Nylon elastomer composition as well as preparation method and application thereof

Abstract

The invention discloses a nylon elastomer composition as well as a preparation method and application thereof. The nylon elastomer composition is prepared from the following components in parts by mass: 60 to 65 parts of nylon 12 elastomer base material, 8 to 10 parts of surface sulfonation metal organic framework (MOF), 18 to 22 parts of hydroxylated polydimethylsiloxane (PDMS) microspheres, 6 to 8 parts of fluorinated carbon nanotubes, 3 to 4 parts of amino-fluorine amphiphilic nano-diamond and 2 to 3 parts of hydrogenated castor oil. The comprehensive performance of the nylon elastomer is remarkably improved through a three-stage synergistic mechanism, specifically, a surface sulfonation metal organic framework constructs a directional ion channel to achieve friction self-adaptive lubrication, amino-fluorine amphiphilic nano-diamond serves as a bridging agent to eliminate interface repulsion and evenly disperse stress, phase separation is inhibited through hydrogenated castor oil phase change, and friction self-adaptive lubrication is achieved; and by combining electrostatic field induced orientation and pulsed electric field driving, the elasticity and lubricity of the nylon elastomer are improved at the same time.

Description

Technical Field

[0001] This invention relates to the field of raw materials technology for medical interventional devices, and in particular to a nylon elastomer composition, its preparation method, and its application. Background Technology

[0002] With the development of minimally invasive surgical techniques, interventional devices such as medical catheters and guidewires face dual stringent requirements regarding the performance of their core materials: on the one hand, they must possess an ultra-low coefficient of friction to ensure smooth delivery within blood vessels; on the other hand, they must maintain a high elastic recovery rate to adapt to repeated deformations along tortuous anatomical pathways. Nylon elastomers, due to their combination of flexibility and biocompatibility, have become an ideal substrate, but their inherent properties make it difficult to simultaneously optimize lubricity and elasticity, becoming a key bottleneck restricting device performance.

[0003] Current improvements to nylon elastomer compositions have the following limitations: While adding liquid lubricants can reduce the initial coefficient of friction, the explosive release leads to insufficient long-term performance, high coefficient of friction over 10,000 cycles, low lubricity and stability, and excessive lubricating phase encapsulating molecular chains damages the elastic network; Introducing nano-reinforcers (such as carbon nanotubes) can improve strength, but their interfacial repulsion with organic lubricating components (such as PDMS) causes phase separation, resulting in stress concentration and elasticity loss; Traditional melt blending processes cannot precisely control nano-dispersion and orientation, and phase separation and uneven distribution of functional components further deteriorate the overall performance.

[0004] To address the aforementioned contradictions, there is an urgent need to develop a nylon elastomer composition that simultaneously improves lubricity and elasticity. Summary of the Invention

[0005] In view of this, this application provides a nylon elastomer composition, its preparation method and application, to solve the problem of how to simultaneously improve the elasticity and lubricity of nylon elastomers.

[0006] To achieve the above technical objectives, this application adopts the following technical solution: In a first aspect, this application provides a nylon elastomer composition comprising the following components in parts by weight: 60-65 parts of nylon 12 elastomer base material, 8-10 parts of surface sulfonated metal-organic framework (MOF), 18-22 parts of hydroxylated polydimethylsiloxane (PDMS) microspheres, 6-8 parts of fluorinated carbon nanotubes, 3-4 parts of amino-fluorine amphiphilic nanodiamonds, and 2-3 parts of hydrogenated castor oil.

[0007] Preferably, the fluorosilane in the amino-fluorine amphiphilic nanodiamond is tridecafluorooctyltriethoxysilane, and the fluorosilane coverage is 60-70%.

[0008] Preferably, the surface charge density of the surface sulfonated metal-organic framework (MOF) is 0.8-1.0 C / m².

[0009] Secondly, this application provides a method for preparing a nylon elastomer composition, comprising the following steps: S1. Immerse zeolite imidazole ester framework material-8 (ZIF-8) in sodium styrene sulfonate ethanol solution and heat to 80-100℃ to obtain surface sulfonated metal-organic framework (MOF). S2. Nylon 12 elastomer base material and hydrogenated castor oil are melt-blended, and then surface sulfonated MOF and hydroxylated polydimethylsiloxane (PDMS) microspheres are added. The mixture is then sheared and extruded under electrostatic field conditions to obtain the extruded material. S3. Inject an amino-fluorine amphiphilic nanodiamond / supercritical carbon dioxide (ND-SiF / supercritical CO2) suspension into the extruder, then apply a pulsed electric field and quench it with liquid nitrogen to obtain the composition.

