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Degradable shape memory high polymer material of regular network structure and preparation method therefor

A polymer material and network structure technology, applied in the field of preparation of degradable shape memory polymer materials, can solve problems such as uneven distribution of crosslink density, weakened shape memory performance, and impaired mechanical properties

Inactive Publication Date: 2015-11-04
CHENGDU ORGANIC CHEM CO LTD CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For randomly cross-linked shape memory polymers, the density distribution of cross-linking points is uneven, and the length of molecular chains is inconsistent. When deformed and stretched, there are irreversible molecular chain breaks in the highly cross-linked area, which not only damages the mechanical properties but also weakens the shape memory properties.

Method used

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  • Degradable shape memory high polymer material of regular network structure and preparation method therefor
  • Degradable shape memory high polymer material of regular network structure and preparation method therefor
  • Degradable shape memory high polymer material of regular network structure and preparation method therefor

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0021] A four-armed macromonomer

[0022] Azido-functionalized four-arm poly D, L-lactide (M n =23000) 3g

[0023] Alkyne-terminated four-armed poly-D, L-lactide (M n =23000) 3g

[0024] B Catalyst

[0025] CuI 0.06g

[0026] C solvent

[0027] Dichloromethane 48g

[0028] The reaction formula is as follows:

[0029]

[0030] The preparation method is as follows: azido and terminal alkyne functionalized four-arm macromolecular monomer, CuI and dichloromethane are added into a reaction bottle, stirred and dissolved at room temperature, and injected into a reaction mold. React at 60° C. for 6-12 hours, and dry after demoulding to obtain a shape-memory material with a regular network structure.

[0031] Product indicators:

[0032] Glass transition temperature: 46°C;

[0033] Shape recovery rate at 51°C: 99%;

[0034] Shape recovery time: 5 seconds.

example 2

[0036] A four-armed macromonomer

[0037] Thiol-functionalized four-arm polycaprolactone (M n =46000) 3g

[0038] Norbornene-functionalized four-arm polycaprolactone (M n =46000) 3g

[0039] B Catalyst

[0040] Photoinitiator (2-hydroxy-4'-(2-hydroxyethoxy)-2-methylpropiophenone) 0.06g

[0041] C solvent

[0042] Dichloromethane 48g

[0043] The reaction formula is as follows:

[0044]

[0045] The preparation method comprises: adding mercapto group and norbornene functionalized four-arm macromolecular monomer, photoinitiator and dichloromethane into a reaction bottle, stirring and dissolving at room temperature, and injecting into a reaction mold. Under the condition of room temperature, the ultraviolet light is reacted for 1-10 minutes, and the shape memory material with regular network structure can be obtained after demolding and drying.

[0046] Product indicators:

[0047] Melting point: 54°C;

[0048] Shape recovery rate at 70°C: 99%;

[0049] Shape recovery...

example 3

[0051] A four-armed macromonomer

[0052] Methylfuran functionalized four-arm polylactide-co-caprolactone (M n =10500) 3g

[0053] Maleic anhydride functionalized four-arm polylactide-co-caprolactone (M n =10500) 3g

[0054] B Catalyst

[0055] Photoinitiator (2-hydroxy-4'-(2-hydroxyethoxy)-2-methylpropiophenone) 0.06g

[0056] C solvent

[0057] Dichloromethane 48g

[0058] The reaction formula is as follows:

[0059]

[0060] The preparation method is as follows: methyl furan and maleic anhydride functionalized four-arm polylactide-co-caprolactone, a photoinitiator and methylene chloride are added into a reaction bottle, stirred and dissolved at room temperature, and injected into a reaction mold. React at 37°C for 6-12 hours, and dry after demoulding to obtain a shape-memory material with a regular network structure.

[0061] Product indicators:

[0062] Glass transition temperature: 36°C;

[0063] Shape recovery rate at 40°C: 99%;

[0064] Shape recovery time...

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Abstract

The invention relates to a degradable shape memory high polymer material of a regular network structure and a preparation method therefor. The degradable shape memory high polymer material is characterized in that the degradable shape memory high polymer material of the regular network structure is obtained through step-growth polymerization of various equal-arm-length tetrahedral structure four-arm macromonomers with different special functional groups by utilizing an efficient click chemistry method. Different components of the network and compatibility and network soft and hard area distribution can be adjusted by selecting different four-arm macromonomers, so that the material has suitable microphase separation and different phase inversion temperatures to endow the shape memory performance. The preparation method can control the microstructure, shape memory performance, thermodynamic property and degradability of the material by adjusting the contents, types and molecular weights of the four-arm macromonomers, and is an effective method for obtaining the degradable shape memory high polymer material with excellent shape memory performance and high mechanical performance.

Description

technical field [0001] The invention relates to a preparation method of a degradable shape memory polymer material with regular network structure. A degradable shape-memory polymer material with a regular network structure obtained by cross-linking various four-armed macromonomers with different special functional groups through an efficient click chemical method belongs to the field of new polymer materials. Background technique [0002] Shape memory polymer is a smart polymer material that can respond to external stimuli and adjust its own state parameters to return to a preset state. It has the characteristics of diverse stimulation methods, large deformation, adjustable performance and response conditions, easy processing, easy shaping, light weight and low price. It has become a new hot spot in the research, development and application of intelligent polymer materials in recent years. It has shown extremely broad applications in the fields of smart textile materials, b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G81/00
Inventor 潘毅李兴建王亚茹郑朝晖丁小斌彭宇行
Owner CHENGDU ORGANIC CHEM CO LTD CHINESE ACAD OF SCI
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