东北大学学报（自然科学版）

东北大学学报(自然科学版) ›› 2007, Vol. 28 ›› Issue (6): 909-912.DOI: -

• 论著 • 上一篇    

间同1;2-聚丁二烯的结构和结晶动力学研究

卢军;胡雁鸣;张学全;黄葆同;   

  1. 东北大学理学院;中国科学院长春应用化学研究所;中国科学院长春应用化学研究所;东北大学理学院 辽宁沈阳110004;吉林长春130022;吉林长春130022;辽宁沈阳110004;中国科学院长春应用化学研究所;吉林长春130022
  • 收稿日期:2013-06-24 修回日期:2013-06-24 出版日期:2007-06-15 发布日期:2013-06-24
  • 通讯作者: Lu, J.
  • 作者简介:-
  • 基金资助:
    国家自然科学基金资助项目(20274046)

Structure and non-isothermal crystallization kinetics of syndiotactic 1, 2-polybutadiene

Lu, Jun (1); Hu, Yan-Ming (2); Zhang, Xue-Quan (2); Huang, Bao-Tong (1)   

  1. (1) School of Sciences, Northeastern University, Shenyang 110004, China; (2) Changchun Institute of Applied Chemistry, Chinese Acad. of Sci., Changchun 130022, China
  • Received:2013-06-24 Revised:2013-06-24 Online:2007-06-15 Published:2013-06-24
  • Contact: Lu, J.
  • About author:-
  • Supported by:
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摘要： 间同1,2-聚丁二烯(s-PB)由丁二烯用Fe(2-EHA)3/Al(i-Bu)3/DEP作催化剂,在己烷溶剂中50℃下聚合制备.用13C NMR谱方法测定的1,2-结构含量为89.3%,间同结构为86.5%;X射线测得聚合物的结晶度约为68%.非等温结晶动力学研究采用DSC方法,改进的Avrami方程可以很好地分析s-PB非等温结晶过程的主期结晶,表明其结晶过程是自成核,三维球形生长.Ozawa方程不适合分析s-PB非等温结晶动力学;Avrami和Ozawa方程结合的方法可以很好地描述s-PB非等温结晶过程,指数a为1.138,F(θ)随着结晶度的提高而增大;并计算了s-PB的结晶活化能.

关键词: 非等温结晶动力学, 间同1, 2-聚丁二烯, 铁系催化剂, 差热扫描, 结晶活化能

Abstract: Syndiotactic 1, 2-polybutadiene(s-PB) was prepared taking Fe(2-EHA)3/Al(i-Bu)3/DEP as catalyst in hexane at 50°C. Characterized by 13C NMR measurement, the contents of 1, 2-structure and syndiotacticity of production are 89.3% and 86.5%, respectively, and the crystallinity is about 68%. Differential scanning calorimetry (DSC) was introduced on relevant non-isothermal crystallization kinetics, and the modified Avrami analysis showed that the Avrami exponent varies from 2.73-3.22 in primary stage, thus indicating that the crystallization behavior of s-PB is a thermal or athermal self-nucleation growing in three-dimensional spherulization. The Ozawa equation was proved that it fails to describe the non-isothermal crystallization process. However, combining the Avrami and Ozawa equations together can describe the non-isothermal crystallization process well, which shows that the exponent a is 1.138, and F(θ) increases with crystallinity. The effective energy barrier was also calculated.

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