High-flexibility portable composite memory telescopic stand and preparation method thereof

Abstract

The application discloses a high-flexibility portable composite memory telescopic stand and a preparation method thereof. The application relates to the technical field of telescopic stands, and the telescopic stand comprises a stand body made of a fiber-reinforced resin matrix composite material, the fiber-reinforced resin matrix composite material comprises reinforcing fibers and a resin matrix, the reinforcing fibers comprise carbon fibers, the carbon fibers are provided with a modulus gradient interface layer on the surfaces, the modulus of the modulus gradient interface layer close to the side of the carbon fibers is 200 GPa to 250 GPa, and the modulus of the modulus gradient interface layer far from the side of the carbon fibers is 3 GPa to 8 GPa; the resin matrix contains an oxazolidinone ring structure unit; and the fiber lay-up of the stand body comprises 0° direction fiber layers and ±45° direction fiber layers. The preparation method comprises the steps of surface treatment of the carbon fibers to form the modulus gradient interface layer, compounding with the resin matrix to form a prepreg, and lay-up curing. The application solves the problems that the interface of the existing composite telescopic stand is prone to debonding and the rigidity of the telescopic stand attenuates quickly during repeated winding and unwinding.

Description

Technical Field

[0001] This invention relates to the field of telescopic pole technology, and more specifically to a highly flexible, portable composite material memory telescopic pole and its preparation method. Background Technology

[0002] Portable deployable poles are increasingly used in emergency communications, field observation, aerospace, and other fields. These poles need to occupy a small volume when folded for easy transport and carrying, while possessing sufficient rigidity and load-bearing capacity when deployed to support top loads such as antennas and sensors. Composite materials, due to their high specific strength, high specific stiffness, and good fatigue resistance, have become the preferred material for manufacturing portable deployable poles.

[0003] Existing deployable composite poles are primarily made of fiber-reinforced resin matrix composites. They are stored by being wound into a coil and automatically unfold upon release, relying on the material's elastic self-restoring properties. However, these poles face significant material-level durability issues during repeated winding and unfolding. During winding, the pole experiences substantial bending deformation in its thickness direction, generating significant interlaminar shear stress between the fiber layers. This shear stress concentrates at the fiber-resin matrix interface. Carbon fibers have a smooth surface and low chemical reactivity, resulting in weak physical and chemical interactions with the resin matrix. Under repeated shear stress, the fiber-resin matrix interface is prone to debonding, leading to interlaminar delamination and matrix cracking. With increasing use, these microscopic damages accumulate, causing a gradual decrease in the pole's bending stiffness and shape memory recovery rate, ultimately failing to meet usage requirements.

[0004] To address these issues, existing technologies have attempted surface oxidation or sizing treatments on carbon fibers to enhance the interfacial bond strength between the fiber and the resin matrix. However, excessively strong interfacial bonding prevents effective stress buffering at the interface, making cracks more prone to brittle propagation near the interface under shear stress, thus accelerating interfacial failure. Other technologies have explored adding toughening agents to the resin matrix to improve its toughness, but conventional toughening methods typically sacrifice the resin's rigidity and heat resistance, making it difficult to simultaneously meet the dual requirements of high rigidity and high toughness for the pole. Therefore, existing composite telescopic poles have not yet effectively solved the durability problem under repeated winding-unwinding conditions at the material level.

[0005] Therefore, it is necessary to propose a highly flexible portable composite material memory telescopic pole and its preparation method to solve the above problems. Summary of the Invention

[0006] The purpose of this invention is to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention specifically adopts the following technical solution:

[0008] A highly flexible portable composite material memory telescopic pole includes a pole body, which is made of fiber-reinforced resin matrix composite material and is in the shape of a hollow tube.

