摘要
以对苯二甲酰氯和２，５－二羟基－１，４－苯撑双－（对烷氧基苯甲酸酯）为单体，采用低温溶液缩聚方法，合成了一系列含Ｘ－型二维液晶基元的液晶高分子。聚合物的液晶行为用ＤＳＣ和偏光显微镜进行了表征。发现所有的聚合物均为向列型热致液晶高分子。随单体结构改变，聚合物的熔点（Ｔｍ）和液晶态清亮点（Ｔｉ）均呈规律性变化。
A series of liquid crystal polymers with x shaped two demensional mesogenic units were synthesized by low temperature solution polycondensation by using terephthalic acid dichlorid and 2,5 dihydroxyl 1,4 phenylene di p alkoxylbenzoate as monomer. The liquid crystalline behavior of the polymers was characterized by DSC and polarizing microscopy with a heating stage. It is found that all the polymers are nematic thermotrpoic liquid crystal polymers. The melting temperature Tm and the clearing temperature Ti of the polymers change regularly with varying of the length of the alkyl substituent groups.
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
1999年第2期28-31,共4页
Polymer Materials Science & Engineering
基金
国家自然科学基金
关键词
X-型
液晶基元
液晶高分子
合成
liquid crystalline polymers, X shaped two dimensional mesogenic unit, synthesis and characterization
