Monomer Functionality Effects in the Formation of Thiol-Ene Holographic Polymer Dispersed Liquid Crystals
Monomer Functionality Effects in the Formation of Thiol-Ene Holographic Polymer Dispersed Liquid Crystals
复制标题
DOI：
10.1021/ma061829m
复制
发表时间：
2007-01
期刊：
影响因子：
5.5
通讯作者：
T. White;L. Natarajan;V. Tondiglia;P. Lloyd;T. Bunning;C. Guymon
中科院分区：
文献类型：
--
作者：
T. White;L. Natarajan;V. Tondiglia;P. Lloyd;T. Bunning;C. Guymon
全息聚合物分散液晶（HPDLCs）是一种具有波长选择性衍射的聚合物/液晶复合材料，可在电场作用下实现微秒级的波长转换。因此，HPDLC广泛应用于光学和光子器件。最近，用硫醇烯聚合物代替丙烯酸酯聚合物作为HPDLC的主体，提高了这些材料的稳定性和电光性能。这项工作研究了基于硫醇的HPDLC反射光栅的电光性能和形态。为了进一步理解硫醇烯HPDLC的形成和性能之间的关系，电光性能被表征为聚合速率、凝胶点转化率和过量单体（化学计量）的存在的函数。为此，检查HPDLC制剂以分离烯单体官能度、硫醇单体官能度和硫醇-烯化学计量的贡献。在所有的配方中，HPDLC反射光栅的性能是相应的。
Holographic polymer dispersed liquid crystals (HPDLCs) are a polymer/liquid crystal (LC) composite with wavelength selective diffraction that can be switched in microseconds with electric field. As such, HPDLCs are widely applicable in optical and photonic devices. Recently, replacing acrylate polymer with thiol−ene polymer as host for HPDLCs has improved the stability and electrooptic performance of these materials. This work examines the electrooptic performance and morphology of thiol−ene-based HPDLC reflection gratings. To further understand the relationships between the formation and performance of thiol−ene HPDLCs, electrooptic performance was characterized as a function of polymerization rate, gel point conversion, and the presence of excess monomer (stoichiometry). To this end, HPDLC formulations were examined to isolate the contribution of ene monomer functionality, thiol monomer functionality, and thiol−ene stoichiometry. In all formulations, the performance of HPDLC reflection gratings is corre...