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间同1;2-聚丁二烯的结构和结晶动力学研究
引用本文:卢军,胡雁鸣,张学全,黄葆同.间同1;2-聚丁二烯的结构和结晶动力学研究[J].东北大学学报(自然科学版),2007,28(6):909-912.
作者姓名:卢军  胡雁鸣  张学全  黄葆同
作者单位:1. 东北大学,理学院,辽宁,沈阳,110004
2. 中国科学院,长春应用化学研究所,吉林,长春,130022
3. 东北大学,理学院,辽宁,沈阳,110004;中国科学院,长春应用化学研究所,吉林,长春,130022
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  
文章编号:1005-3026(2007)06-0909-04
修稿时间:2006-06-06

Structure and Non-isothermal Crystallization Kinetics of Syndiotactic 1,2-Polybutadiene
LU Jun,HU Yan-ming,ZHANG Xue-quan,HUANG Bao-tong.Structure and Non-isothermal Crystallization Kinetics of Syndiotactic 1,2-Polybutadiene[J].Journal of Northeastern University(Natural Science),2007,28(6):909-912.
Authors:LU Jun  HU Yan-ming  ZHANG Xue-quan  HUANG Bao-tong
Affiliation:1. School of Sciences, Northeastern University, Shenyang 110004, China; 2. Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
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.
Keywords:non-isothermal crystallization kinetics  syndiotactic 1  2-polybutadiene  iron catalyst  differential scanning calorimetry(DSC)  activation energy of crystallization
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