PET/HBA/TA/HQ四元共聚酯形态及相结构的研究  

Morphology and Phase Behavior of the PET/HBA/HQ/TA Copolyesters

作　　者：兰强[1] 程丹[1] 于瀛[1] 卜海山[1] 

机构地区：[1]复旦大学材料科学系,上海200433

出　　处：《高等学校化学学报》2003年第9期1712-1716,共5页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:29774004)

摘　　要：研制了一套蚀刻方法并对聚对苯二甲酸乙二醇酯/对羟基苯甲酸/对苯二甲酸/对苯二酚(PET/HBA/TA/HQ)体系的共聚酯液晶试样断面进行蚀刻,并用扫描电镜观察,发现此类共聚酯中存在两相结构。当PET摩尔分数小于50％时,分散相呈球状且富含PET,连续相富含全芳族链段;当PET摩尔分数等于或大于50％时,分散相和连续相结构发生颠倒,连续相富含PET,分散相球状粒子富含全芳族链段且为纤维状结构。因此可以断言,用熔融缩聚方法制备的PET/HBA/TA/HQ四元共聚酯不是无规共聚物,而是嵌段共聚物。A series of etching methods were developed for the morphology observation of liquid crystalline copolyester. Phase behavior of the PET/HBA/HQ/TA copolyester was investigated by SEM after etching. A two-phase structure of these copolyesters was found. When PET molar fraction is lower than 50%, HBA/HQ/TA-rich-phase is a continuous phase, while the dispersion particles are PET-rich-phase. When PET molar fraction is equal to or greater than 50% , PET-rich-phase constitutes continuous phase, while HBA/HQ/TA-rich-phase forms dispersion particles which are composed of fibers. Therefore this PET/HBA/HQ/TA copolyester is not a random copolymer but a block one with long PET blocks.

关 键 词：PET/HBA/TA/HQ 四元共聚酯 形态 相结构 蚀刻 液晶 聚对苯二甲酸乙二醇酯 对羟基苯甲酸 

分 类 号：O633.14[理学—高分子化学] O631.1[理学—化学]