Influence of the multi-functional epoxy monomers structure on the electro-optical properties and morphology of polymer-dispersed liquid crystal films
Influence of the multi-functional epoxy monomers structure on the electro-optical properties and morphology of polymer-dispersed liquid crystal films
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DOI：
10.1007/s00289-013-1000-6
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发表时间：
2013-08
期刊：
影响因子：
3.2
通讯作者：
M. Ellahi;Fang Liu;Ping Song;Yanzi Gao;H. Cao;M. Rafique;M. Khaskheli;M. Zubair Iqbal;Huai Yang
中科院分区：
文献类型：
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作者：
M. Ellahi;Fang Liu;Ping Song;Yanzi Gao;H. Cao;M. Rafique;M. Khaskheli;M. Zubair Iqbal;Huai Yang
采用聚合诱导相分离法制备了聚合物分散液晶（PDLC）薄膜，并对其电光性能进行了研究。为了实现这一点，多功能可固化的环氧单体的结构与不同的组成进料比和两组的重量百分比进行了检查在这项研究中。热固化单体的结构对PDLC膜的聚合物网络形态的综合影响分别在A组和B组中形成了小孔和适当分布的硬币状网络。利用液晶器件参数测试仪、紫外-可见-近红外分光光度计和扫描电子显微镜对PDLC膜的聚合物网络的详细特征和形貌进行了分析。同时，研究了固化温度的提高对烷基链长、短柔性链长和含刚性链段环氧单体结构的聚合物网络形态以及PDLC薄膜电光性能的影响。研究发现，通过调节环氧单体的结构和组成比例，可以调节聚合物网络的液晶畴尺寸，从而优化PDLC薄膜的电光性能，有利于降低PDLC器件中液晶总含量。
Polymer dispersed liquid crystal (PDLC) films were prepared by polymerization-induced phase separation method with nematic LC content as low as 40 wt%, and the electro-optical properties were carefully investigated. To accomplish this, the structure of multi-functional curable epoxy monomers with different composition feed ratios and the weight percentages of the two groups were examined in this study. The combined effects of heat-curable monomers’ structure on the conspicuous morphology of polymer network of PDLC films formed small holes and suitably distributed coin-like networks in both groups A and B, respectively. The detailed characteristics and morphology of polymer network of PDLC films were analyzed by employing liquid crystal device parameter tester, UV-Vis-NIR spectrophotometer and scanning electron microscope. Meanwhile, the enhanced curing temperature effects on the alkyl chain length, short flexible chain length, and rigid chain segment containing epoxy monomers structure on the increasing morphology of polymer network as well as electro-optical properties of PDLC films were also studied. It was found that the LC domain size of the polymer network could be regulated by adjusting the structure and composition ratio of curable epoxy monomers, and then the electro-optics of the PDLC films could be optimized, which is beneficial for decreasing the total LC content in PDLC devices.