Foldable unfolding supporting rod based on coupling of shape memory effect and pneumatic effect and preparation method of foldable unfolding supporting rod

Abstract

The invention discloses a shape memory effect and pneumatic effect coupling-based foldable unfolding support rod and a preparation method thereof, and belongs to the field of shape memory material preparation. The supporting rod comprises a shell, an inner container, an end cover and an air valve. The inner container is a cylindrical polyimide film inflation inner container of a sealed structure, end covers are installed on the two sides of the inner container and used for sealing, and an inflation opening is designed in the side face of the lower end cover and used for inflation unfolding and stable pressure maintaining of the supporting rod. And the shell is made of an epoxy resin-acrylate / reinforced fiber composite material and is used for realizing heating softening, flexible deformation and rigid support of the intelligent reinforced structure. The shape memory inflatable supporting rod has the advantages of being light in weight, simple, easy to control and high in stability. The shape memory inflatable supporting rod can directionally support various articles or drive a certain article to directionally move on the basis of the unfolding and automatic retraction capacities of the shape memory inflatable supporting rod, can be endowed with different temporary shapes according to the complexity of the use position, can be unfolded / retracted as required, and has the universal application capacity.

Description

Technical Field

[0001] The invention belongs to the field of shape memory material preparation, and in particular relates to a foldable and unfoldable support rod based on the coupling of shape memory effect and pneumatic effect and a preparation method thereof. Background Art

[0002] Smart materials are a new type of intelligent multifunctional material that can sense changes in the external environment and independently make judgments, processes, and respond appropriately. They are also the fourth generation of materials after natural materials, synthetic polymer materials, and artificially designed materials. Their rise has triggered a new revolution in materials science. At present, shape memory smart structural materials can be roughly divided into two categories, one is shape memory alloys made of various alloys such as titanium and nickel, and the other is shape memory polymers compounded with resin curing agents. Both types of shape memory materials have unique characteristics and play a huge role in aerospace, national defense, military industry, and microelectronic sensors.

[0003] Shape memory polymers have many advantages such as light weight, easy manufacturing, high shape deformation rate, and adjustable shape transition temperature. They have been proven to be used as active deformation structures in the fields of aviation and aerospace. However, the poor mechanical properties of shape memory polymer materials themselves limit their scope of application. Researchers have improved the performance of polymers by introducing fillers such as nanoparticles, carbon fibers, and glass fibers into shape memory polymers and have achieved a large number of experimental results. There are also some studies on composite shape memory alloy wires to improve the overall shape memory performance. However, there are few reports on the application of composite structures combining fibers and shape memory materials in the field of deformable support structures.

[0004] So far, the research on intelligent structural materials has attracted widespread attention. However, current research is often based on the performance of a single material to demonstrate the function of the structure. There are still few reports on how to effectively integrate multiple different intelligent features and design and prepare structures with high intelligence and strong controllability. Summary of the invention

[0005] The purpose of the present invention is to effectively integrate a variety of different intelligent features and provide a foldable and deployable support rod based on the coupling of shape memory and pneumatic action and a preparation method thereof. According to the actual needs of lightweight deployable structures, the present invention proposes to effectively integrate different intelligent features of materials (such as flexible / rigid convertible features, shape memory deformation features, etc.) and design a new type of intelligent enhanced structural material, which not only provides a technical solution for deployable nozzles, but is also expected to provide potential technical support in other devices.

[0006] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0007] A foldable and deployable support rod based on the coupling of shape memory effect and pneumatic effect, wherein the support rod comprises an outer shell, an inner liner, an end cap and an air valve;

[0008] The inner liner is a cylindrical polyimide film inflatable liner with a sealed structure. End caps are installed on both sides for sealing. An inflation port is designed on the side of the lower end cap for inflation and stable pressure maintenance of the support rod.

[0009] The outer shell is an epoxy resin-acrylate / reinforced fiber composite material, which is used to realize heating softening, flexible deformation and rigid support of the intelligent reinforced structure.

[0010] Furthermore, the reinforcing fiber is carbon fiber or aramid fiber.

