多巴胺改性聚二乙炔复合热致变色材料的制备及性能  

Preparation and Properties of Dopamine Modified Polydiacetylene Composite Thermochromic Material

作　　者：刘浩 谭家玲 于伟东 刘佳音 王潮霞 Hao Liu;Jia-ling Tan;Wei-dong Yu;Jia-yin Liu;Chao-xia Wang(College of Textile Science and Engineering,Jiangnan University,Wuxi 214122)

机构地区：[1]江南大学纺织科学与工程学院,无锡214122

出　　处：《高分子学报》2024年第4期428-437,共10页Acta Polymerica Sinica

基　　金：国家自然科学基金(基金号21975107)资助项目。

摘　　要：聚二乙炔变色温度较高且受热构象转变后难以回复,可通过端基改性赋予其热致变色可逆的性能并改变变色温度,以适合应用在人体温度智能传感方面.采用多巴胺改性二乙炔形成分子间氢键,二乙炔头基处多巴胺聚合形成共价键,254 nm紫外光照形成双聚合体系(Poly-PCDA-PDA),且将改性二乙炔与热塑性聚氨酯(TPU)进行复合.改性后聚二乙炔相转变点由62℃降低至约39℃,热致变色温度为35℃且能够在蓝-紫相之间发生完全可逆转变,改性二乙炔与TPU的复合制备了稳定性高且能够发生可逆热致变色的薄膜,更符合人体温度环境应用场景.提供了一种多巴胺取代头基后通过共价键连接进一步改性聚二乙炔的策略,有望在聚二乙炔基人体温度传感材料的研究中起到重要作用.Polydiacetylene is a kind of polymer that can transform conjugate skeleton to lead to change color when the ambient temperature changes.But its thermochromic temperature is high and it is difficult to recover after conformation transformation.The thermochromic materials which meet the application of human temperature intelligent sensing can be obtained by head-group modification.In this study,dopamine was used to modify diacetylene monomer to create covalent bonds at the head group.A double polymerization system(Poly-PCDA-PDA)was produced under 254 nm UV light to investigate the effect of polydopamine on the thermochromic temperature and the reversible recovery property.Composite thermochromic materials were prepared by combining PCDA-PDA with thermoplastic polyurethane(TPU).After modification,the polydiacetylne,whose phase transition point was reduced from 62℃to about 39℃,can transform color from blue to purple at 35℃.The thermal performance analysis showed that the combination of TPU improved the stability of PCDA-PDA without affecting the thermochromism performance.The thermochromic material is more in line with the application scenario of human temperature environment.This paper provides a strategy for further modification of polydiacetylene by covalent bonding after dopamine-substituted head group,which is expected to play an important role in the research of polydiacetylidene temperature sensing materials.

关 键 词：热致变色 聚二乙炔 多巴胺 聚氨酯 自组装 

分 类 号：TQ317[化学工程—高聚物工业]