相同软硬段质量配比聚醚酯弹性体PEG/PBT的结构与表征  

Characterization and Chain Structure of PEG/PBT Copolymer with the Constant Mass Ratio of Soft to Hard Segment

作　　者：张勇[1] 叶玲[2] 冯增国[1] 张爱英[1] 田小娟[2] 徐瑞兴[2] 

机构地区：[1]北京理工大学化工与材料学院,北京100081 [2]首都医科大学基础医学院化学教研室,北京100054

出　　处：《高等学校化学学报》2002年第10期1982-1987,共6页Chemical Journal of Chinese Universities

基　　金：北京市教育委员会科学研究发展计划支持项目 (批准号 :0 1KJ-0 90 )资助

摘　　要：以熔融缩聚法合成了一系列聚乙二醇 (PEG) /聚对苯二甲酸丁二醇酯 (PBT)聚醚酯热塑性弹性体 ,用NMR,FTIR,DSC及力学性能测试等方法表征了材料的结构及性能 .讨论了在相同软硬段质量配比下 ,不同软硬段长度对材料性能的影响 .结果表明 ,随着软段 PEG长度增加 ,硬段 PBT长度相应增长 ,弹性模量基本保持不变 ,抗拉强度。A series of polyether ester thermoplastic elastomers based on polyethylene glycol(PEG) and poly(butylene terephthalate)(PBT) are synthesized and characterized by means of NMR, FTIR and DSC and mechanical testing. The influence of the constant mass ratio(70/30) of soft to hard segment on the copolymers thermal and mechanical properties is investigated. It is found that, firstly, the length of hard segments is increased with increasing PEG molecular weight from 400 to 4 000(M n); secondly, four domains corresponding to the amorphous and the crystal phase of soft and hard segments coexist in some compositions; thirdly, the glass transition temperature(T g) of the soft segment is decreased, meanwhile its molten point(T m) and the degree of crystal(w c) are increased with the increase of its molecular weight; finally, the inherent viscosity changes from 1 23 to 1 64 dL/g with ascending PEG molecular weight and shows a slight depression after the molten moulding which can be ascribed to a thermooxidative degradation. All copolymers are distinguished by the high elastic deformation in the stress-strain curves. With the increase of PEG molecular weight, the elongation at break ε b, the tensile strength σ b and the yield stress σ y are all improved, while the elastic modulus E changes slightly around 9 MPa.

关 键 词：结构 表征 PEG/PBT共聚物 聚醚酯 热塑性弹性体 力学性能 

分 类 号：O633.1[理学—高分子化学] O631.2[理学—化学]