全息聚合物分散液晶的结构调控与性能

发布时间：2018-02-02 10:16

本文关键词： 聚合物分散液晶全息光聚合相分离图像存储　出处：《高分子学报》2017年10期 　论文类型：期刊论文

【摘要】：全息聚合物分散液晶(HPDLCs)是由富聚合物相与富液晶相周期性排列而成的结构有序高分子复合材料.HPDLCs通过单体/液晶复合体系的光聚合诱导相分离而形成,如何调控并定量化描述复合体系的光聚合反应动力学、凝胶化行为和相分离程度,进而获得结构规整、电光性能优异的HPDLCs是关键难题.专论概述了光引发体系、单体结构、纳米无机材料掺杂对HPDLCs结构及性能的影响.光引发阻聚剂通过引发和阻聚的竞争与协同,降低了光聚合反应速率、延迟了凝胶时间,促进形成衍射效率达90%的HPDLCs.超支化单体降低了复合体系黏度和光聚合反应速率,延迟了凝胶时间,促使形成衍射效率达94%、具有一维光子晶体结构的HPDLCs.丙烯酰胺单体优化了相分离结构,将HPDLCs的衍射效率提升至98%.纳米硫化锌掺杂在保持规整结构和高衍射效率的同时,大幅降低了HPDLCs的驱动电压.研究还确定了HPDLCs的相分离程度与凝胶时间的函数关系.构建兼具高衍射效率与低驱动电压的HPDLCs,推进其在彩色3D图像存储等领域的应用仍是重要课题.
[Abstract]:Holographic polymer dispersed liquid crystal (HPDLCs). HPDLCs, a structured ordered polymer composite, is formed by photopolymerization induced phase separation of monomers / liquid crystal composite system, which is composed of polymer rich phase and liquid crystal rich phase periodic arrangement. How to regulate and quantitatively describe the photopolymerization kinetics, gelation behavior and phase separation degree of the composite system, and then obtain the structure regularity. HPDLCs with excellent electro-optic properties is a key problem. The photoinitiator system and monomer structure are reviewed in this paper. The effect of nano-inorganic materials doping on the structure and properties of HPDLCs. Photoinitiator can reduce the photopolymerization rate and delay the gel time by the competition and coordination of initiation and polymerization inhibition. The hyperbranched monomers promoted the formation of HPDLCs with diffraction efficiency of 90%. The hyperbranched monomer decreased the viscosity and photopolymerization rate of the composite system, delayed the gelation time, and promoted the formation of the diffraction efficiency of 94%. The phase separation structure of HPDLCs. acrylamide with one-dimensional photonic crystal structure was optimized. The diffraction efficiency of HPDLCs was raised to 98. The nanocrystalline zinc sulfide doping kept the regular structure and high diffraction efficiency at the same time. The driving voltage of HPDLCs is greatly reduced. The functional relationship between the phase separation degree of HPDLCs and the gel time is also determined. The HPDLCs with high diffraction efficiency and low driving voltage is constructed. It is still an important subject to promote its application in color 3D image storage and other fields.
【作者单位】：华中科技大学化学与化工学院能量转换与存储材料化学教育部重点实验室;
【基金】：国家自然科学基金重点项目(基金号51433002);国家自然科学基金青年科学基金(基金号51503045)资助项目
【分类号】：O753.2
【正文快照】： **通讯联系人,E-mail:hypeng@hust.edu.cn;xlxie@mail.hust.edu.cn奥地利植物学家Reinitzer和德国物理学家Lehmann于19世纪80年代后期共同开创了液晶科学[1].液晶既表现出晶体的光学各向异性,又具有液体的可流动性,并在电、热、磁、光等外场作用下能够快速响应,因此在显示领域

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