摘要
氢气在聚乙烯装置及聚丙烯装置中对催化剂活性的作用是截然不同的。在乙烯聚合中,随着氢气浓度的增加,催化剂活性和聚合物分子量明显下降,分子量分布变窄;而在丙烯聚合中,随氢气浓度的增加,虽然聚合物分子量下降,但是催化剂的活性却有明显增加。这个结论在许多Z-N催化剂催化烯烃聚合的文献报道中已被证实,但具体作用机理鲜有报道。文章总结了多篇关于丙烯及乙烯聚合的相关报道,推断出氢气对乙烯聚合及丙烯聚合的不同作用机理的可能性。
Abslract： The effects of hydrngen on catalytic activity in polyethylene device and polypropylene device are completely different. During the polymerization of ethylene, the catalyst activity and MW of polymer decrease with the increase of hydrogen concentration, and the MW range narrows down. While polymerizing propylene, although the MW of polymer decreases with the increase of hydrogen concentration, the catalyst activity increases significantly. This conclusion has been confirmed in many literatures about Z-N catalysts effecting on olefin polymerization, but the exact action mechanism has been rarely reported. This paper summarizes several articles on the polymerization of ethylene and propylene, inferring the possibility that the functional mechanisms of hydrogen polymerizing ethylene and propylene are different. Keywords： polyethylene; polypropylene~ Zigler-Nattacatalyst; hydrogen
出处
《广东化工》
CAS
2013年第21期95-96,110,共3页
Guangdong Chemical Industry