[0011] A method for preparing the above-mentioned foldable and deployable support rod based on the coupling of shape memory effect and pneumatic effect, the method comprising:

[0012] Step 1: Preparation of the support rod liner: First, cut the polyimide film into the designed size, glue the wide side to the two end caps, and seal the long side by gluing;

[0013] Step 2: Preparation of shape memory composite material shell: 2-5g acrylate A, 0.2-0.6g acrylate B, 0.04g photoinitiator 2-2-dimethoxy-2-phenylacetophenone and 4-8g epoxy resin are placed in a container, heated to mix the reagents evenly, cooled to room temperature, 1-4g curing agent is added, and the mixture is heated in an oven to make the mixture thinner, and the resin mixture is poured on the surface of the reinforced fiber cloth according to the ratio of 60-80 mass% of the glue content, so that the resin is evenly coated on the fiber surface and the surface bubbles are removed; ultraviolet irradiation is performed, the composite fiber is turned over, and the back side is ultraviolet irradiated to make the resin react in the first stage to obtain a flexible composite material shell;

[0014] Step 3: Preparation of shape memory support rod: Wrap the flexible composite material shell obtained in step 2 around the outside of the support rod inner liner, shape the support rod, and heat it in an oven at 80°C for 2 hours to allow the resin in the composite material to undergo a second stage reaction. The composite material changes from flexible to rigid, and a shape memory support rod is obtained.

[0015] Step 4: During the support rod expansion process, first place the support rod in an oven and heat it at 80°C for 10 minutes, then take it out, bend the support rod and clamp the middle part with a butterfly clip, fix it in a "convex" shape and cool it down to give the support rod a temporary shape, as shown in the attached Figure 4 Then, 80℃ high temperature gas is introduced into the support rod, and under the combined effect of shape memory effect and gas pressure, the support rod returns to a vertical permanent state, as shown in the figure below. Figure 5 shown.

[0016] Furthermore, in step one, an end cap A bonding area, an end cap B bonding area, a side positive bonding area, and a side reverse bonding area are respectively arranged around the polyimide film for bonding during the molding of the liner; quick-adhesive glue is applied to the side reverse bonding area; after the side reverse bonding area is glued, the area is covered with a polyvinyl chloride sheet to prevent accidental bonding during operation; then quick-adhesive glue is applied to the end cap A bonding area, the end cap B bonding area and the side positive bonding area, twice with an interval of 20 minutes; after the glue coating of the liner film is completed, quick-adhesive glue is applied to the side of the end cap, twice with an interval of 20 minutes; after the end caps are glued, the end caps A and B are respectively bonded to the corresponding positions of the film, and then the positive and reverse bonding positions of the side of the film are bonded to finally obtain the inflatable liner finished product. The entire support rod was finally tested for air tightness. After 1440 minutes, the internal pressure of the support rod remained at a stable value without a significant decrease. Fig. 9 shown.

[0017] Further, in step 2, 2-5g of acrylate A, 0.2-0.6g of acrylate B, 0.04g of photoinitiator 2-2-dimethoxy-2-phenylacetophenone and 4-8g of epoxy resin are placed in a disposable plastic cup, placed in an oven and heated at 80°C for 5-20min to mix the reagents evenly, taken out and stirred with a glass rod and cooled to room temperature, 1-4g of curing agent is added, placed in an oven and heated at 80°C for 3-10min to make the mixed solution thinner for subsequent vacuum removal of bubbles, and the resin mixture is poured on the surface of the reinforcing fiber cloth with a length and width of 150mm and 52mm respectively according to the glue content of 60-80mass%, and the resin is evenly coated on the fiber surface to remove surface bubbles; then placed under a 365nm ultraviolet lamp at 50mW / cm 2 The composite fiber is turned over and the back side is irradiated for 5-15 minutes to make the resin undergo the first stage reaction and obtain a flexible composite material shell.

[0018] Furthermore, in step 2, the acrylate A is one of CN966, CN996, CN9021, CN9001, and CN9006; the acrylate B is one of SR399, CN8000, SR351, and SR350; the epoxy resin is one of E51, E44, and TDE85; and the curing agent is one of polyetheramine D-230, polyetheramine D400, and isophorone diamine.

[0019] Furthermore, in step three, the flexible composite shell is stacked up and down, and then sewn on one side with aramid thread; the prepared inflatable inner capsule is placed in the interlayer of the composite material, and then the other side of the composite material is sewn to wrap the inflatable inner capsule in the composite material; after sewing, scissors are used to cut off excess fibers on both sides of the composite material, and then polyimide tape is used to bond the sewing area to prevent damage to the sewing area.