[0009] The fiber-reinforced resin matrix composite material comprises reinforcing fibers and a resin matrix. The reinforcing fibers include carbon fibers. A modulus gradient interface layer is disposed on the surface of the carbon fibers. The modulus of the modulus gradient interface layer decreases continuously from the side closer to the carbon fibers to the side farther away from the carbon fibers. The modulus of the modulus gradient interface layer on the side closer to the carbon fibers is 200 GPa to 250 GPa, and the modulus of the modulus gradient interface layer on the side farther away from the carbon fibers is 3 GPa to 8 GPa.

[0010] The resin matrix contains oxazolidinone ring structural units;

[0011] The fiber layup of the pole body includes a 0° direction fiber layer extending along the pole axis and a ±45° direction fiber layer extending at an angle relative to the pole axis.

[0012] In the above technical solution, the thickness of the modulus gradient interface layer is 100nm to 300nm.

[0013] In the above technical solution, the resin matrix is ​​an interpenetrating polymer network epoxy resin system, which comprises glycidyl ether epoxy resin and epoxy resin containing an oxazolidinone ring.

[0014] In the above technical solution, the mass percentage of the glycidyl type epoxy resin is 60% to 75%, and the mass percentage of the epoxy resin containing the oxazolidinone ring is 25% to 40%.

[0015] In the above technical solution, the reinforcing fiber also includes glass fiber, which is distributed in the inner and outer layers of the pole body wall, and the carbon fiber is distributed between the glass fiber layers.

[0016] In the above technical solution, the 0° direction fiber layer and the ±45° direction fiber layer are alternately stacked in the wall thickness direction of the pole body.

[0017] In the above technical solution, the cross-section of the pole body is a circular arc cross-section, and the central angle of the circular arc cross-section is 350° to 355°.

[0018] The method for preparing the highly flexible portable composite material memory telescopic pole of the present invention includes the following steps:

[0019] The carbon fiber is surface treated to form a modulus gradient interface layer on the surface of the carbon fiber. The modulus of the modulus gradient interface layer decreases continuously from the side closer to the carbon fiber to the side farther away from the carbon fiber. The modulus of the modulus gradient interface layer on the side closer to the carbon fiber is 200 GPa to 250 GPa, and the modulus of the modulus gradient interface layer on the side farther away from the carbon fiber is 3 GPa to 8 GPa.

[0020] Surface-treated carbon fibers are combined with a resin matrix containing oxazolidinone ring structural units to form a fiber-reinforced resin matrix composite prepreg.

[0021] The fiber-reinforced resin matrix composite prepreg is laid up according to a layup scheme including a fiber layer extending along the axial direction of the pole at 0° and a fiber layer extending at ±45° relative to the axial direction of the pole to form a pole body preform; when the reinforcing fiber also includes glass fiber, the glass fiber is combined with the resin matrix to form a prepreg, and then laid up together with the carbon fiber prepreg.

[0022] The prefabricated pole body is cured and molded to obtain a highly flexible, portable composite material memory telescopic pole.

[0023] In the above preparation method, the surface treatment of the carbon fiber is carried out by chemical vapor deposition. The carbon fiber is placed in a chemical vapor deposition reactor, and a mixture of carbon source gas and inert gas is introduced. The reaction is carried out at a temperature of 500°C to 600°C for 10 to 20 minutes.

[0024] In the above preparation method, the surface treatment of the carbon fiber adopts electrochemical polymerization, in which the carbon fiber is placed in an electrolyte containing conductive polymer monomers and electrochemical polymerization is carried out using the carbon fiber as the working electrode;

[0025] In the aforementioned layup scheme, the 0° direction fiber layer and the ±45° direction fiber layers are alternately stacked, with a total number of layers ranging from 9 to 14.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] This invention introduces a buffer region with a continuously decreasing modulus between the fiber and the resin matrix by setting a gradient interface layer with a modulus that decreases continuously from the inside to the outside on the carbon fiber surface. This interface layer absorbs and dissipates interlaminar shear strain energy during the rod winding process, reducing the stress peak at the fiber-resin matrix interface and thus inhibiting interface debonding. Simultaneously, the resin matrix containing oxazolidinone ring structural units achieves a balance of rigidity and toughness at the molecular level, dissipating energy through the movement of molecular chain segments without brittle fracture under large deformation. The synergistic effect of the modulus gradient interface layer and the toughened resin matrix effectively suppresses the initiation and propagation of microcracks during repeated winding-unwinding cycles, maintaining a high flexural stiffness retention rate and shape memory recovery. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the cross-sectional structure of the upright body laid flat in Embodiment 1 of the present invention;

