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本文用磁化率、ESR 谱证实 Ni(NaPh)_2+BD+Al(i-Bu)_3体系中Ni(Ⅰ)的含量比Ni(NaPh)_2+Al(i-Bu)_2+BD体系高。两体系的动力学实验表明,Ni(Ⅰ)含量高的体系聚合活化能及催化剂利用率较高;而Ni(0)含量高的体系活化能及催化剂利用率较低。虽然两体系中Ni(Ⅰ)和Ni(0)的含量不同,但催化活性差异却不明显。因此作者认为Ni(0)与Ni(Ⅰ)都能构成活性中心,且均能使BD进行CiS-1,4聚合。
In this paper, the content of Ni (I) in Ni (NaPh) 2 + BD + Al (i-Bu) 3 system is higher than that of Ni (NaPh) 2 + Al (i- Bu) 2 + BD system by magnetic susceptibility and ESR spectrum. The kinetic experiments of the two systems show that the higher the Ni (Ⅰ) content is, the higher the polymerization activation energy and the catalyst utilization rate are. The higher Ni (0) content system activation energy and the lower catalyst utilization rate are. Although the contents of Ni (Ⅰ) and Ni (0) are different in the two systems, the difference in catalytic activity is not obvious. Therefore, the authors think that both Ni (0) and Ni (Ⅰ) can form active centers, and all of them can make BD to conduct CiS-1,4 polymerization.