[0010] Preferably, the electrostatic field strength is 3-5kV / mm, and the angle between the direction of the electrostatic field and the extrusion channel is ≤5°.

[0011] Preferably, the pulse electric field strength is 3-5kV / mm, the frequency is 5-10Hz, and the power-on / power-off duration is 0.05s / 0.95s.

[0012] Preferably, the concentration of amino-fluorine amphiphilic nanodiamond (ND-SiF) in the supercritical carbon dioxide suspension is 5-8 wt%, and the suspension injection temperature is 160℃.

[0013] Preferably, the cooling rate of liquid nitrogen quenching is ≥100℃ / s, and the quenching termination temperature is -40℃ to -30℃.

[0014] Preferably, the injection pressure of the supercritical carbon dioxide suspension is 10±0.5MPa, and the supercritical state is maintained until the pulsed electric field is applied.

[0015] Thirdly, this application provides the use of a nylon elastomer composition in medical catheters or guidewires.

[0016] The beneficial effects of this application are as follows: This application significantly improves the comprehensive performance of nylon elastomers through a three-level synergistic mechanism: the surface sulfonated metal-organic framework constructs directional ion channels to achieve frictional adaptive lubrication; amino-fluorine amphiphilic nanodiamonds act as bridging agents to eliminate interfacial repulsion and uniformly disperse stress; hydrogenated castor oil phase change is used to inhibit phase separation; and combined with electrostatic field-induced orientation and pulsed electric field drive, the elasticity and lubricity of nylon elastomers are improved simultaneously. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0018] In a first aspect, this application provides a nylon elastomer composition comprising the following components in parts by weight: 60-65 parts of nylon 12 elastomer base material, 8-10 parts of surface sulfonated metal-organic framework (MOF), 18-22 parts of hydroxylated polydimethylsiloxane (PDMS) microspheres, 6-8 parts of fluorinated carbon nanotubes, 3-4 parts of amino-fluorine amphiphilic nanodiamonds, and 2-3 parts of hydrogenated castor oil.

[0019] In this application, the functions of each component are as follows: As a continuous phase matrix, nylon 12 elastomer matrix material has amino groups at the ends of its molecular chains anchoring MOF sulfonic acid groups, ensuring the directional stability of MOF in an electric field and avoiding lubrication failure caused by ion channel disorder. Its high viscosity in the molten state promotes uniform dispersion of components, eliminates the damage to the elastic network caused by local stress concentration caused by agglomeration, and the melting temperature window of nylon 12 elastomer matrix material matches the phase transition of hydrogenated castor oil, which can achieve uniform dispersion at low temperature and stable structure at high temperature, providing a basis for high elastic recovery.

[0020] Surface sulfonated MOFs impart electric field responsiveness through the physical adsorption of sulfonate groups. Under the drive of an electrostatic field, the crystals are oriented to form ion channels, which transforms the explosive release of ionic liquids into a gradual release. This solves the problem of the friction coefficient soaring due to insufficient lubrication durability, while avoiding the additional load on the elastic structure caused by the increased conduit pushing resistance due to lubrication failure.

[0021] Hydroxylated PDMS microspheres migrate to the material surface to form a lubricating molecular brush, which directly reduces interfacial friction resistance. The hydroxyl groups are bonded to ND-SiF amino groups, which can inhibit the excessive migration of PDMS from damaging the elastic network and prevent elastic loss caused by excessive enrichment of the lubricating phase.

[0022] Fluorination of the surface of fluorinated carbon nanotubes can reduce the surface energy of the material. It can form a three-dimensional elastic reinforcement network by intercalation with ND-SiF through van der Waals forces. This network significantly improves creep resistance, but it depends on ND-SiF bridging to coordinate the interfacial compatibility with PDMS and avoid phase separation due to surface energy differences, which would damage the elastic recovery ability.

