Characterization and Applications of Chiral Polymers on Polymer Dispersed Liquid Crystal Films

• Main Authors: Yu-Fang Wang, 王裕芳
• Other Authors: Professor Jenn-Hwa Wang
• Format: Others
• Language: zh-TW
• Published: 1995
• Online Access: http://ndltd.ncl.edu.tw/handle/26593629124585793068

碩士 === 國立成功大學 === 化學工程研究所 === 83 === Chiral (+)-bornyl methacrylate [(+)-BMA] and achiral (±)-bo- rnyl methacrylate [(±)-BMA] were synthesized from (+)-camphor and (±)-camphor, respectively. To investigate the application of chiral polymers on the PDLC films, a commercial available positive nematic liquid crystal E7 was dispersed in chiral and achiral polymer matrixes. The electro-optic characteristics and the microstructures of the PDLC films with chiral polymers and achiral racemized polym- ers were investigated. It was found that PDLC films with chiral polymers have high contrast ratio and fast falling speed, but exist a transient damping effect. Two distinct morphologies were observed: (1) a 〝continual channel〞 with chiral polymer matrix , and (2) an 〝isolated ball〞 with achiral racemized polymer ma- trix. In addition,the electro- optic characteristics of the negative nematic liquid crystal mixture ( MBBA/EBBA ) synthesized in this investigation were also investigated.