不同软段长度PBT-co-PCT-b-PEG嵌段共聚物的结构与性能  

CHARACTERIZATION AND PROPERTIES OF PBT-co- PCT-b-PEG SEGMENTED BLOCK COPOLYMERS WITH VARYING SOFT SEGMENT LENGTH

作　　者：张勇[1] 冯庆玲[1] 崔福斋[1] 冯增国[2] 

机构地区：[1]清华大学材料科学与工程系,北京100084 [2]北京理工大学材料科学与工程学院,北京100081

出　　处：《高分子材料科学与工程》2005年第1期180-183,187,共5页Polymer Materials Science & Engineering

基　　金：国家"863"计划资助项目(2001AA216071)

摘　　要：用熔融缩聚法合成了一系列具有相同软段摩尔含量,不同软段长度的聚对苯二甲酸丁二醇酯(PBT)-co-聚对苯二甲酸环己烷二甲醇酯(PCT)-b-聚乙二醇(PEG)嵌段共聚物(PBCG)。NMR分析表明,共聚物软段质量百分含量随PEG分子量(Mn(PEG))增加而增加,随PCT摩尔百分数(MPCT)增加而减小;结构中两种硬段呈无规分布,Mn(PEG)一定,随MPCT增加,PBT平均序列长度减小,而PCT平均序列长度增加。硬段熔点及结晶度在MPCT为20%～30%处达到最小值。TGA分析显示,向体系中引入PCT可提高共聚物热稳定性。The poly(butylene terephthalate)-co-poly(cyclohexylene dimethylene terephthalate)-b-poly(ethylene glycol) segmented block copolymers (PBCG) with different soft segment length were synthesized through transesterification/polycondensation process and characterized using GPC, NMR, thermal analysis and mechanical testing etc. The average sequence length of hard segment PBT decreases as the increase of the molar fraction of PCT, while that of PCT decreases. And the two hard segments distribute randomly along the polymer chain. The melting points and crystallinity of hard segments and decomposition temperature of the copolymers changed with varying of average sequence length were also observed for the incorporation of PCT moieties.

关 键 词：聚醚酯弹性体 序列结构分析 缩聚 热分析 力学性能 

分 类 号：O631.11[理学—高分子化学]