessively large mass ratio of acrylic acid to acrylate monomer, the glass transition temperature of the prepared shape memory polymer film is too low, and it is in a soft state at room temperature (25°C). Although the programmed shape can be fixed after being cooled to a low temperature, the edited shape can spontaneously recover its shape at room temperature, so its applicability is not high.

[0084] The performance data of the transparent electro-driven shape memory composite films prepared in the examples and comparative examples of the present invention are shown in Table 1, and the test methods for each performance data are as follows:

[0085] Glass transition temperature: Measured by differential scanning calorimetry.

[0086] Shape memory performance: As Figure 2 , the transparent electro-driven shape memory composite film is subjected to shape editing (bending 180°C) and shape fixation, and its shape fixation rate is tested; then 9V direct current is applied to test its shape recovery rate and shape recovery time. It should be noted that during the test, the ambient temperature is 18°C.

[0087] Table 1. Performance of the transparent electro-driven shape memory composite films prepared in the examples and comparative examples of the present invention

[0088] Glass transition temperature Shape fixation rate Shape recovery rate Shape recovery time Example 1 60℃ 100％ 97.2％ 83s Example 2 55℃ 100％ 96.1％ 77s Example 3 50℃ 100％ 95.6％ 72s Example 4 44℃ 100％ 94.4％ 68s Comparative Example 3 15℃ 91.1％ 95％ 37s

[0089] As can be seen from Table 1, the present invention studies the performance of the electro-driven shape memory composite films (with a thickness of 1.4 mm) prepared in Examples 1-4 under different conditions, and finds that the electro-driven shape memory composite films prepared in each example have excellent shape memory performance (shape fixation rate of 100%, shape recovery rate of more than 94%), electro-driven heating performance and high light transmittance (up to more than 80%).

[0090] From Figure 3It can be seen that for the electro-driven shape memory composite film prepared in Example 1, at a voltage of 9V, the film can reach a high temperature of 80°C in 30s, and the temperature drops to room temperature after the power supply is disconnected 30s later. Its heating capacity is sufficient to meet the glass transition temperature of the shape memory polymer film prepared in Example 1. From Figure 4 It can be seen that when a 9V voltage is applied to the electro-driven shape memory composite film prepared in Example 1 and it is repeatedly turned on and off 50 times, it can still reach 80°C.

[0091] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A transparent electrically driven shape memory composite film, characterized in that: It comprises a shape memory polymer film, a conductive heating layer and an adhesive layer located between the shape memory polymer film and the conductive heating layer; the shape memory polymer film is obtained by photoinitiated polymerization of acrylic acid and acrylate monomers under the action of a photoinitiator; the mass ratio of acrylic acid to the acrylate monomer is 0.5 to 1:1; the conductive heating layer comprises a polymer matrix and a silver nanowire conductive film composited with the polymer matrix; The square resistance of the silver nanowire conductive film is 20-100Ω / sq; and electrodes are connected at both ends of the silver nanowire conductive film.

2. The transparent electrically driven shape memory composite film according to claim 1, characterized in that: The light transmittance of the shape memory polymer film is 90-95%; and / or The light transmittance of the transparent electrically driven shape memory composite film is 80-90%.

3. The transparent electrically driven shape memory composite film according to claim 1, characterized in that: The thickness of the shape memory polymer film is 300 to 1000 μm; The thickness of the adhesive layer is 50 to 100 μm; and / or The thickness of the conductive heating layer is 150-300 μm.

4. The transparent electrically driven shape memory composite film according to claim 1, characterized in that: The amount of the photoinitiator is no more than 2% of the total mass of the acrylic acid, acrylate monomer and photoinitiator, preferably 0.5-1%.

5. The transparent electrically driven shape memory composite film according to claim 1, characterized in that: The acrylate monomer is one or more of 2-hydroxyethyl acrylate, hydroxypropyl acrylate, hydroxyethyl methacrylate, and hydroxypropyl methacrylate; and / or The photoinitiator used in the photopolymerization is 1-hydroxycyclohexyl phenyl ketone.

6. The transparent electrically driven shape memory composite film according to claim 1, characterized in that: The photo-initiated polymerization is carried out under ultraviolet light irradiation, the power of the ultraviolet light is 10 to 30 W, and the ultraviolet light irradiation time is 30 to 60 seconds.

7. The transparent electrically driven shape memory composite film according to claim 1, characterized in that: The bonding layer is made of ultraviolet curing optical glue.

8. The transparent electrically driven shape memory composite film according to claim 1, characterized in that: The polymer matrix is ​​a transparent insulating polymer; the transparent insulating polymer is one or more of polyvinyl alcohol, polyvinyl pyrrolidone, and polydimethylsiloxane.

9. The transparent electrically driven shape memory composite film according to claim 1, characterized in that: The silver nanowire conductive film has a light transmittance of 80 to 90%; and / or The diameter of the silver nanowires in the silver nanowire conductive film is 30 to 50 nm, and the average length is 10 to 100 μm.

10. A method for preparing the transparent electrically driven shape memory composite film according to any one of claims 1 to 9, characterized in that: The preparation method comprises: Distributing a polymer solution on the surface of the silver nanowire conductive film, curing it to form a polymer matrix, and connecting electrodes at both ends of the silver nanowire conductive film to obtain a conductive heating layer; The conductive heating layer and the shape memory polymer film are bonded together via an adhesive layer to obtain an electrically driven shape memory composite film.

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