高等学校化学学报

高等学校化学学报 ›› 2002, Vol. 23 ›› Issue (10): 1982.

• 研究论文 • 上一篇    下一篇

相同软硬段质量配比聚醚酯弹性体PEG/PBT的结构与表征

张勇1, 叶玲2, 冯增国1, 张爱英1, 田小娟2, 徐瑞兴2   

  1. 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
  • 收稿日期:2001-11-29 出版日期:2002-10-24 发布日期:2002-10-24
  • 通讯作者: 冯增国(1957年出生),男,研究员,主要从事生物医用高分子材料研究.E-mail:sainfeng@95777.com E-mail:sainfeng@95777.com
  • 基金资助:

    北京市教育委员会科学研究发展计划支持项目(批准号:01KJ-090)资助

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

ZHANG Yong1, YE Ling2, FENG Zeng-Guo1, ZHANG Ai-Ying1, TIAN Xiao-Juan2, XU Rui-Xing2   

  1. 1. School of Chemical Engineering and Materials Science, Beijing Institute of Technology, Beijing 100081, China;
    2. School of Primary Medicine, Capital Medical University, Beijing 100054, China
  • Received:2001-11-29 Online:2002-10-24 Published:2002-10-24

PDF (PC)

被引次数

43

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、屈服应力及特性粘度增加.

关键词: PEG/PBT共聚物, 聚醚酯热塑性弹性体, 力学性能

Abstract: 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(Mn); 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(Tg) of the soft segment is decreased, meanwhile its molten point(Tm) and the degree of crystal(wc) 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 εb, the tensile strength σb and the yield stress σy are all improved, while the elastic modulus E changes slightly around 9 MPa.

Key words: PEG/PBT copolymer, Thermoplastic elastomer, Mechanical properties

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