[0029] Figure 2 This is a diagram showing the telescopic pole of the present invention in use. Detailed Implementation

[0030] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0031] Example 1

[0032] Example 1 provides a highly flexible, portable composite material memory telescopic pole and its manufacturing method. The pole in this example is suitable for 10-meter-class portable communication mast applications.

[0033] The pole body in this embodiment is made of fiber-reinforced resin matrix composite material and is in the form of a hollow tube. The total length of the pole body is 10.6m, and the effective unfolded height is 10m. The nominal diameter of the pole body is 101mm. The wall thickness of the pole body is 2.1mm. The cross-section of the pole body is a circular arc section with a central angle of 355°.

[0034] The fiber-reinforced resin matrix composite material of this embodiment comprises reinforcing fibers and a resin matrix. The reinforcing fibers include carbon fibers and glass fibers. The carbon fibers are T700 grade 12K carbon fibers. The glass fibers are E-glass glass fibers. The carbon fibers and glass fibers are alternately distributed in the wall thickness direction of the pole body.

[0035] A modulus gradient interface layer is formed on the surface of the carbon fiber. The modulus of the modulus gradient interface layer decreases continuously from the side closer to the carbon fiber to the side farther away. The modulus of the modulus gradient interface layer closer to the carbon fiber is 230 GPa. The modulus of the modulus gradient interface layer farther away from the carbon fiber is 5 GPa. The thickness of the modulus gradient interface layer is 150 nm. The decrease in modulus of the modulus gradient interface layer is achieved by gradually decreasing the carbon content along the thickness direction in the interface layer. The interface layer closer to the carbon fiber has a higher carbon content and a graphite-like structure, resulting in a higher modulus; the carbon content gradually decreases on the interface layer farther away from the carbon fiber, and the modulus gradually decreases to a level close to that of the resin matrix. This ensures that when stress is transferred from the high-modulus carbon fiber to the low-modulus resin matrix, there is a continuous transition in modulus, avoiding stress concentration at abrupt changes in modulus.

[0036] The resin matrix is ​​an interpenetrating polymer network epoxy resin system. This system consists of a glycidyl ether epoxy resin and an oxazolidinone ring-containing epoxy resin. The glycidyl ether epoxy resin is bisphenol A type. The oxazolidinone ring-containing epoxy resin is a glycidyl amine epoxy resin containing an oxazolidinone ring structure. The glycidyl ether epoxy resin accounts for 69% of the total mass. The oxazolidinone ring-containing epoxy resin accounts for 31% of the total mass. An anhydride curing agent and a latent accelerator are also added to this resin system. The anhydride curing agent is methylnadic anhydride, added at 90% of the total mass of the two epoxy resins. The latent accelerator is 2-ethyl-4-methylimidazole, added at 1.5% of the total mass of the two epoxy resins. Resin systems containing oxazolidinone ring structural units form an interpenetrating polymer network structure after curing. The oxazolidinone ring provides high rigidity, while the phase separation regions in the interpenetrating network structure provide energy dissipation channels, enabling the resin matrix to maintain a high glass transition temperature while exhibiting good toughness.

[0037] The fiber layup of the pole body includes a 0° fiber layer extending along the pole's axial direction and ±45° fiber layers extending at inclines relative to the pole's axial direction. The 0° and ±45° fiber layers are alternately stacked along the wall thickness direction of the pole body. Figure 1 As shown, the specific layering sequence is: glass fiber 0° layer, carbon fiber 0° layer, carbon fiber +45° layer, carbon fiber -45° layer, carbon fiber 0° layer, carbon fiber +45° layer, carbon fiber -45° layer, carbon fiber 0° layer, glass fiber 0° layer. The total number of layers is 9. The 0° direction refers to the direction along the axial direction of the upright, while the +45° and -45° directions refer to directions inclined at 45° to either side of the axial direction of the upright.

