波谱学杂志 ›› 1998, Vol. 15 ›› Issue (1): 77-82.

• 研究论文 • 上一篇    下一篇

EV共聚物序列中的两种结构因素

周子南, 田文晶, 冯之榴   

  1. 中国科学院长春应用化学研究所高分子物理开放实验室, 长春 130022
  • 收稿日期:1997-08-19 修回日期:1997-09-18 出版日期:1998-02-05 发布日期:2018-01-13
  • 作者简介:周子南,男,55岁,硕士,研究员

TWO CONSTITUTIONAL FACTORS IN THE SEQUENCE OF EV COPOLYMERS

Zhou Zinan, Tian Wenjing, Feng Zhiliu   

  1. Laboratory of Polymer Physics, Changchun Institute of Applied Chemistry, the Chinese Academy of Sciences, Changchun 130022
  • Received:1997-08-19 Revised:1997-09-18 Online:1998-02-05 Published:2018-01-13

摘要: 系统描述了EV共聚物序列中两种结构因素对共聚物主链中亚甲基和次甲基13C NMR化学位移的贡献,将SCS方法与半经验方法结合起来,阐明了常数项δLEδ0的物理意义,提出了以聚乙烯链反式构象化学位移δt为基准计算上述亚甲基和次甲基化学位移的公式:δc=δtniSiPjγj
并在此基础上,讨论了聚乙烯,聚丙烯的特殊情况和乙丙共聚物的链结构.

关键词: EV共聚物, 13C NMR, SCS方法, 半经验方法, 链结构

Abstract: In this paper the contribution of two constitutional factors in the sequence of EV copolymers to the 13C NMR chemical shift of methylene and methine in copolymer chain structure is describedsy stematically.
The SCS method and the semiempirical method are combined perfectly. The physical meaning of parameters δLE and δ0 are explained clearly. On the basis of the parameter δt which is the chemical shift of the trans conformation of polyethylene chan, formula(6) is suggested for the calculation of 13C NMR chemical shift of methylene and methine in EV copolymers.
δc=δtniSiPjγj
Based on formula (6), the sequences of polyethylene, polypropylene and ethylenevinyl copolymers are discussed respectively.

Key words: Ethylene-Vinyl Co polymers, 13C NMR, Substituent chemical shift method(SCS), Semiempirical method, Chain structure