烯类化合物在自由基、阴离子或阳离子共聚中,表征单体反应活性比的竟聚率主要依赖于链增长机理,而在配位聚合中,竞聚率不但依赖于链增长,而且还依赖于单体在催化剂中心金属原子上的配位。关于这方面的工作,文献已有不少报道。Carrick发现,当用各种过渡金属盐和烷基铝组成的催化剂对乙烯-丙烯共聚时,丙烯的竞聚率按下列次序 In free-radical, anionic or cationic copolymerization of vinyls, the rate of aggregation that characterizes the ratio of monomer reactivity depends mainly on the chain growth mechanism, whereas in coordination polymerization, the rate of reactivity depends not only on chain growth but also on Coordination of monomers on the metal atom of catalyst center. There have been many reports on this topic. Carrick found that when ethylene-propylene is copolymerized with catalysts composed of various transition metal salts and aluminum alkyls, the reactivity ratio of propylene is in the following order