Restudy of the unusual phase behavior of the mesogen-jacketed liquid crystal polymers  

作　　者：ZHAO Yongfeng FAN Xinghe CHEN Xiaofang WAN Xinhua ZHOU Qifeng 

机构地区：[1]Key Laboratory of Polymer Chemistry and Physics of Ministry of Education,College of Chemistry,Peking University,Beijing 100871,China

出　　处：《Science China Chemistry》2006年第2期116-125,共10页中国科学(化学英文版)

基　　金：This work was supported by the National Natural Science Foundation of China(Grant No.20134010);the Ministry of Education of China(Key Project No.104005).

摘　　要：A series of poly{2,5-bis[(4-butoxyphenyl)-oxycarbonyl]styrenes}(PBPCS)with low mo-lecular weight distribution was synthesized by atom transfer radical polymerization(ATRP).The me-somorphic properties were investigated by differential scanning calorimetry(DSC),polarizing optical microscopy(POM)and rheometer.PBPCS showed the phase transition from isotropic into liquid crystal(LC)phase,and the LC phase formed at high temperature and disappeared in the subsequent cooling procedure.Using the WAXD fiber pattern,the phase structure of the PBPCS at higher tem-perature showed hexagonal columnar nematic phase.Experimental results demonstrated that the driving force of the entropy is an important factor during the unusual LC phase formation of PBPCS.

关 键 词：mesogen-jacketed liquid crystal polymers RHEOLOGY hexagonal columnar nematic phase. 

分 类 号：N[自然科学总论]