[0023] Amino-fluorine amphiphilic nanodiamond (ND-SiF) serves as the core bridging agent, resolving the conflict between lubricity and elasticity. Its amino-terminal bonded PDMS hydroxyl groups allow for control of the molecular brush thickness within the functional range to ensure lubrication efficiency. The rigid diamond core uniformly disperses the load, enabling the material to maintain a high elastic recovery rate under ultra-low friction coefficients.

[0024] Hydrogenated castor oil reduces the agglomeration potential energy of nanoparticles in the molten state, improving dispersion uniformity to ensure the integrity of the elastic network. In the crystalline state, it locks the particle positions through a hydroxyl hydrogen bond network, preventing uneven lubrication and elasticity decay caused by phase separation.

[0025] In some embodiments, the fluorosilane in the amino-fluorine amphiphilic nanodiamond is tridecafluorooctyltriethoxysilane, and the fluorosilane coverage is 60-70%.

[0026] In this embodiment, insufficient coverage weakens interfacial bonding, leading to elastic network breakage; excessive coverage weakens the inhibition of PDMS migration by amino masking, resulting in lubrication failure and decreased elasticity.

[0027] In some embodiments, the ionic liquid loading of the surface sulfonated metal-organic framework (MOF) is 1.5-2.0 mmol / g, the ionic liquid is 1-butyl-3-methylimidazolium tetrafluoroborate ([BMIM][BF4]), and the surface charge density is 0.8-1.0 C / m².

[0028] In this embodiment, the lower limit of surface charge density ensures the directional alignment of ion channels to achieve long-term lubrication and avoids a surge in the coefficient of friction caused by disordered distribution; the upper limit of surface charge density balances ion loading and material stability, preventing excessive sulfonic acid groups from catalyzing nylon hydrolysis, which would lead to a decrease in mechanical strength and damage to elasticity.

[0029] This application provides a method for preparing a nylon elastomer composition, comprising the following steps: S1. Immerse the zeolite imidazole ester framework material-8 (ZIF-8) in a sodium styrene sulfonate ethanol solution and heat at 80-100℃ for 2-3 hours to obtain a surface sulfonated metal-organic framework (MOF). S2. Nylon 12 elastomer base material and hydrogenated castor oil are melt-blended, and then surface sulfonated MOF and hydroxylated polydimethylsiloxane (PDMS) microspheres are added. The mixture is then sheared and extruded under electrostatic field conditions to obtain the extruded material. S3. Inject an amino-fluorine amphiphilic nanodiamond / supercritical carbon dioxide (ND-SiF / supercritical CO2) suspension into the extruder, then apply a pulsed electric field and quench it with liquid nitrogen to obtain the composition.

[0030] In this application, step S1 is the MOF sulfonation process, where heating to 80-100℃ causes sodium styrene sulfonate to be adsorbed onto the MOF surface through π-π stacking. This temperature range introduces sulfonic acid groups while preventing framework collapse, ensuring subsequent electric field orientation and ion slow-release stability, thus providing a foundation for long-lasting lubrication. Step S2 is a dual-field synergistic extrusion process, where nylon 12 base material and hydrogenated castor oil are melt-blended at 160-180℃. An electrostatic field drives the MOF crystals to oriented and align, constructing ordered ion channels to prolong lubrication durability. Shear force expands the MOF interlayer spacing to optimize ion diffusion paths. The two processes work together to prevent ion burst release from damaging the elastic structure. Impact; Step S3 is the bridging network construction and structural locking process, which is implemented in three stages: The first stage is supercritical dispersion, in which a supercritical carbon dioxide suspension of amino-fluorine amphiphilic nanodiamond (ND-SiF) is injected into the extruder. The supercritical dispersion depolymerizes the ND-SiF agglomerates, creating conditions for uniform bridging to coordinate lubrication and elasticity; the pulsed electric field activates the directional migration of ND-SiF to the interface, and simultaneously bonds PDMS hydroxyl groups and carbon nanotube fluorine layers to form a "molecular rivet" structure to simultaneously improve lubrication efficiency and stress transmission capability; rapid quenching freezes and solidifies the functional structure to prevent lubrication failure and elasticity decay caused by structural relaxation.

[0031] In some embodiments, the electrostatic field strength is 3-5 kV / mm, and the angle between the electrostatic field direction and the extrusion channel is ≤5°.

