镍系催化丁二烯聚合动力学研究 Ⅱ聚合度与链转移

Kinetics of Butadiene Polymerization with Nickel Catalyst System. Part Ⅱ. Degree of Polymerization and Chain Transfer

研究了(简称Ni—Al—B)体系催化丁二烯聚合时的链转移反应。得出只向单体(Bd)和硼化合物(B)链转移的结论。本体系所特有的聚合度方程可表示为链增长反应活化能为32.9KJ·mol^(-1)。

Chain transfers in the polymerization of butadiene with Ni(naph)_2-[Al(i-Bu)_3+Me-■- (BF_3OEt_2+n-C_8H_(17)OH) (called Ni-Al-B) catalyst system have been investigated. It is found that there exist only transfers to monomer (Bd) and boron compound (B), and that the apparent activation energy for the chain propagation is 32.9 KJ.mol^(-1). The drgree of polymerization equation in the system can be written as follows;