高分子濃度對雙穩態聚合物穩定膽固醇型液晶結構之光電特性影響研究

Abstract

將旋性物質參雜入向列型液晶中，藉由濃度調配達到理想螺距的膽固醇態。然後把高分子單體和膽固醇液晶均勻混合後，灌入具有表面處理的空樣品中，然後透過光聚合作用進而形成聚合物穩定膽固醇型液晶結構(PSCT)，藉由高分子聚合物的鍵結，使得元件整體結構變得更加穩定。

本實驗成功製作出具有雙穩態並具特定反射波長的PSCT樣品，並研究高分子濃度對反射光譜、樣品對電壓的脈衝響應及反應時間等光電性質之影響，並在偏光顯微鏡下觀察樣品的反應行為，另外亦探討照光時間、照光強度、光起始濃等製程條件對樣品之影響。

依照目前實驗結果可以推論高分子單體濃度較高或照光強度較強的樣品，會造成反射率和穿透率降低，但卻擁有較快的反應時間。

We mix nematic liquid crystal with chiral materials and control the concentration to reach cholesteric liquid crystal texture. In order to stable the texture of cell, the cholesteric liquid crystal has been mixed with monomer and polymerized the monomer by UV lamp. After the process of polymerization finished, this cell is called “polymer stabilized cholesteric liquid crystal texture” or PSCT. In this work, the PSCT cells show bistable property and reflects specific wavelength. Then, we study the polymer concentration effect in the Eletro-optic properties. We have also studied the effects caused by polymerization time, polymerization intensity, and the concentration of photoinitiator. According to the experimental results, we find that the higher polymer concentration and polymerization intensity used, the less reflectance and transmittance we get , but the response time is much faster.