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Shape memory polymer based on sliding cross-linking structure and preparation method therefor

A memory polymer and sliding cross-linking technology, applied in the production of bulk chemicals, etc., can solve the problems of limited material deformation, poor shape recovery, and poor physical cross-linking stability, and achieve excellent shape memory performance and large deformation , the effect of excellent 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

Network points are generally divided into two types: chemical cross-linking and physical cross-linking. As a rigid cross-linking point, chemical cross-linking will limit the movement of molecular chains and limit the deformation of the material; physical cross-linking has poor stability. Although it can achieve high deformation, it is due to The slippage of molecular chains during the extruding process will result in poor shape recovery

Method used

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  • Shape memory polymer based on sliding cross-linking structure and preparation method therefor
  • Shape memory polymer based on sliding cross-linking structure and preparation method therefor

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0024] The ratio is as follows:

[0025] A: Vinyl monomers:

[0026] Methyl methacrylate (MMA): 10g

[0027] Methyl acrylate (MA): 10g

[0028] B: Polyrotaxane:

[0029] Polyrotaxane (the number of ring molecules is 20) 0.6g

[0030] C: Initiator:

[0031] AIBN: 0.1g

[0032] D: Solvent:

[0033] DMSO: 20g

[0034] The preparation method is as follows: Add vinyl monomer, polyrotaxane, initiator, and crosslinking agent into the reaction bottle, stir and dissolve at room temperature, pass nitrogen gas for 30 minutes, raise the temperature to 60°C, and inject the reactant into the reaction bottle after half an hour of reaction In a sealed spiral tube, react at a constant temperature of 60° C. for 24 hours to obtain a helical polymer. After removing the solvent, vacuum-dry to obtain the product.

[0035] Product indicators:

[0036] Transition temperature: 65°C;

[0037] Deformation: 820%;

[0038] Shape fixation rate at room temperature: 99%

[0039] Shape recovery ra...

example 2

[0042] The ratio is as follows:

[0043] A: Vinyl monomers:

[0044] MMA: 10g

[0045] MA: 10g

[0046] B: Polyrotaxane:

[0047] Polyrotaxane (the number of ring molecules is 20) 1g

[0048] C: Initiator:

[0049] AIBN: 0.2g

[0050] D: Solvent:

[0051] DMSO: 15g

[0052] The preparation method is as follows: Add vinyl monomer, polyrotaxane, initiator, and crosslinking agent into the reaction bottle, stir and dissolve at room temperature, pass nitrogen gas for 30 minutes, raise the temperature to 60°C, and inject the reactant into the reaction bottle after half an hour of reaction In a sealed glass plate, react at a constant temperature of 60°C for 36 hours to obtain a sheet-like polymer. After removing the solvent, dry it in vacuum to obtain the product.

[0053] Product indicators:

[0054] Transition temperature: 70°C;

[0055] Deformation: 700%;

[0056] Shape fixation rate at room temperature: 100%

[0057] Shape recovery rate at 85°C: 99%;

[0058] Shape r...

example 3

[0060] The ratio is as follows:

[0061] A: Vinyl monomers:

[0062] MMA: 10g

[0063] Ethyl acrylate (EA): 10g

[0064] B: Polyrotaxane:

[0065] Polyrotaxane (the number of ring molecules is 50) 1g

[0066] C: Initiator:

[0067]AIBN: 0.14g

[0068] D: Solvent:

[0069] DMSO: 20g

[0070] The preparation method is as follows: Add vinyl monomer, polyrotaxane, initiator, and crosslinking agent into the reaction bottle, stir and dissolve at room temperature, pass nitrogen gas for 20 minutes, raise the temperature to 70°C, and inject the reactant into the reaction bottle after half an hour of reaction In a sealed glass plate, react at a constant temperature of 70° C. for 12 hours to obtain a sheet-like polymer. After removing the solvent, dry it in vacuum to obtain the product.

[0071] Product indicators:

[0072] Transition temperature: 51°C;

[0073] Deformation: 710%;

[0074] Shape fixation rate at room temperature: 98%;

[0075] Shape recovery rate at 65°C: 98%...

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Abstract

The invention relates to a shape memory polymer based on a sliding cross-linking structure and a preparation method therefor. The shape memory polymer is characterized in that slidable ring-shaped molecules on polyrotaxane as cross-linking points are polymerized with allyl monomers to obtain a shape memory polymer material of the sliding cross-linking structure. The sliding cross-linking structure is different from conventional physical cross-linking and chemical cross-linking structures, and is combined with the characteristics of physical cross-linking and chemical cross-linking, so that the sliding cross-linking structure is free of rigidity like chemical cross-linking to limit the motion of molecular segments or free of instability like physical cross-linking to easily cause disentanglement of the cross-linking points or sliding of the molecular segments. The sliding cross-linking structure can adjust the acting force among the molecular segments through the sliding of the cross-linking points, the stress concentration is prevented from appearing too early, and thus the mechanical properties of the material are improved.

Description

[0001] Technical field: The present invention relates to a shape memory polymer based on a sliding cross-linked structure and a preparation method thereof, belonging to the field of new polymer materials. Background technique [0002] As a new type of intelligent material, shape memory polymer material refers to the ability to perceive the stimulus of environmental changes and respond to such changes, adjust its state parameters (such as shape, position, strain, etc.), so as to return to the preset state. Material. Compared with shape memory alloys, it has many advantages such as light weight, low price, easy processing, large deformation, and easy adjustment of transition temperature. It has become a new hotspot in the research, development and application of polymer materials. , textile, packaging and other fields have a wide range of potential applications. [0003] With the development of polymer synthesis technology and the deepening of polymer structure and performance ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/00C08F220/14C08F220/18
CPCY02P20/54
Inventor 丁小斌王亚茹李兴建潘毅郑朝晖彭宇行
Owner CHENGDU ORGANIC CHEM CO LTD CHINESE ACAD OF SCI