中华医学超声杂志

应用化学 ›› 1989, Vol. 0 ›› Issue (1): 22-25.

• 研究论文 • 上一篇    下一篇

乙丙共物聚的结晶速率与序列结构

于旻, 张淑清, 胡宝元, 金恕   

  1. 中国科学院长春应用化学研究所
  • 收稿日期:1988-02-04 修回日期:1988-07-20 出版日期:1989-02-10 发布日期:1989-02-10

CRYSTALLIZATION RATE AND SEQUENCE STRUCTURE OF ETHYLENE-PROPYLENE COPOLYMERS

Yu Min, Zhang Shuqing, Hu Baoyuan, Jin Shu   

  1. Changchun Institute of Applied Chemistry, Academia Sinica
  • Received:1988-02-04 Revised:1988-07-20 Published:1989-02-10 Online:1989-02-10

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摘要： 本文用(体)热膨胀计法研究了共聚物组成、催化体系对乙丙共聚物结晶速率的影响。结果表明,同一催化体系乙丙共聚物的最大结晶速率(1/t(1/2)(max))随共聚物中乙烯含量的增加而增大。不同催化体系对二元乙丙共聚物的1/t(1/2)(max)次序为:VOCl3->V5-9->V(acac>)3-。加入活化剂ETCA的各催化体系的二元乙丙共聚物的1/t(1/2)(max)为VOCl3-ETCA>V5-9-ETCA>V(ocac)-ETCA。结合结晶度、Tg、以及不同序列分布共聚物组成的测定,可推测VOCl3-体系乙丙共聚物具有较长的聚乙烯序列结构,V5-9-体系次之,V(acac)3-体系的乙丙共聚物分子链有更多的无规结构。

关键词: 乙丙共聚物, 结晶速率, 序列结构, 热膨胀法

Abstract: The effects of the catalyst system and composition of ethylene-propylene copolymers onthe crystallization rates of the copolymer have been studied by dilatometry. It is shownthat for the same catalyst system, the maximum crystallisation rate 1/t1/2(max) of thecopolymer increased with the increase of the ethylene content in it.The maximum crystal-lization rates of ethylene-propylene copolymers obtained with various catalyst systemswere found in the following order:(VOCl3-)> (V5-9) > (V(acac)3-)The order of 1/t1/2(max) for the catalyst system with addition of an active agent ETCA was:(VOCl3-ETCA) > (V5-9-ETCA) > (V(acac)3-ETCA)The results of the crystallinity and glass transition temperature of the coplymers, aswell as the composition of copolymers of differnt sequence suggested that the ethylene-propylene copolymer obtained with VOCl3-had longer PE species and those obtained with V5-9- had shorter PE species. More irregular structure was formed when the copolymer isobtained with V (acac)3-catalyst system.

Key words: Ethylene-propylene copolymer, Crystallisation rate, Sequence structure, Dilatometry

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