[0020] Furthermore, in step two, after removing the bubbles on the surface, it also includes: cutting the self-made heating film of polyimide bonded with conductive threads to the corresponding size, adhering it to one side of the carbon fiber cloth with resin, and inserting two conductive thread heads from the polyimide film on the other side. After the support rod contains conductive threads, the specific regulation process is: use the power controller to adjust the current to 1A, and after the conductive threads are energized to the support rod for 5 minutes, the temperature of the composite material shell gradually rises to above 80°C, and then the support rod is taken out, bent, and the middle part is clamped with a butterfly clip, folded and cooled to fix it, giving the support rod a temporary shape. Then, the support rod is energized for 5 minutes, and then gas is introduced into the support rod. Under the combined effect of shape memory effect and air pressure, the support rod returns to a vertical permanent state, as shown in the attached figure. Figure 7 shown.

[0021] The beneficial effects of the present invention compared to the prior art are:

[0022] 1. The shape memory inflatable support rod prepared by the present invention has a tubular composite material composed of a polyimide film, a shape memory resin and fibers as the main material, and has the advantages of being light in weight, easy to operate and having strong stability.

[0023] 2. Based on its expansion and automatic retraction capabilities, the shape memory inflatable support rod can provide directional support for various items or drive an item to move in a directional manner. For example, when used on a deployable nozzle, it can achieve rapid and controllable expansion of the nozzle, and can give it different temporary shapes according to the complexity of the use position, so as to achieve on-demand expansion / retraction, and has good universal applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the expansion and contraction of the support rod;

[0025] Figure 2 It is a schematic diagram of the structure of the intelligent deformable support rod;

[0026] Figure 3 This is a schematic diagram of the design of the size of the inner capsule of the support rod;

[0027] Figure 4 Fold and secure the photo for the support rod;

[0028] Figure 5Photos of the inflation and deployment process of the shape memory support rod;

[0029] Figure 6 It is a schematic diagram of the structure of an intelligent deformable support rod with a heating wire;

[0030] Figure 7 Photos of the heating, inflating and deployment process of the shape memory support rod;

[0031] Figure 8 Photos of the shape memory support rod being heated, inflated, expanded, and heated, retracted;

[0032] Fig. 9 This is a test diagram of the pressure-maintaining performance of the shape memory support rod. DETAILED DESCRIPTION

[0033] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments, but is not limited thereto. Any modification or equivalent replacement of the technical solution of the present invention that does not depart from the spirit and scope of the technical solution of the present invention should be included in the protection scope of the present invention.

[0034] The shape memory effect of the shape memory support rod comes from the fact that the resin used is a shape memory resin. In the present invention, the resin polymer used has a cross-linked network structure, and the resin form after high temperature curing is the permanent form of the material. At this time, the polymer network conformation is in a thermodynamically stable state, and the material has a higher rigidity at room temperature. When the resin material is heated, the temperature is higher than its glass transition temperature, and the resin material changes from a glassy state to a rubbery state, the modulus of the entire material drops sharply, and the material becomes soft. At this time, under the action of external force, the shape of the material can be arbitrarily deformed. As the shape of the material changes, the polymer network conformation also changes accordingly. At this time, the polymer network conformation is in a thermodynamically metastable state. As the temperature decreases, the mobility of the molecular chain will decrease. When cooled to room temperature, the entire molecular chain will be locked again, so that the result reflected in the macroscopic shape is that the material memory maintains its temporary form. When the resin is heated again to above its glass transition temperature, the mobility of the polymer molecular chains is enhanced again. At this time, due to the principle of entropy increase, the polymer network will spontaneously transform from its metastable state to a thermodynamically stable state, and at the same time, its macroscopic morphology will show a spontaneous transformation from a temporary form to a permanent form.

[0035] The controllable expansion of the support rod relies on the shape memory property of the resin material. Figure 1As shown, the prepared support rod is in a folded shape and is in a rigid state at room temperature, so it can maintain a stable folded shape. When the intelligent enhanced structure needs to be unfolded, the support rod is heated to soften it, and then quickly inflated. Under the action of air pressure, the softened deformable composite material tube will be transformed into a vertical unfolded shape. When its temperature drops to room temperature in the inflated state, the support rod becomes rigid again and regains its supporting capacity. After heating again, the contraction is completed, realizing the reversible telescopic regulation of the intelligent enhanced structure.

