高等学校化学学报

高等学校化学学报 ›› 2001, Vol. 22 ›› Issue (2): 303.

• 研究论文 • 上一篇    下一篇

物理老化无规聚苯乙烯屈服机理的研究

宋锐, 赵军, 杨娟, 令狐欣, 高金贵, 范庆荣   

  1. 高分子物理与化学国家重点实验室, 分子科学中心, 中国科学院化学研究所, 北京 100080
  • 收稿日期:1999-08-18 出版日期:2001-02-24 发布日期:2001-02-24
  • 通讯作者: 范庆荣(1941年出生),男,研究员,主要从事高分子物理研究.
  • 基金资助:

    国家基础研究重大项目“高分子凝聚态基本物理问题研究”资助

A Study of Stress-Yielding Mechanism of Aged Atactic Polystyrene

SONG Rui, ZHAO Jun, YANG Juan, LING-HU Xin, GAO Jin-Gui, FAN Qing-Rong   

  1. State Key Laboratory of Polymer Physics & Chemistry, Center for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, China
  • Received:1999-08-18 Online:2001-02-24 Published:2001-02-24

PDF (PC)

被引次数

11

摘要： 利用机械拉伸、示差扫描量热(DSC)以及溶剂溶胀等方法研究了物理老化后的无规聚苯乙烯(α-PS)的应力屈服行为,并从凝聚缠结的观点对实验结果进行了解释.实验结果表明,经物理老化后的α-PS在拉伸过程中出现应力屈服峰实质上是逐步打开凝聚缠结的过程.凝聚缠结是聚合物非晶相在物理老化过程中相邻的两三条链的局部链段由于范德华吸引力的作用形成的一种有序结构,其作用能很弱,升温至Tg附近,机械拉伸至屈服点以及溶胀剂都可将其完全破坏.

关键词: 无规聚苯乙烯, 应力屈服, 凝聚缠结

Abstract: The stess yielding mechanism of aged atactic polystyrene(α-PS) was studied by use of mechanical tension, differential scanning calorimetry(DSC) and solvent-swelling. The viewpoint of cohensional entaglement(CE) was empolyed to interpret the experimental results, which indicated that the stress yielding of aged α-PSwas the destruction of the CEformed during aging. CEwas a kind of ordered structure, which was formed by local parallel alignment of several segments of several nearest neighboring chains. Its interaction energy was so low that heating beyond theTg region, mechanical drawing over the yield point and solvent swelling all could destroy it completely.

Key words: Atactic polystyrene, Stress yielding, Cohensional entanglement

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