[0038] The preparation method of this embodiment includes the following steps:

[0039] Step 1: Surface treatment of the carbon fiber. T700 grade 12K carbon fiber is placed in a chemical vapor deposition (CVD) furnace. A mixture of acetylene and argon is introduced, with a flow rate ratio of 1:10. The reaction is carried out at 550°C for 15 minutes, depositing a modulus gradient interface layer on the carbon fiber surface. This modulus gradient interface layer has a thickness of 150 nm, and the modulus gradients from 230 GPa on one side of the carbon fiber to 5 GPa on the other side.

[0040] Step 2: Prepare the resin system. Mix bisphenol A type glycidyl ether epoxy resin and glycidyl amine type epoxy resin containing an oxazolidinone ring structure at a mass ratio of 69:31. Add methylnadic anhydride curing agent and 2-ethyl-4-methylimidazole accelerator. The amount of methylnadic anhydride added is 90% of the total mass of the two epoxy resins. The amount of 2-ethyl-4-methylimidazole added is 1.5% of the total mass of the two epoxy resins. Stir and mix at 60°C for 30 minutes, then perform vacuum degassing treatment for 15 minutes to obtain the resin mixture.

[0041] Step 3, fiber impregnation. The surface-treated carbon fibers and glass fibers are impregnated separately in the resin mixture obtained in Step 2 for 25 seconds, so that the resin content on the fiber surface is 21.5%.

[0042] Step 4, Layup and Curing. Lay up the fiberglass layer in the following sequence: glass fiber 0° layer, carbon fiber 0° layer, carbon fiber +45° layer, carbon fiber -45° layer, carbon fiber 0° layer, carbon fiber +45° layer, carbon fiber -45° layer, carbon fiber 0° layer, and glass fiber 0° layer, layer by layer, on the mandrel. After layup, place the mandrel in an autoclave. Pre-curing is performed at 120°C for 2 hours, followed by post-curing at 160°C for 3 hours. The heating rate should be controlled to no more than 2°C / min.

[0043] Step 5, Demolding and Post-processing. After the cured pole blank has cooled naturally to below 60℃, demold it. Remove the machining allowance from both ends of the pole blank and grind off the burrs to obtain a highly flexible, portable composite material memory telescopic pole.

[0044] The upright pole manufactured in this embodiment, after undergoing a winding-unwinding cycle test, maintained a bending stiffness retention rate of 96% after 1000 winding-unwinding cycles. The upright pole can be stored in a 205mm diameter storage cage while wound and automatically unfolds upon release.

[0045] In this embodiment, carbon fiber samples with a modulus gradient interface layer on the surface and a control sample without interface treatment were prepared. The interfacial shear strength was tested using a single fiber pull-out test. The sample with the modulus gradient interface layer showed an interfacial shear strength of 48 MPa, while the untreated sample showed 28 MPa. In cyclic shear loading tests, the sample with the modulus gradient interface layer maintained 92% of its interfacial shear strength after 1000 cycles, while the untreated sample's interfacial shear strength decreased to 60% of its initial value after 300 cycles. This demonstrates that the presence of a modulus gradient interface layer on the carbon fiber surface, with the modulus decreasing from the inside out, is a key feature that effectively suppresses interfacial debonding and improves cycle life. Simultaneously, resin samples containing oxazolidinone ring structural units and a control resin sample without oxazolidinone ring structural units were prepared. Through a three-point bending test, the sample containing oxazolidinone ring structural units showed a fracture toughness of 2.8 MPa·m¹ / ², while the control sample showed 1.2 MPa·m¹ / ², demonstrating that the inclusion of oxazolidinone ring structural units in the resin matrix significantly improves the toughness of the resin matrix.

