文献类型：期刊文章

作　　者：于振宁[1] 宛新华[1] 涂慧琳[1] 陈小芳[1] 周其凤[1]

机构地区：[1]北京大学化学学院高分子科学与工程系,北京100871

出　　处：《高分子学报》

基　　金：国家自然科学基金 (基金号 2 9992 5 90 - 4和 2 0 2 740 0 1);教育部高等学校博士学科点专项基金 (基金990 0 0 136 );教育部优秀青年教师教学与科研奖励基金资助项目

年　　份：2003

卷　　号：13

期　　号：3

起止页码：430-433

语　　种：中文

收录情况：AJ、BDHX、BDHX2000、CAS、CSCD、CSCD2011_2012、IC、JST、PL、RCCSE、SCI(收录号：WOS:000183620800020)、SCI-EXPANDED(收录号：WOS:000183620800020)、SCIE、SCOPUS、WOS、ZGKJHX、核心刊

摘　　要：A mesogen-jacketed liquid crystal polymer,poly{2,5 -bis［(4′-hexyloxyphenyl)oxycarbonyl］styrene}(PHPCS),with number-average d molecular weight of 1.28×１０5 and polydispersity of 1.48 was prepared vi a 2,2,6,6 -tetramethyl-piperidinyloxy mediated free radical polymerization.The thermotr opic behavior was studied by a combination of differential scanning calorimetry, thermogravimetry,polarized optical microscope and wide-angle X-ray diffracti on.PHPCS was not crystalline over the entire temperature region studied.On hea ting,PHPCS first became an isotropic melt at glass transition temperature (T g) and then a mesophase at temperatures much higher than T g.On subseq uent cooling,the formed ordered phase disappeared above T g.Contrary to t heoretical predictions and previous experimental observations,the transition fr om isotropic melt to liquid crystalline phase was an endothermic process and th e order-disorder transition took place with concurrence of heat release.

关 键 词：甲壳型液晶高分子 热致液晶行为  聚[2,5-双(4’-正己氧基苯氧羰基)苯乙烯]  结晶  合成  

分 类 号：O753]