熱效應下的寡聚合藍相液晶

Abstract

根據先前的文獻，為了拓寬藍相液晶(Blue Phase Liquid Crystal, BPLC)的溫寬，大多使用光聚合高分子單體來穩固藍相液晶，但由於製程方式複雜，所以，本論文提出一種較為簡便的方法，利用具有熱聚合特性的高分子單體來拓寬藍相液晶溫寬，並比較光聚合藍相液晶與熱聚合藍相液晶之間的光電特性。 實驗結果指出，利用具有熱聚合性質的高分子單體NOA65，可以拓寬藍相液晶的溫寬。為了優化拓寬效果，所以做了以下的討論分析：(1)高分子的摻雜濃度；(2)高分子受熱聚合的溫度；(3)高分子受熱聚合的時間。經過上述參數的調整，可將原本溫寬只有5.3 °C的藍相液晶拓寬至20.0 °C，並量測不同製程下的藍相液晶光電特性，發現受過熱聚合的高分子藍相液晶，反應速度會比一般受到光聚合的高分子藍相液晶還要迅速。 本論文提出一個簡易的方法來穩固藍相液晶，只需考慮熱聚合溫度的變數，這將有助於藍相液晶未來在光電元件上的應用。

Photopolymerization has been a popular method used to extend the temperature range of liquid crystal blue phase. However, it needs to control the temperature and UV intensity simultaneously. That makes the process very complicated. In this study, we applied the thermal polymerization to extend the temperature range of blue phase and compared the electro-optical properties between thermal polymerization blue phase and photopolymerization blue phase. The influences of monomer concentration, temperature, and heating time on the temperature range of blue phase were studied. The temperature range of blue phase can change from 5.3 °C to 20.0 °C by optimizing the process. A faster response time of thermal polymerization blue phase than photopolymerization blue phase was also observed.