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化学学报
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化学学报 ›› 1982, Vol. 40 ›› Issue (4): 301-309. 上一篇    下一篇

论文

丁二烯在某些钕催化剂体系中聚合活性中心数的测定和动力学的研究Ⅰ.聚合条件对活性中心浓度的影响

潘恩黎, 仲崇祺, 谢德民, 欧阳均   

  1. 中国科学院长春应用化学研究所
  • 投稿日期:1980-07-18 发布日期:2013-06-03
  • 通讯作者: 潘恩黎

DETERMINATION OF ACTIVE-CENTER CONCENTRATION AND KINETIC STUDIES OF SOME NEODYMIUM CATALYSTS IN THE POLYMERIZATION OF BUTADIENE Ⅰ. INFLUENCE OF POLYMERIZATION CONDITIONS ON THE NUMBER OF ACTIVE CENTERS

PAN EN-LI, ZHONG CHONG-QI, XIE DE-MIN, OU-YANG JUN   

  1. Changchun Institute of Applied Chemistry, Academia Sinica
  • Received:1980-07-18 Published:2013-06-03

PDF

360

被引次数

24

本文应用氘醇淬灭法测定了钕化合物-烷基铝-丁二烯聚合体系的活性中心浓度.对五种钕化合物和三种烷基铝所组成的不同催化剂体系进行测定的结果表明:其活性中心浓度在0.004～0.08mol/molNd内变化.本文还研究了聚合条件及催化剂组成对活性中心浓度及增长速度常数的影响.结果表明:增长速度常数不随烷基铝及钕化合物的种类而变化,因此,对于不同组成的催化剂,其聚合活性的差别主要在于活性中心浓度的变化.

The tritiated alcohol quench method has been used for determining the number of active centers in the polymerisation systems of Nd compounds-A1 (i-Bu)2Cl-A1Rsub>3-butadiene.The number of active centers in this polymerization systems has been shown to lie in the range of 0.004-0.08 mol/mol Nd for catalytic systems in which five neodymium compounds and two aluminium alkyls reacted with each other.In the present study the influence of polymerization condition and catalyst composition on active centers and propagation rate constants were investigated.The data obtained show that the propagation rate constant does not depend on the nature of A1R3 and Nd compounds.Thus,it can be concluded that the difference observed in catalyst activities is related to the number of active centers formed.