高等学校化学学报

高等学校化学学报 ›› 2000, Vol. 21 ›› Issue (10): 1584.

• 论文 • 上一篇    下一篇

低乙烯含量共聚聚丙烯链结构和相结构与应力应变行为的关系

马德柱, 陈卫国, 郝文涛, 张忠平, 罗筱烈   

  1. 中国科学技术大学高分子材料与科学系, 合肥 230026
  • 收稿日期:1999-08-02 出版日期:2000-10-24 发布日期:2000-10-24
  • 通讯作者: 马德柱(1936年出生),男,教授,博士生导师.主要从事高分子晶体结构与高分子合金方面的研究.
  • 基金资助:

    国家自然科学基金(批准号:29170190);国家科学技术委员会基础研究重大关键项目资助

The Relationship Between Chain Structure and Phase Structure and Tensile Stress-Strain Behavior of Copolymer Polypropylene with Low Ethylene Content

MA De-Zhu, CHEN Wei-Guo, HAO Wen-Tao, ZHANG Zhong-Ping, LUO Xiao-Lie   

  1. Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei 230026, China
  • Received:1999-08-02 Online:2000-10-24 Published:2000-10-24

PDF (PC)

被引次数

15

摘要： 研究了两种典型的低温抗冲共聚聚丙烯(ICPP)的应力应变行为及温度依赖性,其低温应力应变行为揭示ICPP具有优异的低温抗冲性能和综合力学性能的结构本质.从初始弹性模量、屈服应力及断裂伸长随温度变化所显示的变化规律进一步确认了两种ICPP的序列结构特征和相结构特征.断裂伸长变化显示了乙丙橡胶相的增韧作用,屈服应力变化显示了分散相对基质结合紧密程度的影响,弹性模量则与基质的结晶状况和结晶形态有着比较密切的关系,同时也与乙丙橡胶相和聚丙烯基质的玻璃化转变温度密切相关.

关键词: 共聚聚丙烯, 应力应变行为, 低温抗冲性能

Abstract: In our published works, it has been proved that the impact copolymer polypropylene(ICPP) has characteristic chain structure and phase structure which make CPPexhibit excellent low-temperature impact strength. The tensile stress-strain behavior at low-temperature of impact copolymer polypropylene strongly discloses the structure nature why impact copolymer polypropylene has so excellent low-temperature impact strength and comprehensive mechanical properties. The dependence of Young′s modulus, stress yield and the elongation at break on the variation of the temperature can be explained by the characteristic chain structure and characteristic phase structure of the impact copolymer polypropylene. The difference of the elongation at break between the homopolymer and copolymer indicates that ethylene-propylene rubber acts as the toughening phase in the impact copolymer polypropylene. The difference of stress yield between the two-copolymer polypropylenes comes from the difference of the adhesion between the rubber particles and the matrix PP. The Young′s modulus is closely related to the crystallinity of the matrix PP, the size of the spherulite and the size distribution, and the glass transition temperature of both ethylene-propylene rubber and PPmatrix can also give important influence on it.

Key words: Copolymer polypropylene, Stress-strain behavior, Low-temperature impact-resistance

中图分类号: 

TrendMD: