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Method for preparing shape memory polymer device with complex permanent shape by utilizing secondary crosslinking and application of shape memory polymer device

A polymer device and secondary cross-linking technology, applied in prosthetics, medical science, etc., can solve the problems of increasing material processing costs, permanent shape can no longer be changed, and reducing the complexity of permanent shape of polymer materials

Active Publication Date: 2021-11-05
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Once synthesized, its permanent shape cannot be altered
At the same time, traditional processing methods such as molding and extrusion also reduce the complexity of the permanent shape of polymer materials, and cannot meet the customization requirements of permanent shapes that vary from person to person.
However, emerging methods such as 3D printing can achieve specific customization of permanent shapes, but greatly increase the cost of material processing.

Method used

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  • Method for preparing shape memory polymer device with complex permanent shape by utilizing secondary crosslinking and application of shape memory polymer device
  • Method for preparing shape memory polymer device with complex permanent shape by utilizing secondary crosslinking and application of shape memory polymer device
  • Method for preparing shape memory polymer device with complex permanent shape by utilizing secondary crosslinking and application of shape memory polymer device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment 1 (polyurethane-acrylate secondary crosslinking reaction system)

[0034] The raw material of embodiment 1 and source are as shown in table 1:

[0035] Table 1. Embodiment 1 raw material and source thereof

[0036]

[0037] Polymer Network Synthesis:

[0038] Mix HDI, PTMG, HEA, and Gly in DMF at a ratio of isocyanate to hydroxyl molar ratio of 1.05:1, where the ratio of PTMG, HEA, and Gly will determine the final properties of the material (such as the shape memory temperature of the material, etc.) , can be adjusted according to actual needs. After the above substances are mixed evenly, 1 wt% of DBTDL is added into the system as a polymerization catalyst, and 1 wt% of trimethylbenzoyl-diphenylphosphorus oxide is added as a photoinitiator under the condition of avoiding light. The obtained mixture was poured into a mold, cured at 70°C for 12 hours, post-cured at 120°C for 2 hours, and DMF was removed in a vacuum oven to obtain the desired polymer film....

Embodiment 2

[0041] Embodiment 2 (epoxy-acrylate secondary crosslinking reaction system)

[0042] The raw material of embodiment 2 and source are as shown in table 2:

[0043] Table 2. Embodiment 2 raw materials and sources thereof

[0044]

[0045] Polymer Network Synthesis:

[0046]Mix E44, D230, and GMA at a ratio of 2:1 between epoxy groups and primary amino groups. The ratio of E44, D230 and GMA will affect the performance of the final material, and the ratio can be adjusted according to actual needs. After the above-mentioned substances are mixed evenly, 1 wt% of trimethylbenzoyl-diphenylphosphorus oxide is added into the system as a photoinitiator. The resulting mixture was poured into a mold, cured in an oven at 70°C for 12 hours, and post-cured in an oven at 120°C for 2 hours to obtain the desired polymer film.

[0047] polymer network

[0048] The synthesized polymer film deforms under stress (such as being pressed and deformed when attached to the surface of an object), ...

Embodiment 3

[0049] Embodiment 3 (polyurethane-cycloaddition secondary crosslinking reaction system)

[0050] The raw material of embodiment 3 and source are as shown in table 3:

[0051] Table 3. Embodiment 3 raw materials and sources thereof

[0052]

[0053]

[0054] Polymer Network Synthesis:

[0055] Mix HDI, PTMG, HEA, and DAME in DMF at a ratio of isocyanate to hydroxyl molar ratio of 1.05:1, where the ratio of PTMG, HEA, and DAME will determine the final performance of the material (such as the shape memory temperature of the material, etc.) , can be adjusted according to actual needs. After the above substances are mixed evenly, 1 wt% of DBTDL is added into the system as a polymerization catalyst, and 1 wt% of trimethylbenzoyl-diphenylphosphorus oxide is added as a photoinitiator under the condition of avoiding light. The obtained mixture was poured into a mold, cured at 70°C for 12 hours, post-cured at 120°C for 2 hours, and DMF was removed in a vacuum oven to obtain the...

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Abstract

The invention discloses a method for preparing a shape memory polymer device with a complex permanent shape by utilizing secondary crosslinking. The method comprises the following steps of: (1) preparing a polymer device which can be subjected to secondary crosslinking and has a shape memory function; (2) changing the permanent shape of the polymer device by utilizing the secondary crosslinking to obtain a temporary shape; and (3) fixing the temporary shape under a certain condition, and when the polymer device is placed in an application scene, restoring the polymer device to the permanent shape through external stimulation. The permanent shape is flexible and adjustable, high complexity can be achieved, and the shape memory behavior is good after the permanent shape is changed. Depending on specific usage scenarios and usage requirements, the device can realize customization of a permanent shape which varies according to the needs of people, and change of the permanent shape in a time range from seconds to hours. The invention also discloses application of the shape memory polymer device with the complex permanent shape, which is prepared by the method, on a tooth forming sheet attached to a human body and an implantable trachea or intravascular stent.

Description

technical field [0001] The invention belongs to the technical field of shape-memory materials, in particular to a method and application for preparing shape-memory polymer devices with complex permanent shapes by secondary crosslinking. Background technique [0002] Shape-memory polymers can be programmed into temporary shapes under certain conditions, and change from temporary shapes to permanent shapes again under external stimuli (such as light, heat, etc.). This special polymer material has great application potential in the fields represented by medical treatment (such as: U.S. Patent, Publication No.: US 9731045B2; U.S. Patent, Publication No.: US8834522B2; U.S. Patent, Publication No.: US 8685528B2). For example, if the specific deformation behavior of some medical devices can be realized, the safety and effect of surgery will be greatly improved. For example, the tracheal stent can be compressed and put into the patient's body, and then automatically expand into a s...

Claims

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Application Information

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IPC IPC(8): C08F299/06C08F299/02C08F2/48C08G18/67C08G18/66C08G18/48C08G18/32A61L27/16
CPCC08F299/065C08F299/028C08F2/48C08G18/672C08G18/6677C08G18/4854C08G18/3206A61L27/16C08L55/005
Inventor 谢涛郑宁冯海军赵骞
Owner ZHEJIANG UNIV
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