Studies on Morphology Behaviors of Four-arm Star Azoxy polyester

• Main Authors: Chuh-Horng Chen, 陳志宏
• Other Authors: Jen-Feng Kuo; Chuh-Yung Chen
• Format: Others
• Language: zh-TW
• Published: 1994
• Online Access: http://ndltd.ncl.edu.tw/handle/37704157829434914799

碩士 === 國立成功大學 === 化學工程研究所 === 82 === In this article, the main purpose is to use the bezene-1,2,4, 5-tetracarboxylic acid(BTA) to modify the polyester of main chain thermotropic liquid crystal. We investigate the structure of liquid crystals and its beha- viors.In our studies, we use the 4,4'-dioxy-2,2'-dimethy azoxy benzene (Azoxy) as mesogenic unit, 1,12-dodecandionicaid (DDA) as spacer to synthesize the liquid crystal of poly(4,4'-dioxy-2,2'- dimethy azoxy benzene dodecandioyl), and indroduce the BTA, which has four reactive groups,to become four-arm star azoxy polyester. We perform polymerization reaction using the method of two-phase reaction. The phase transtfer catalyst is (C4H9)4N+HSO4-. Utiliz- ing the difference of the reactivity of BTA and DDA in the oil phase, the monomers in the oil phase will compete to copolymerize with azoxy in the water phase by appropriate molar feed ratio and produce the liquid crystal of BTA-[(Azoxy-DDA)n]4 or BTA-[( Azoxy- DDA)m]2 . Theses two copolymers both lower the transition temper- ature of liquid crystal Ti, Tm and order. But the alignment type of the liquid crystal would be affected by the benzene ring in the center. According to the increment of the average repeated unit n of the liquid crystal,the Ti,Tm and ΔS will be decreased. (the following is omitted)