中华医学超声杂志

应用化学 ›› 1992, Vol. 0 ›› Issue (2): 111-114.

• 研究简报 • 上一篇    下一篇

嵌段聚酯型聚脲氨酯弹性体的动态力学性能

郭晓战, 赵根锁, 张黄立   

  1. 河南化学研究所, 郑州 450003
  • 收稿日期:1991-05-21 修回日期:1991-08-26 出版日期:1992-04-10 发布日期:1992-04-10

DYNAMIC MECHEMICAL PROPERTIES OF SEGMENTED POLYESTER POLYURETHANEUREA ELASTOMERS

Guo Xiaozhan, Zhao Gensuo, Zhang Huangli   

  1. Henan Institute of Chemistry, Zhengzhou 450003
  • Received:1991-05-21 Revised:1991-08-26 Published:1992-04-10 Online:1992-04-10

PDF

425

被引次数

1

摘要： 聚氨酯(PU)的微区结构和宏观力学性能之间的关系是PU的一个重要课题[1∼4]。本文用动态力学方法对基于4,4′-二苯基甲烷二异氰酸酯(MDI),乙二胺(ED)和聚已二酸丁二醇(PBA)的嵌段聚酯型聚脲氨酯(PUU)弹性体进行了研究,探讨了不同软段分子量和硬段含量对PUU动态力学性能的影响,对E-T图谱上出现的"多阶橡胶平台"现象进行了解释。

关键词: 聚酯型聚脲氨酯, 动态力学性能, 松弛, 相分离

Abstract: The dynamic mechanical properties of the segmented polyester polyurcthaneurea (PUU) elastomcrs based on 4,4'-diphenylmethane diisocyanate (MDI), ethylene diamine (ED) and polybutylene adipate (PBA) (mol. wt. of 1975 and 1228) have been studied. The results showed that PUU exhibited a two phase structure, and two major transitions corresponding to the soft and hard segments were observed. Several secondary relaxations were also observed. All the relaxations were affected by both the molecular weight of the soft segments and content of the hard segments. The degree of the phase segregation may be improved by increasing the hard segment content. There occured a multi-step rubbery platform in E～T curves. A model has been proposed for reasonable explanation for the existence of the multi-step platforms.

Key words: polyester polyurethaneurea, dynamic mechanical property, relaxation, phase segregation

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