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提高甲基氨酸的性能:一种简单有效的方法来捕获"自由"的三甲基

Vincenzo Busico¹, Roberta Cipullo, Francesco Cutillo

¹Dipartimento di Chimica, Università di Napoli "Federico II", Via Cintia, 80126 Naples, Italy. busico@chemistry.unina.it

Journal of the American Chemical Society

|October 9, 2003

概括

一种新方法使用2,6-di-tert-butylphenol来捕获在甲基 (MAO) 溶液中的自由三甲基 (TMA). 这提高了烯酸聚合催化剂的性能,从而提高了生产率和更好的聚合物特性.

科学领域:

聚合物化学聚合物化学
有机金属化学有机金属化学
催化剂是一种催化剂.

背景情况:

在甲基 (MAO) 溶液中的自由三甲基 (TMA) 对烯酸聚合催化剂产生负面影响.
目前用于TMA去除的方法,如溶剂蒸发,是低效的,危险的,并可能导致TMA再生.
固体MAO具有较差的溶解性,在重新溶解时可以释放TMA.

研究的目的:

开发一种简单有效的方法,从MAO溶液中去除有害的自由TMA.
调查使用性阻碍醇作为TMA清洁剂的情况.
为了评估被修改MAO在olefin聚合中激活的催化剂的性能.

主要方法:

在MAO溶液中控制添加2,6-di-tert-butylphenol以捕获自由的TMA.
使用 2,6-di-tert-butylphenol/MAO 混合物激活conocene 和 bis ((phenoxyimine) Ti 催化剂前体.
烯聚合实验以评估催化剂性能.

主要成果:

2,6-di-tert-butylphenol有效地清除自由的TMA,形成稳定的添加物.
与2,6-di-tert-butylphenol/MAO激活的催化剂,与单独使用MAO的催化剂相比,表现出类似或更高的激活.
使用这些修改系统的烯聚合导致了显著更高的生产率,改善了聚合物立体规律性,并增加了平均分子质量.

结论:

固态阻断的,特别是2,6-di-tert-butylphenol,为中和MAO中的自由TMA提供了一个实际的解决方案.
这种方法提高了烯酸聚合物的催化剂性能,从而获得了优越的聚合物特性.
2,6-di-tert-butylphenol/MAO系统为传统的MAO激活方法提供了一个可行的和有利的替代方案.

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