Active centers in propylene polymerization catalysts of the fourth generation

	Active centers in propylene polymerization catalysts of the fourth generation
	Kissin, Yury V.1; Zhou, Qian 2; Li, Huayi 3; Zhang, Liaoyun 2
刊名	JOURNAL OF CATALYSIS
	2015-12-01
卷号	332 页码:156-163
关键词	Ziegler-Natta catalysts Propylene polymerization Active center nonuniformity Stereospecificity
英文摘要	Isospecific centers in propylene polymerization catalysts of the 4th generation [combinations of solid catalysts of the TiCl4/aromatic diester/MgCl2 composition and binary cocatalysts containing Al(C2H5)(3) and methoxysilanes RnSi(OCH3)(4-n)] contain several populations of active centers, which differ in kinetic parameters and in the level of stereospecificity control. The differences in the kinetic parameters between the active centers translate into large differences in the average polymerization degree of the polymer material the centers produce, from 500-800 to 8000-17,000. Differences in the stereospecificity level between the active centers result in large differences in melting points of the polymer components. Methoxysilanes RnSi(OCH3)(4-n) directly affect each type of the polymerization center; both the kinetic parameters of the centers and their level of stereocontrol are influenced by the nature of the alkyl groups R. (C) 2015 Elsevier Inc. All rights reserved.
收录类别	SCI
语种	英语
公开日期	2016-01-19
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/29414]
专题	化学研究所_工程塑料实验室
作者单位	1.Rutgers State Univ, Dept Chem & Chem Biol, Piscataway, NJ 08854 USA 2.Univ Chinese Acad Sci, Coll Chem & Chem Engn, Beijing 100049, Peoples R China 3.Chinese Acad Sci, Inst Chem, Key Lab Engn Plast, Beijing Natl Lab Mol Sci, Beijing 100190, Peoples R China
推荐引用方式 GB/T 7714	Kissin, Yury V.,Zhou, Qian,Li, Huayi,et al. Active centers in propylene polymerization catalysts of the fourth generation[J]. JOURNAL OF CATALYSIS,2015,332:156-163.
APA	Kissin, Yury V.,Zhou, Qian,Li, Huayi,&Zhang, Liaoyun.(2015).Active centers in propylene polymerization catalysts of the fourth generation.JOURNAL OF CATALYSIS,332,156-163.
MLA	Kissin, Yury V.,et al."Active centers in propylene polymerization catalysts of the fourth generation".JOURNAL OF CATALYSIS 332(2015):156-163.