基于上转换发光的液晶高分子复合材料光致形变研究

项目名称： 基于上转换发光的液晶高分子复合材料光致形变研究

项目编号： No.21273048

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 数理科学和化学

项目作者： 俞燕蕾

作者单位： 复旦大学

项目金额： 88万元

中文摘要： 光致形变液晶高分子通常是将偶氮类生色团引入液晶高分子网络形成的，在紫外光作用下，因生色团的光致异构化引起液晶分子重排，使液晶网络产生显著的光致形变，在构筑柔性微执行器方面备受关注。本项目以光响应性液晶高分子与上转换发光材料复合体系为研究对象，利用上转换发光引发生色团异构化及复合材料体系的近红外光致形变，开发绿色光源驱动的液晶高分子材料。项目将依据上转换发光材料的发射光波段与液晶高分子吸收峰波长相匹配的原则，选择和制备两类上转换发光材料（稀土上转换发光纳米材料和有机金属配合物体系）和两类液晶高分子（可后交联高分子和热聚合交联高分子）。分析优化上转换发光材料的上转换发光与液晶高分子吸收之间的能量转移效率，探讨复合材料的光致形变机理。合成易于加工成型的后交联型液晶高分子，并优化上转换发光材料与液晶高分子的复合途径，建立一种简便通用的复合材料制备方法及薄膜材料加工工艺。

中文关键词： 液晶高分子；偶氮；上转换发光；复合材料；光致形变

英文摘要： Photodeformable liquid crystal (LC) polymers are usually formed by incorporating azobenzene chromophores into LC networks. Upon the UV light irradiation, the chromophores undergo photoisomerization, which induces the reorientation of LC molecules and the significant photodeformation of LC networks. These photodeformable LC polymers have attracted much attention due to the potential applications as soft micro actuators. This project focus on the composite system consisting of photoresponsive LC polymers and upconversion luminescence materials, in which the upconversion luminescence is used to trigger the photoisomerization of chromophores and the photodeformation of the composite materials. The purpose is to develop green light driven LC polymer materials. According to the rue that the emission light band of upconversion luminescence materials matches the absorption wavelength of LC polymers, two kinds of upconversion luminescence materials (rare-earth upconversion nanophospors and metal-organic complexes) and two kinds of LC polymers (postcrosslinkable polymer and thermal crosslinked polymer) will be prepared. Energy transfer efficiency between the upconversion luminescence of upconversion luminescence materials and the absorption of LC polymers will be analyzed and optimized, while the photodeformation mechani

英文关键词： liquid crystal polymer；azo；upconversion luminescence；composite materials；photodeformation