[0046] In addition to chemical vapor deposition (CVD), electrochemical polymerization can also be used for the surface treatment of carbon fibers. The carbon fibers are placed in an electrolyte containing pyrrole monomers, with the carbon fiber as the working electrode and a platinum electrode as the counter electrode. Polymerization is carried out at a polymerization potential of 0.8V to 1.2V for 5 to 15 minutes, depositing a conductive polymer transition layer on the carbon fiber surface. Electrochemical polymerization can be performed at room temperature and has lower equipment costs, but the uniformity of the interface layer thickness is slightly worse than that of CVD. For the resin system mentioned above, in addition to bisphenol A glycidyl ether epoxy resin, bisphenol F glycidyl ether epoxy resin can also be used for glycidyl ether epoxy resin. When using the bisphenol F system, the viscosity of the resin mixture is lower, which is beneficial for fiber wetting, but the glass transition temperature after curing may be reduced by about 5°C to 8°C.

[0047] Example 2

[0048] Example 2 is an improvement on Example 1. The difference between this example and Example 1 lies in the dimensions and some material parameters of the mast, making it suitable for applications requiring rapid deployment of a 6-meter-class observation mast.

[0049] The total length of the pole body in this embodiment is 6.5m, and the unfolded effective height is 6m. The nominal diameter of the pole body is 76mm. The wall thickness of the pole body is 1.6mm. The cross-section of the pole body is a circular arc section with a central angle of 350°.

[0050] In this embodiment, the thickness of the modulus gradient interface layer on the carbon fiber surface is 120 nm. The modulus of the modulus gradient interface layer closer to the carbon fiber is 220 GPa. The modulus of the modulus gradient interface layer farther from the carbon fiber is 6 GPa.

[0051] In the resin system of this embodiment, the mass ratio of glycidyl ether epoxy resin to oxazolidinone-containing epoxy resin is 70:30. The amount of methylnadic anhydride added is 85% of the total mass of the two epoxy resins. The amount of 2-ethyl-4-methylimidazole added is 1.2% of the total mass of the two epoxy resins.

[0052] The preparation method of this embodiment includes the following steps:

[0053] Step 1: Surface treatment of the carbon fiber. The carbon fiber is placed in a chemical vapor deposition (CVD) furnace. A mixture of acetylene and argon is introduced, with a flow rate ratio of 1:8. The reaction is carried out at 520°C for 12 minutes, depositing a modulus gradient interface layer on the carbon fiber surface. This modulus gradient interface layer has a thickness of 120 nm, and the modulus gradients from 220 GPa on one side of the carbon fiber to 6 GPa on the other side.

[0054] Step 2: Prepare the resin system. Mix bisphenol A type glycidyl ether epoxy resin and glycidyl amine type epoxy resin containing an oxazolidinone ring structure at a mass ratio of 70:30. Add methylnadic anhydride curing agent and 2-ethyl-4-methylimidazole accelerator. The amount of methylnadic anhydride added is 85% of the total mass of the two epoxy resins. The amount of 2-ethyl-4-methylimidazole added is 1.2% of the total mass of the two epoxy resins. Stir and mix at 55°C for 25 minutes, then perform vacuum degassing treatment for 12 minutes to obtain the resin mixture.

[0055] Step 3, fiber impregnation. The surface-treated carbon fibers and glass fibers are impregnated separately in the resin mixture obtained in Step 2 for 22 seconds, so that the resin content on the fiber surface is 22%.

[0056] Step 4, Lamination and Curing. The layup scheme is the same as in Example 1. After layup, the mandrel is placed in an autoclave. Pre-curing is performed at 118°C for 1.8 hours, followed by post-curing at 158°C for 2.8 hours.

[0057] Step 5, Demolding and Post-processing. After the cured pole blank is cooled to below 60℃, it is demolded, the machining allowance at both ends of the pole blank is removed and the burrs are ground off to obtain a highly flexible portable composite material memory telescopic pole.