[0036] Embodiment 1:

[0037] The shape memory support rod designed in this embodiment is composed of an outer shell, an inner liner, an end cap and an air valve. The inner layer is a resin film inflatable inner liner with a sealed structure, and end caps are installed on both sides for sealing. An inflation port is designed on the side of the lower end cap for inflation and stable pressure maintenance of the support rod. The outer layer is an epoxy resin-acrylate / aramid fiber composite material, which is used to achieve heating softening, flexible deformation and rigid support of the intelligent reinforced structure.

[0038] 1. Preparation of support rod liner, the film design of the liner is as shown in the attached Figure 3 As shown, the length is 150mm and the width is 62.8mm. The end cap A bonding area, the end cap B bonding area, the side positive bonding area, and the side reverse bonding area are set around for bonding during the liner molding. First, the polyimide film is cut to the design size, and then the quick-drying glue is applied to the side reverse bonding area. After the side reverse bonding area is glued, the area is covered with a polyvinyl chloride sheet to prevent accidental bonding during operation. Then, the end cap A bonding area, the end cap B bonding area and the side positive bonding area are coated with quick-drying glue twice, with an interval of 20 minutes. After the liner film is glued, the side of the end cap is coated with quick-drying glue twice, with an interval of 20 minutes. After the end cap is glued, the end caps A and B are bonded to the corresponding positions of the film respectively, and then the positive and negative bonding positions of the side of the film are bonded, and finally the inflatable liner is obtained.

[0039] 2. Preparation of shape memory composite shell. After the inner liner is made, the composite material of the support rod is further prepared. First, cut two pieces of the same aramid fiber with a length and width of 150mm and 52mm respectively, and use masking tape to bond them around to prevent the fiber from falling off. Take 3.6g acrylate CN966, 0.4g acrylate SR399, 0.04g photoinitiator 2-2-dimethoxy-2-phenylacetophenone and 6g epoxy resin E51 and put them in a disposable plastic cup. Put it in an oven and heat it at 80℃ for 10min to mix the reagents evenly. Take it out and stir it with a glass rod and cool it to room temperature. Add 2g curing agent polyetheramine D230, put it in an oven and heat it at 80℃ for 5min to make the mixture thinner to facilitate the subsequent vacuum removal of bubbles. Pour a certain amount of resin mixture on the surface of the fiber cloth, evenly coat the resin on the fiber surface, and remove surface bubbles. Then place it under a 365nm ultraviolet lamp at 50mW / cm 2 The composite fiber was turned over and irradiated on the back for 10 minutes to make the resin react in the first stage and obtain a flexible composite shell.

[0040] 3. Preparation of shape memory support rods. The two flexible composite shells are stacked up and down, and then sewed on one side with aramid thread. Place the prepared inflatable inner capsule in the interlayer of the composite material, sew the other side of the composite material, and wrap the inflatable inner capsule in the composite material. After suturing, use scissors to cut the excess fibers on both sides of the composite material, and then use polyimide tape to bond the sutured area to prevent damage to the sutured area. Finally, place it in an oven and heat it at 80°C for 2 hours to allow the resin in the composite material to undergo the second stage of reaction, and the composite material changes from flexible to rigid. After the reaction is complete, remove the tape and cut the composite material at the inflation port to finally obtain a rigid shape memory support rod.

[0041] 4. During the expansion process of the support rod, first put the support rod into an oven and heat it at 80℃ for 10 minutes, then take it out, bend the support rod and clamp the middle part with a butterfly clip, fix it in a "convex" shape and cool it down to give the support rod a temporary shape, as shown in the attached Figure 4 Then, 80℃ high temperature gas is introduced into the support rod, and under the combined effect of shape memory effect and gas pressure, the support rod returns to a vertical permanent state, as shown in the figure below. Figure 5 shown.

[0042] Embodiment 2:

[0043] The difference between this embodiment and embodiment 1 is that the composite material shell of the support rod is different. The shell material is selected to be carbon fiber and composited with heating wire, as shown in the attached Figure 6 As shown, the expansion process is also different.

