钒-铝体系催化丁二烯丙烯交替共聚合的动力学研究(Ⅱ)——动力学参数的测定和平均聚合度方程

A KINETIC STUDY OF ALTERNATING COPOLYMERIZATION OF BUTADIENE AND PROPYLENE BASED ON VANADIUM-ALUMINIUM CATALYST(Ⅱ)——DETERMINATION OF KINETIC PARAMETERS AND EQUATION FOR AVERAGE DEGREE OF POLYMERIZATION

本文研究了链引发、链增长和转移过程,用外推法测定了活性中心的浓度和各项动力学参数;鉴别了两种链转移及其相对贡献;根据所得实验数据建立了平均聚合度方程,并对几种方法求得的活性链平均寿命进行了讨论.

Initiation,propagation and chain transfer process of B-P alternating copolymerization were studied.We used the extrapolation to get the active center concentration and various kinetic parameters such as k_(p),k_(11),E_(p)and E_(tr)etc.We also distingushed two kinds of chain transfer processes i.e.monomer transfer andβ-H transfer and their relative contribution.According to the experimental data the equation for the average degree of polymerization may be expressed as 1/P_(n)=a[Cat][M]0x+k_(tr)/k_(p)+k_(tr)a[Cat]t/[M]0x Finally,the average life time of living polymer chain was obtained.Using different methods,the accuracy of those methods was discussed.