对甲氧基偶氮苯星形聚合物的合成与表征

Synthesis and characterization of p-methoxyazobenzene star polymer

利用原子转移自由基聚合(ATRP)技术合成了对甲氧基偶氮苯星形聚合物。均苯三酚与2-溴异丁酰溴通过酯化反应得到三官能团引发剂,引发对甲氧基偶氮苯单体6-[4-(4-甲氧基苯基偶氮)酚氧基]己基甲基丙烯酸酯(MMAzo)的ATRP反应。表征了星形聚合物结构、热行为与液晶性,显示其与线性均聚物的液晶性相似,均显示近晶相和向列相,但其相转变温度有所降低。

p-Methoxyazobenzene star polymer was synthesized by the atom transfer radical polymerizatiom （ATRP）, Tfifunctional initiator prepared by the estefification of phloroglucinol with 2-bromoisobutylryl bromide was used to initiate the polymerization of 6- [ 4- （4- methoxyphenylazo） phenoxy ~ hexylmethycrylate （ MMAzo）, The star polymer was characterlzed by gel permeation chromatography （GPC） and ^1H-NMR, The liquid crystalline properties of the star polymer were investigated by DSC and POM. It was found that the star polymer has similar LC behavior to its corresponding linear homopolymer, and its phase transition temperatures slightly decreased.