[0044] 1. Preparation of shape memory composite shell. After the inner liner is made, first cut out a polyimide film and a carbon fiber cloth of 18 cm in length and 12.5 cm in width, and spread the polyimide film neatly under the cut fiber cloth, and use cloth tape to stick it on both sides of the fiber cloth to prevent the carbon fiber cloth from scattering, thereby maintaining the regularity of the carbon fiber cloth. Take 3.6g acrylate CN966, 0.4g acrylate SR399, 0.04g photoinitiator 2-2-dimethoxy-2-phenylacetophenone and 6g epoxy resin E51 and put them in a disposable plastic cup, put them in an oven and heat them at 80°C for 10min to mix the reagents evenly, take them out and stir them with a glass rod and cool them to room temperature, add 2g curing agent polyetheramine D230, put them in an oven and heat them at 80°C for 5min to make the mixed solution thinner for subsequent vacuum removal of bubbles, pour a certain amount of resin mixed solution on the surface of the fiber cloth, evenly coat the resin on the fiber surface, and remove surface bubbles. After that, the self-made polyimide heating film with conductive wires was cut to the corresponding size and adhered to one side of the carbon fiber cloth with resin, and the two conductive wire heads were inserted from the polyimide film on the other side (the heating wires were inserted into the polyimide film to avoid contact with the carbon fiber and cause a short circuit). Then, it was placed under a 365nm ultraviolet lamp at 50mW / cm 2 After irradiation for 10 min at an intensity of , a flexible composite material shell was obtained.

[0045] 2. Preparation of shape memory support rod: Wrap the prepared composite material shell on the prepared inflatable tube liner, and then sew one side of the gap with needle and thread. After suturing, cut off the excess part with scissors, and fix the bottom with a fixing ring and place it in an oven at 80°C for 2 hours to completely cure, and you can get a rigid support rod with shape memory properties.

[0046] 3. Use the power controller to adjust the current to 1A. After the conductive wire is powered on the support rod for 5 minutes, the temperature of the composite material shell gradually rises to above 80℃. Then take out the support rod, bend it and clamp the middle part with a butterfly clip. Fold it and cool it down to fix it, giving the support rod a temporary shape. Power the support rod for another 5 minutes, and then introduce gas into the support rod. Under the combined effect of shape memory effect and air pressure, the support rod returns to a permanent vertical state, as shown in the attached figure. Figure 7 shown.

[0047] Embodiment 3:

[0048] This embodiment is different from 2 in that the support rod has a permanent shape, so the support rod will automatically retract after being expanded under the effect of shape memory.

[0049] 1. Wrap the prepared composite material shell on the prepared inflatable tube liner, and then sew the bridged side with needle and thread. After suturing, cut off the excess part with scissors, bend the support rod and clamp the middle part with a butterfly clip, fix it in a folded shape, put it in an oven and heat it at 80°C for 2h, and you can get a shape memory support rod with a permanent shape in a contracted state.

[0050] 2. Use the power controller to adjust the current to 1A, and pass electricity to the support rod through the conductive wire for 5 minutes. Then, gas is introduced into the support rod. Under the combined effect of shape memory effect and air pressure, the support rod is extended to the unfolded state. Keep the current unchanged and remove the air pump. The support rod slowly retracts to the folded state under the effect of shape memory effect, as shown in the attached figure. Figure 8 shown.

Claims

1. A foldable and deployable support rod based on the coupling of shape memory effect and pneumatic effect, characterized in that: The support rod comprises an outer shell, an inner liner, an end cap and an air valve; The inner liner is a cylindrical polyimide film inflatable liner with a sealed structure. End caps are installed on both sides for sealing. An inflation port is designed on the side of the lower end cap for inflation and stable pressure maintenance of the support rod. The outer shell is an epoxy resin-acrylate / reinforced fiber composite material, which is used to realize heating softening, flexible deformation and rigid support of the intelligent reinforced structure.

2. The foldable and deployable support rod based on shape memory effect and pneumatic effect coupling according to claim 1, characterized in that: The reinforcing fibers are carbon fibers or aramid fibers.