[0032] In this embodiment, an angle deviation exceeding 5° leads to MOF orientation disorder, ion channel distortion causes uneven lubrication and fluctuations in pushing resistance, and stress distribution imbalance impairs elastic recovery rate.

[0033] In some embodiments, the pulse electric field strength is 3-5 kV / mm, the frequency is 5-10 Hz, and the power-on / power-off duration is 0.05 s / 0.95 s.

[0034] In this embodiment, insufficient frequency reduces the bridging rate and weakens elasticity, while excessive frequency causes local overheating, leading to PDMS degradation and impairing lubricity.

[0035] In some embodiments, the concentration of amino-fluorine amphiphilic nanodiamond (ND-SiF) in the supercritical carbon dioxide suspension is 5-8 wt%, and the suspension injection temperature is 160°C.

[0036] In this embodiment, excessively high ND-SiF concentration leads to increased viscosity, hindering dispersion, while excessively low concentration results in insufficient bridging point density; 160℃ precisely corresponds to the viscosity inflection point of the nylon matrix in the molten state, ensuring the supercritical fluid permeation efficiency.

[0037] In some embodiments, the cooling rate of liquid nitrogen quenching is ≥100°C / s, and the quenching termination temperature is -40°C to -30°C.

[0038] In this embodiment, the ultra-fast cooling freezes the functional structure to prevent lubrication failure caused by MOF orientation shift due to molecular chain relaxation, and to prevent elasticity reduction caused by bridging network regression.

[0039] In some embodiments, the injection pressure of the supercritical carbon dioxide suspension is 10 ± 0.5 MPa, and the supercritical state is maintained until the pulsed electric field is applied.

[0040] In this embodiment, 9.5 MPa ensures complete wetting and dispersion of ND-SiF to maintain bridging efficiency; insufficient pressure leads to agglomeration and reduced elasticity; excessive pressure damages the PDMS structure and affects lubrication uniformity.

[0041] This application provides the use of a nylon elastomer composition in medical catheters or guidewires.

[0042] Raw material source: Nylon 12 elastomer base material: purchased from Evonik, L1801; Surface sulfonated MOF: 1 g ZIF-8 was dispersed in 20 mL of 5 wt% sodium styrene sulfonate ethanol solution, magnetically stirred at 85 °C for 2 hours, centrifuged, washed 3 times with ethanol, and vacuum dried at 60 °C for 12 hours. XPS analysis showed that the S element content was 3.3 at%, resulting in a surface sulfonated MOF with a charge density of 0.9 C / m². Hydroxylated PDMS microspheres: Shin-Etsu Chemical, X-52-874; Fluorinated carbon nanotubes: Nanolab, FL-CNT-10; Amino-fluorine amphiphilic nanodiamonds: 1g of nanodiamonds were mixed with 50mL of 3-aminopropyltriethoxysilane and refluxed at 80℃ for 6 hours to obtain amination-treated diamonds. Then, the amination-treated diamonds were mixed with tridecafluorooctyltriethoxysilane at a molar ratio of 1:1, with toluene as the solvent, and reacted at 110℃ for 12 hours to obtain amino-fluorine amphiphilic nanodiamonds with 70% fluorosilane coverage.

[0043] Hydrogenated castor oil: Heda.

[0044] The following specific embodiments further illustrate this solution.

[0045] Example 1 A nylon elastomer composition comprising the following components in parts by weight: 63 parts nylon 12 elastomer base material, 9 parts surface sulfonated metal-organic framework (MOF), 20 parts hydroxylated polydimethylsiloxane (PDMS) microspheres, 7 parts fluorinated carbon nanotubes, 3.5 parts amino-fluorine amphiphilic nanodiamonds, and 2.5 parts hydrogenated castor oil.