[0058] The pole manufactured in this embodiment, after undergoing a winding-unwinding cycle test, maintained a bending stiffness of 92% after 5000 winding-unwinding cycles.

[0059] In this embodiment, a sample with a modulus gradient interface layer thickness of 120 nm and a control sample with a thickness of 80 nm were prepared. The interface morphology after cyclic testing was observed by scanning electron microscopy. The interface layer of the 120 nm thick sample remained intact after 1000 cycles, while the interface layer of the 80 nm thick sample showed local cracking after 500 cycles.

[0060] For the resin system formulation in this embodiment, in addition to using a 70:30 mass ratio, a 65:35 mass ratio can also be used. When the proportion of epoxy resin containing an oxazolidinone ring is increased, the rigidity of the resin system increases, and the glass transition temperature can be raised by approximately 3°C to 5°C. However, the viscosity of the resin mixture increases accordingly, and the fiber impregnation time needs to be appropriately extended.

[0061] Example 3

[0062] Example 3 is an improvement on Example 1. The difference between this example and Example 1 is that the surface treatment of the carbon fiber uses electrochemical polymerization instead of chemical vapor deposition to reduce the preparation cost.

[0063] The specifications of the pole body in this embodiment are the same as those in Embodiment 1: total length 10.6m, nominal diameter 101mm, wall thickness 2.1mm, cross-section is a circular arc section, and the central angle is 355°.

[0064] The resin system in this embodiment is the same as that in Example 1.

[0065] The preparation method of this embodiment includes the following steps:

[0066] Step 1: Surface treatment of the carbon fiber. The carbon fiber is placed in an electrochemical reaction tank. The electrolyte contains pyrrole monomer and supporting electrolyte. The carbon fiber is used as the working electrode, and a platinum electrode is used as the counter electrode. Polymerization is carried out at a polymerization potential of 1.0V for 10 minutes, depositing a polypyrrole transition layer on the surface of the carbon fiber. The thickness of this transition layer is 150nm, and the modulus decreases gradually from one side of the carbon fiber to the outside.

[0067] Step two: Prepare the resin system. This is the same as step two in Example 1.

[0068] Step 3, fiber impregnation. Same as step 3 in Example 1.

[0069] Step four, lay-up and curing. Same as step four in Example 1.

[0070] Step 5, demolding and post-processing. Same as step 5 in Example 1.

[0071] The pole prepared in this embodiment was tested and found that after 1,000 winding-unwinding cycles, the bending stiffness retention rate was 93%, which is slightly lower than 96% in Example 1, but the preparation cost was reduced by about 50% compared with Example 1.

[0072] Scope of Protection Verification: In this embodiment, a polypyrrole modulus gradient interface layer was successfully prepared on the surface of carbon fiber using electrochemical polymerization. X-ray photoelectron spectroscopy analysis confirmed the gradient distribution of carbon and nitrogen content along the thickness direction in the interface layer, confirming the formation of the modulus gradient interface layer. This demonstrates that electrochemical polymerization, as an alternative to carbon fiber surface treatment, can achieve the preparation of modulus gradient interface layers.

[0073] In addition to using a pyrrole monomer system, an aniline monomer system can also be used for the above-mentioned electrochemical polymerization method. When using an aniline system, the polymerization potential is 0.7V to 1.0V, the conductivity of the interface layer is high, but the flexibility is slightly poor.

[0074] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. The scope of patent protection of the present invention shall be determined by the claims. Similarly, any equivalent structural changes made based on the content of the present invention's specification shall also be included within the scope of protection of the present invention.