3. A method for preparing a foldable and expandable support rod based on the coupling of shape memory effect and pneumatic effect according to claim 1 or 2, characterized in that: The method is: Step 1: Preparation of the support rod liner: First, cut the polyimide film into the designed size, glue the wide side to the two end caps, and seal the long side by gluing; Step 2: Preparation of shape memory composite material shell: 2-5g acrylate A, 0.2-0.6g acrylate B, 0.04g photoinitiator 2-2-dimethoxy-2-phenylacetophenone and 4-8g epoxy resin are placed in a container, heated to mix the reagents evenly, cooled to room temperature, 1-4g curing agent is added, and the mixture is heated in an oven to make the mixture thinner, and the resin mixture is poured on the surface of the reinforced fiber cloth according to the ratio of 60-80 mass% of the glue content, so that the resin is evenly coated on the fiber surface and the surface bubbles are removed; ultraviolet irradiation is performed, the composite fiber is turned over, and the back side is ultraviolet irradiated to make the resin react in the first stage to obtain a flexible composite material shell; Step 3: Preparation of shape memory support rod: Wrap the flexible composite material shell obtained in step 2 around the outside of the support rod inner liner, shape the support rod, and heat it in an oven at 80°C for 2 hours to allow the resin in the composite material to undergo a second stage reaction. The composite material changes from flexible to rigid, and a shape memory support rod is obtained.

4. The method for preparing a foldable and expandable support rod based on the coupling of shape memory effect and pneumatic effect according to claim 1, characterized in that: In step 1, the end cap A bonding area, the end cap B bonding area, the side positive bonding area, and the side reverse bonding area are respectively arranged around the polyimide film for bonding during the molding of the liner; Apply Quick-drying glue to the reverse bonding area on the side; After the glue coating of the reverse bonding area on the side is completed, cover the area with a polyvinyl chloride sheet to prevent accidental bonding during operation; then apply quick-drying glue to the bonding area of ​​the end cap A, the bonding area of ​​the end cap B and the positive bonding area on the side, apply it twice with an interval of 20 minutes; after the glue coating of the liner film is completed, apply quick-drying glue to the side of the end cap, apply it twice with an interval of 20 minutes; after the glue coating of the end cap is completed, bond the end caps A and B to the corresponding positions of the film respectively, and then bond the positive and negative bonding positions of the side of the film to finally obtain the inflatable liner product.

5. The method for preparing a foldable and deployable support rod based on the coupling of shape memory effect and pneumatic effect according to claim 1, characterized in that: In step 2, 2-5g of acrylate A, 0.2-0.6g of acrylate B, 0.04g of photoinitiator 2-2-dimethoxy-2-phenylacetophenone and 4-8g of epoxy resin are placed in a disposable plastic cup, placed in an oven and heated at 80°C for 5-20min to mix the reagents evenly, taken out and stirred with a glass rod and cooled to room temperature, 1-4g of curing agent is added, placed in an oven and heated at 80°C for 3-10min to make the mixed solution thinner for subsequent vacuum removal of bubbles, and the resin mixture is poured on the surface of a reinforced fiber cloth with a length and width of 150mm and 52mm respectively according to a glue content of 60-80mass%, and the resin is evenly coated on the fiber surface to remove surface bubbles; then placed under a 365nm ultraviolet lamp at 50mW / cm 2 The composite fiber is turned over and the back side is irradiated for 5-15 minutes to make the resin undergo the first stage reaction and obtain a flexible composite material shell.

6. The method for preparing a foldable and expandable support rod based on the coupling of shape memory effect and pneumatic effect according to claim 1 or 5, characterized in that: In step 2, the acrylate A is one of CN966, CN996, CN9021, CN9001, and CN9006; the acrylate B is one of SR399, CN8000, SR351, and SR350; the epoxy resin is one of E51, E44, and TDE85; and the curing agent is one of polyetheramine D-230, polyetheramine D400, and isophorone diamine.

7. The method for preparing a foldable and expandable support rod based on the coupling of shape memory effect and pneumatic effect according to claim 1, characterized in that: In step three, the flexible composite shell is stacked up and down, and then sewed on one side with aramid thread; the prepared inflatable inner capsule is placed in the interlayer of the composite material, and then the other side of the composite material is sewed to wrap the inflatable inner capsule in the composite material; after suturing, use scissors to cut off excess fibers on both sides of the composite material, and then use polyimide tape to bond the sutured area to prevent damage to the sutured area.

8. The method for preparing a foldable and deployable support rod based on the coupling of shape memory effect and pneumatic effect according to any one of claims 3 to 7, characterized in that: In step 2, after removing the surface bubbles, the process also includes: cutting the self-made polyimide heating film bonded with conductive threads to a corresponding size, adhering it to one side of the carbon fiber cloth with resin, and inserting two conductive thread heads through the polyimide film on the other side.

Images