[0046] A method for preparing a nylon elastomer composition includes the following steps: S1. Disperse 1g ZIF-8 in 20mL of 5wt% sodium styrene sulfonate ethanol solution, stir magnetically at 85℃ for 2 hours, centrifuge, wash 3 times with ethanol, vacuum dry at 60℃ for 12h, and XPS detects S element content of 3.3 at%, to obtain surface sulfonated MOF with charge density of 0.9C / m². S2. Nylon 12 base material and hydrogenated castor oil are added to a twin-screw extruder. The temperature zones are set as follows: 1-2 zones 160℃, 3-4 zones 180℃, and 5-6 zones 190℃. MOF and PDMS microspheres are added in zone 4 according to the mass fraction. The extrusion is sheared under an electrostatic field to obtain the extruded material. The electrostatic field is 4 kV / mm, and its direction is at an angle of 3° with the flow channel. The screw speed in the shear field is 300 rpm, and the shear rate is 6000 s⁻¹. S3. ND-SiF was dispersed in supercritical CO2 at a pressure of 10 MPa, a temperature of 160℃, and a concentration of 6.5 wt% to obtain an amino-fluorine amphiphilic nanodiamond / supercritical carbon dioxide suspension. The amino-fluorine amphiphilic nanodiamond / supercritical carbon dioxide suspension was injected into the extruder, and then a pulsed electric field was applied with a pulsed electric field of 4 kV / mm and a frequency of 8 Hz, with an on / off ratio of 0.05s / 0.95s. The mixture was then quenched with liquid nitrogen at a cooling rate of 120℃ / s and a termination temperature of -35℃ to obtain the composition.

[0047] Example 2 A nylon elastomer composition, otherwise identical to Example 1, except that the ND-SiF coverage is 50%.

[0048] Example 3 A nylon elastomer composition, otherwise identical to that of Example 1, except that the supercritical pressure is 8 MPa.

[0049] Example 4 A nylon elastomer composition, otherwise identical to that of Example 1, except that the charge density of the surface sulfonated metal-organic framework is 0.6 C / m².

[0050] Comparative Example 1 A nylon elastomer composition, otherwise identical to that of Example 1, except that it does not include amino-fluorine amphiphilic nanodiamonds.

[0051] Comparative Example 2 A nylon elastomer composition, otherwise identical to Example 1, except that the surface sulfonated MOF is replaced with ZIF-8.

[0052] Comparative Example 3 A nylon elastomer composition is otherwise identical to that of Example 1, except that fluorinated carbon nanotubes are replaced with non-fluorinated carbon nanotubes.

[0053] Comparative Example 4 A nylon elastomer composition, otherwise identical to Example 1, except that hydrogenated castor oil is replaced with paraffin.

[0054] Comparative Example 5 A nylon elastomer composition, otherwise identical to that of Example 1, except that an electrostatic field is not applied during the preparation process.

[0055] Comparative Example 6 A nylon elastomer composition is otherwise identical to that of Example 1, except that ND-SiF is directly injected into the extrudate during the preparation process.

[0056] Comparative Example 7 A nylon elastomer composition, otherwise identical to Example 1, except that the application of a pulsed electric field is not included in the preparation process.

[0057] Testing and Evaluation The coefficient of friction and elastic recovery rate of nylon elastomer compositions obtained from different embodiments and comparative examples were tested, and the results are shown in Table 1. The coefficient of friction was determined according to an improved version of ASTM G133-05 (2016) standard, using a ball-disc reciprocating friction test (GCr15 bearing steel ball Φ6.35mm, load 1N, frequency 2Hz, stroke 10mm), recording the stable coefficient of friction after 10,000 consecutive cycles. The elastic recovery rate was determined according to ASTM D412-16 standard, measuring the instantaneous recovery rate of the sample after being stretched to 100% strain (23±2℃, 50%RH).

[0058] Table 1 Test Results

[0059] Compared to Example 1, Example 2 showed a decrease in the coverage of amino-fluorine amphiphilic nanodiamonds, leading to an increase in the coefficient of friction and a decrease in the elastic recovery rate. This was because insufficient coverage caused discontinuity in the fluorine layer, weakened interfacial bonding, and resulted in the breakage of the elastic network. At the same time, insufficient amino shielding failed to suppress excessive migration of PDMS. In Example 3, the decrease in supercritical pressure led to an increase in the coefficient of friction and a decrease in the elastic recovery rate. This was because insufficient pressure caused ND-SiF agglomeration, and the decrease in bridging point density caused local stress concentration. In Example 4, the decrease in MOF charge density led to an increase in the coefficient of friction and a decrease in the elastic recovery rate. This was because insufficient charge density caused ion channel disorder, and the release of lubricant bursts caused a surge in the coefficient of friction. At the same time, the pushing resistance fluctuations damaged the elastic network.