Claims

1. A highly flexible, portable composite material memory telescopic pole, characterized in that, Includes a pole body, which is made of fiber-reinforced resin-based composite material and is in the form of a hollow tube; The fiber-reinforced resin matrix composite material comprises reinforcing fibers and a resin matrix. The reinforcing fibers include carbon fibers. A modulus gradient interface layer is disposed on the surface of the carbon fibers. The modulus of the modulus gradient interface layer decreases continuously from the side closer to the carbon fibers to the side farther away from the carbon fibers. The modulus of the modulus gradient interface layer on the side closer to the carbon fibers is 200 GPa to 250 GPa, and the modulus of the modulus gradient interface layer on the side farther away from the carbon fibers is 3 GPa to 8 GPa. The resin matrix contains oxazolidinone ring structural units; The fiber layup of the pole body includes a 0° direction fiber layer extending along the pole axis and a ±45° direction fiber layer extending at an angle relative to the pole axis.

2. The highly flexible portable composite material memory telescopic pole according to claim 1, characterized in that, The thickness of the modulus gradient interface layer is 100 nm to 300 nm.

3. The highly flexible portable composite material memory telescopic pole according to claim 1, characterized in that, The resin matrix is ​​an interpenetrating polymer network epoxy resin system, which comprises glycidyl ether epoxy resin and epoxy resin containing an oxazolidinone ring.

4. The highly flexible portable composite material memory telescopic pole according to claim 3, characterized in that, The glycidyl epoxy resin has a mass percentage of 60% to 75%, and the epoxy resin containing an oxazolidinone ring has a mass percentage of 25% to 40%.

5. The highly flexible portable composite material memory telescopic pole according to claim 1, characterized in that, The reinforcing fibers also include glass fibers, which are distributed in the inner and outer layers of the pole body wall, and the carbon fibers are distributed between the glass fiber layers.

6. The highly flexible portable composite material memory telescopic pole according to claim 1, characterized in that, The 0° direction fiber layer and the ±45° direction fiber layer are alternately stacked in the wall thickness direction of the pole body.

7. The highly flexible portable composite material memory telescopic pole according to claim 1, characterized in that, The cross-section of the pole body is a circular arc section, and the central angle of the circular arc section is 350° to 355°.

8. A method for preparing the highly flexible portable composite material memory telescopic pole according to any one of claims 1-7, characterized in that, Includes the following steps: The carbon fiber is surface treated to form a modulus gradient interface layer on the surface of the carbon fiber. The modulus of the modulus gradient interface layer decreases continuously from the side closer to the carbon fiber to the side farther away from the carbon fiber. The modulus of the modulus gradient interface layer on the side closer to the carbon fiber is 200 GPa to 250 GPa, and the modulus of the modulus gradient interface layer on the side farther away from the carbon fiber is 3 GPa to 8 GPa. Surface-treated carbon fibers are combined with a resin matrix containing oxazolidinone ring structural units to form a fiber-reinforced resin matrix composite prepreg. The fiber-reinforced resin matrix composite prepreg is laid up according to a layup scheme including a fiber layer extending along the axial direction of the pole at 0° and a fiber layer extending at ±45° relative to the axial direction of the pole to form a pole body preform; when the reinforcing fiber also includes glass fiber, the glass fiber is combined with the resin matrix to form a prepreg, and then laid up together with the carbon fiber prepreg. The prefabricated pole body is cured and molded to obtain a highly flexible, portable composite material memory telescopic pole.

9. The method for preparing the highly flexible portable composite material memory telescopic pole according to claim 8, characterized in that, The surface treatment of the carbon fiber is carried out by chemical vapor deposition. The carbon fiber is placed in a chemical vapor deposition reactor, and a mixture of carbon source gas and inert gas is introduced. The reaction is carried out at a temperature of 500°C to 600°C for 10 to 20 minutes.

10. The method for preparing the highly flexible portable composite material memory telescopic pole according to claim 8, characterized in that, The surface treatment of the carbon fiber is carried out by electrochemical polymerization, in which the carbon fiber is placed in an electrolyte containing conductive polymer monomers and electrochemical polymerization is performed using the carbon fiber as the working electrode. In the layup scheme, the 0° direction fiber layer and the ±45° direction fiber layer are stacked alternately, with a total number of layers ranging from 9 to 14.

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