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Method for preparing star-shaped biodegradable shape-memory-polymer nano composite material

A technology of nanocomposite materials and memory polymers, which is applied in the field of preparation of star-shaped biodegradable shape memory polymer nanocomposites, can solve the problems of unsatisfactory repeated memory effect, insufficient mechanical strength, and small shape recovery force. Achieve the effects of repeatable biodegradability, strong deformation retention and high shape recovery rate

Inactive Publication Date: 2015-07-01
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, compared with other shape memory materials, shape memory polymers have problems such as insufficient mechanical strength, small shape recovery force, slow recovery rate, unsatisfactory repeat memory effect, serious relaxation and creep, etc., which greatly limit its application range.

Method used

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  • Method for preparing star-shaped biodegradable shape-memory-polymer nano composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Put 1.8L methanol, 79.5g (3-chloropropyl) trimethoxysilane, 90ml hydrochloric acid in a 2.5L beaker, stir at room temperature for 5 weeks, filter to obtain white powder, wash with deionized water and dry to obtain POSS -(Cl) 8 . Add 4.71g AgNO to a 100ml round bottom flask 3 , add 30ml deionized water to dissolve it. An aqueous solution containing 1.11 g of NaOH was added to the above solution under vigorous stirring. Brown Ag 2 O was precipitated, filtered with suction, and washed three times with deionized water. Add 3g POSS-(Cl) in 250ml round bottom flask 8 , 75ml ethanol, 75ml tetrahydrofuran, the above Ag 2 O was added to the solution together with 3ml of deionized water, and the system was vigorously stirred for 48 hours in a dark environment, and refluxed at 74°C. Filtrate twice, take the clear liquid and then spin evaporate to obtain a white solid, namely POSS-(OH) 8

[0025] Add 7.258g (0.0504 mol) of D,L-lactide after three times of recrystallization...

Embodiment 2

[0028] POSS-(OH) 8 The preparation method is as embodiment 1.

[0029]Add 8.064g (0.056mol) of D,L-lactide after three times of recrystallization from vinyl acetate into a 50ml dry round bottom flask, add 0.0414g (4.93×10 -5 mol) POSS-(OH) 8 , 15μl stannous octoate (0.001mol / L). Polymerize for 24 hours at 130°C under nitrogen protection. After the reaction was completed, dichloromethane was added to dissolve, and then the product was precipitated and purified by adding iced n-hexane, and vacuum-dried to obtain a white flocculent polymer. The molecular weight is 128,000. Dissolve 1.396g of the obtained white flocculent polymer in 14ml of anhydrous dichloromethane, add 0.0875g of polytetramethylene ether glycol, and add 0.0166g of 1,6-hexamethylene diisocyanate after it is completely dissolved and 0.01 wt% chain extension catalyst stannous octoate. Stir at room temperature for 4h, pour into a polytetrafluoroethylene mold, room temperature, N 2 The solvent was volatilized ...

Embodiment 3

[0031] POSS-(OH) 8 The preparation method is as embodiment 1.

[0032] Add 7.98g (0.055mol) of dried D,L-lactide after three times of recrystallization from vinyl acetate into a 50ml dry round bottom flask, add 0.0258g (3.08×10 -5 mol) POSS-(OH) 8 , 15μl stannous octoate (0.001mol / L). Polymerize for 24 hours at 130°C under nitrogen protection. After the reaction was completed, dichloromethane was added to dissolve, and then the product was precipitated and purified by adding iced n-hexane, and vacuum-dried to obtain a white flocculent polymer. The molecular weight is 244,000. Dissolve 1.44g of the obtained white flocculent polymer in 14ml of anhydrous dichloromethane, add 0.0472g of polytetramethylene ether glycol, and add 0.0089g of 1,6-hexamethylene diisocyanate after it is completely dissolved and 0.01 wt% chain extension catalyst stannous octoate. Stir at room temperature for 4h, pour into a polytetrafluoroethylene mold, room temperature, N 2 The solvent was volatil...

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Abstract

The invention relates to a method for preparing a star-shaped biodegradable shape-memory-polymer nano composite material. According to the shape-memory composite material, POSS and isocyanate chain segments are taken as a hard phase, and poly-D,L-lactide and polytetramethylene ether glycol are taken as a soft phase. The method for preparing the shape-memory composite material comprises the steps of firstly preparing polyhedral silsesquioxane, of which eight vertexes are provided with hydroxyl groups, initiating the ring-opening polymerization of D,L-lactide with polyhedral silsesquioxane so as to prepare star-shaped POSS-PLA of a certain molecular weight, and then, coupling to polytetramethylene ether glycol through diisocyanate, thereby forming a three-dimensional reticulated copolymer. The shape-memory composite material prepared by the method has the characteristics of strong deformation holding ability, high shape recovery rate, good shape memory performance and repeatability, biodegradation and the like; furthermore, due to the adding of inorganic nanoparticle POSS, the recovery stress of a shape memory polymer is increased.

Description

technical field [0001] The invention belongs to the field of medical biomaterials, and relates to a preparation method of a star-shaped biodegradable shape memory polymer nanocomposite material. Background technique [0002] With the rapid development of science and technology in today's society, the development of materials has played a positive role in the progress of human society. At the same time, the development of different fields and the intersection of various disciplines put forward higher requirements for the performance and function of materials, and people's requirements for materials are getting higher and higher. Under such a background, various new materials emerge as the times require. Smart materials with inherent sensing, execution, control, and information processing functions in microstructures are one of them. Their structures not only have the load-bearing functions of ordinary materials, but also have specific perception and response functions. As a...

Claims

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Application Information

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IPC IPC(8): C08G18/46C08G18/48C08G63/08C08J3/24
CPCC08G18/4018C08G18/4692C08G18/4854C08G63/6952C08G2230/00C08G2280/00
Inventor 顾书英高偰峰
Owner TONGJI UNIV
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