[0060] Compared to Example 1, Comparative Example 1 lacked amino-fluorine amphiphilic nanodiamonds, resulting in an increased coefficient of friction and a decreased elastic recovery rate. This was because the interfacial repulsion between PDMS and carbon nanotubes caused molecular brush runaway, leading to stress concentration and damage to the elastic network. Comparative Example 2 used unmodified ZIF-8 instead of sulfonated MOF, resulting in an increased coefficient of friction and a decreased elastic recovery rate. This was because the unsulfonated MOF could not form electric field-responsive ion channels, resulting in a complete lack of lubrication. Comparative Example 3 used unfluorinated carbon nanotubes, resulting in an increased coefficient of friction and a decreased elastic recovery rate. This was because the increased surface energy hindered ND-SiF intercalation, and the defects in the three-dimensional elastic network weakened creep resistance. Comparative Example 4 replaced hydrogenated castor oil with paraffin wax, resulting in increased friction... The increase in friction coefficient and decrease in elastic recovery rate in Comparative Example 5 is due to the loss of melt-crystallization control function and the aggravation of phase separation, which damages the uniformity of nano-dispersion. In Comparative Example 6, no electrostatic field was applied, resulting in an increase in friction coefficient and decrease in elastic recovery rate. This is because the disordered orientation of MOF caused ion channel distortion, uneven lubrication, and unbalanced stress distribution. In Comparative Example 7, no pulsed electric field was applied, resulting in an increase in friction coefficient and decrease in elastic recovery rate. This is because insufficient migration of ND-SiF and the failure of molecular rivet structure weaken the stress transfer efficiency.

[0061] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A nylon elastomer composition, characterized in that, The composition includes the following components in parts by weight: 60-65 parts nylon 12 elastomer base material, 8-10 parts surface sulfonated metal-organic framework (MOF), 18-22 parts hydroxylated polydimethylsiloxane (PDMS) microspheres, 6-8 parts fluorinated carbon nanotubes, 3-4 parts amino-fluorine amphiphilic nanodiamonds, and 2-3 parts hydrogenated castor oil.

2. The nylon elastomer composition according to claim 1, characterized in that, The fluorosilane in the amino-fluorine amphiphilic nanodiamond is tridecafluorooctyltriethoxysilane, and the fluorosilane coverage is 60-70%.

3. The nylon elastomer composition according to claim 1, characterized in that, The surface charge density of the surface sulfonated metal-organic framework (MOF) is 0.8-1.0 C / m².

4. A method for preparing a nylon elastomer composition according to any one of claims 1-3, characterized in that, Includes the following steps: S1. Immerse zeolite imidazole ester framework material-8 (ZIF-8) in sodium styrene sulfonate ethanol solution and heat to 80-100℃ to obtain surface sulfonated metal-organic framework (MOF). S2. Nylon 12 elastomer base material and hydrogenated castor oil are melt-blended, and then the surface sulfonated MOF and hydroxylated polydimethylsiloxane (PDMS) microspheres are added. The mixture is then sheared and extruded under electrostatic field conditions to obtain the extruded material. S3. Inject an amino-fluorine amphiphilic nanodiamond / supercritical carbon dioxide (ND-SiF / supercritical CO2) suspension into the extruder, then apply a pulsed electric field and quench it with liquid nitrogen to obtain the composition.

5. The preparation method according to claim 4, characterized in that, The electrostatic field strength is 3-5kV / mm, and the angle between the electrostatic field direction and the extrusion channel is ≤5°.

6. The preparation method according to claim 4, characterized in that, The pulsed electric field strength is 3-5kV / mm, the frequency is 5-10Hz, and the power-on / power-off duration is 0.05s / 0.95s.

7. The preparation method according to claim 4, characterized in that, The concentration of amino-fluorine amphiphilic nanodiamond (ND-SiF) in the supercritical carbon dioxide suspension is 5-8 wt%, and the suspension injection temperature is 160℃.

8. The preparation method according to claim 4, characterized in that, The cooling rate of the liquid nitrogen quenching is ≥100℃ / s, and the quenching termination temperature is -40℃ to -30℃.

9. The preparation method according to claim 4, characterized in that, The supercritical carbon dioxide suspension is injected at a pressure of 10 ± 0.5 MPa and is maintained in a supercritical state until the pulsed electric field is applied.

10. The use of a nylon elastomer composition as described in any one of claims 1-3 in a medical catheter or guidewire.

Images