初始形状可多次重构的香豆素基聚乙烯醇形状记忆聚合物  

Coumarin-based Polyvinyl Alcohol Shape Memory Polymers with Repeatedly Reconfigurable Initial Shapes

作　　者：赵小海 白军伟 张军华[3] ZHAO Xiaohai;BAI Junwei;ZHANG Junhua(School of New Materials and Chemical Engineering,Guang an Vocational&Technical College,Guang an 638000,China;China Bluestar Chengrand(Chengdu)Testing Technology Co.,Ltd.,Chengdu 610041,China;State Key Laboratory of Polymer Materials Engineering,Polymer Research Institute,Sichuan University,Chengdu 610065,China)

机构地区：[1]广安职业技术学院新材料与化学工程学院,四川广安638000 [2]中蓝晨光成都检测技术有限公司,四川成都610041 [3]四川大学高分子研究所,高分子材料工程国家重点实验室,四川成都610065

出　　处：《塑料工业》2024年第12期123-130,共8页China Plastics Industry

基　　金：四川省科技厅重点研发项目(2023YFG0238)。

摘　　要：利用香豆素基聚乙烯醇具有在365 nm紫外光照射下交联,交联点可以在254 nm紫外光照射下解交联,且解交联后的产物仍具有再交联能力的性质,本文设计了初始形状可多次重构的形状记忆聚合物,研究了接枝率、紫外光照射时间、薄膜厚度等对材料形状记忆特性的影响。结果显示,香豆素的接枝率越高,形状记忆聚合物被固定后的形状回复率越高。形状记忆聚合物的初始形状固定及热回复性能受365 nm紫外光照射时间、薄膜厚度的影响较大。采用合理的紫外光照射时间、高接枝率、较薄的膜,可以制得形状回复率在70%以上、初始形状可多次重构的形状记忆聚合物。本研究验证了上述设计方法的可行性,为制备具有可逆交联特性的聚合物提供了新的研究思路。Polyvinyl alcohol bearing coumarin has the ability to be cross-linked under the illumination of 365 nm ultraviolet light,and the cross-linked points can be photocleavaged after being illuminated with UV light of 254 nm,while the photocleavaged product still has cross-linking ability.Using this property,this paper designed shape memory polymers with repeatedly reconfigurable initial shapes.The effects of grafting rate,irradiation time,and the film thickness on the material shape memory properties were studied.It is found that the higher grafting rate of coumarin,the higher shape recovery ratio of the shape memory polymer after fixation.The initial shape fixation and thermal recovery performances of the shape memory polymers are greatly affected by the irradiation time of 365 nm ultraviolet light and the film thickness.By adopting an appropriate ultraviolet irradiation time,high grafting efficiency,and a thinner membrane,shape memory polymers could be produced with a shape recovery rate above 70%,allowing for repeatedly reconfigurable initial shapes.This study validates the feasibility of the above design method and provides a new research approach for preparing polymers with reversible cross-linking properties.

关 键 词：形状记忆聚合物 多重光致形状固定 聚乙烯醇 香豆素 

分 类 号：TQ325.9[化学工程—合成树脂塑料工业]