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首页> 外文期刊>Journal of Applied Polymer Science >Electro-optic Properties of CO_2 Fixed-Polymer/Nematic LC Composite Films
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Electro-optic Properties of CO_2 Fixed-Polymer/Nematic LC Composite Films

机译：CO_2固定聚合物/向列液晶复合膜的电光性能

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Bis(cyclic carbonate) was obtained from the epoxide and CO_2 reaction with a quaternary ammonium halide salt catalyst. Cyclic carbonate derivatives were then reacted with amine to obtain quantitatively poly(liydroxy)urethanes that were reacted with isophoronediisocyanate (IPDI) and end capped with acrylate to form prepolymers. These prepolymers were mixed with reactive diluents and nematic LCs, and subjected to IN cure to form polymer/LC composite films in a transparent cell. Three types of diglycidyl ether [poly(propyleneglycol), cyclohexane, bisphenol A], three types of end-capping acrylates [2-hydroxyethyl acrylate (REA), 2-hydroxypropyl acrylate (RPA), and 2-hydroxyethyl methacrylate (HEMA)], three types of multyfunctional diluents [tripropyleneglycol diacrylate (TPGDA), trimethylolpropane triacrylate (TMPTA), di-pentaerythritolhydroxy penta/hexa acrylate (DPHPA)], and three types ofphotoinitia-tors(Irgacure-651, Irgacure-184, Darocure-1173) were incorporated to control the mor-phology , and hence, the electro-optic properties of the polymerematic LC composite films. Poly(propylene glycol) diglycidyl ether segment of polyurethane acrylate (PUA) showed lower Viscosity and gave larger domain size resulting in lower threshold (V_(10)) and driving (V_(90)) voltages, together with larger nematic-isotropic transition temper-ature depression. REA end-capped PUA gave larger polymer-LC phase separation and smaller V_(10) as well as V_(90). TPGDA-based PUA showed the lowest V_(10) and V_(90) and the shortest response time. Among the three types of photoinitiators used Irgacure-651 showed the larger LC domain, and smaller V_(10) and V_(90).
机译：由环氧化物和季铵盐催化剂在CO_2反应中获得双（环状碳酸酯）。然后使环状碳酸酯衍生物与胺反应，获得定量的聚（环氧乙氧基）氨基甲酸酯，其与异佛尔酮二异氰酸酯（IPDI）反应并用丙烯酸酯封端以形成预聚物。将这些预聚物与反应性稀释剂和向列LC混合，并进行IN固化，以在透明单元中形成聚合物/ LC复合膜。三种类型的二缩水甘油醚[聚丙二醇，环己烷，双酚A]，三种类型的封端丙烯酸酯[丙烯酸2-羟乙酯（REA），丙烯酸2-羟丙酯（RPA）和甲基丙烯酸2-羟乙酯（HEMA）] ，三种类型的多官能稀释剂[三丙二醇二丙烯酸酯（TPGDA），三羟甲基丙烷三丙烯酸酯（TMPTA），二季戊四醇羟基五/六丙烯酸酯（DPHPA）]和三种类型的光引发剂（Irgacure-651，Irgacure-184，Darocure-1173）为了控制形态而掺入了聚合物，因此控制了聚合物/向列型LC复合膜的电光性能。聚氨酯丙烯酸酯（PUA）的聚丙二醇二缩水甘油醚链段显示出较低的粘度并具有较大的畴尺寸，从而导致较低的阈值（V_（10））和驱动（V_（90））电压，以及较大的向列各向同性转变温度抑郁症。 REA封端的PUA具有更大的聚合物-LC相分离和较小的V_（10）以及V_（90）。基于TPGDA的PUA的V_（10）和V_（90）最低，响应时间最短。在使用的三种类型的光引发剂中，Irgacure-651显示出较大的LC域，而较小的V_（10）和V_（90）。

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