Preparation of High cis-1,4 Polyisoprene with Narrow Molecular Weight Distribution via Coordinative Chain Transfer Polymerization

	Preparation of High cis-1,4 Polyisoprene with Narrow Molecular Weight Distribution via Coordinative Chain Transfer Polymerization
	Fan CL ; Bai CX ; Cai HG ; Dai QQ ; Zhang XQ ; Wang FS
刊名	journal of polymer science part a-polymer chemistry
	2010
卷号	48 期号:21 页码:4768-4774
关键词	OLEFIN BLOCK-COPOLYMERS 1 ISOPRENE POLYMERIZATION 3-BUTADIENE LIVING POLYMERIZATION SHUTTLING POLYMERIZATION RADICAL POLYMERIZATION DIBLOCK COPOLYMERS METAL-COMPLEXES CATALYST STYRENE
ISSN号	0887-624x
通讯作者	zhang xq
中文摘要	high cis-1,4 polyisoprene with narrow molecular weight distribution has been prepared via coordinative chain transfer polymerization (cctp) using a homogeneous rare earth catalyst composed of neodymium versatate (nd(vers)(3)), dimethyldichlorosilane (me2sicl2), and diisobutylaluminum hydride (al(i-bu)(2)h) which has strong chain transfer affinity is used as both cocatalyst and chain transfer agent (cta). differentiating from the typical chain shuttling polymerization where dual-catalysts/csa system has been used, one catalyst/cta system is used in this work, and the growing chain swapping between the identical active sites leads to the formation of high cis-1,4 polyisoprene with narrowly distributed molecular weight. sequential polymerization proves that irreversible chain termination reactions are negligible. much smaller molecular weight of polymer obtained than that of stoichiometrically calculated illuminates that, differentiating from the typical living polymerization, several polymer chains can be produced by one neodymium atom. the effectiveness of al(i-bu)(2)h as a cta is further testified by much broad molecular weight distribution of polymer when triisobutylaluminum (al(i-bu)(3)), a much weaker chain transfer agent, is used as cocatalyst instead of al(i-bu)(2)h. finally, cctp polymerization mechanism is validated by continuously decreased m-w/m-n value of polymer when increasing concentration of al(i-bu)(2)h extra added in the nd(ver)(3)/me2sicl2/al(i-bu)(3) catalyst system. (c) 2010 wiley periodicals, inc. j polym sci part a: polym chem 48: 4768-4774, 2010
收录类别	SCI收录期刊论文
语种	英语
WOS记录号	WOS:000283609800016
公开日期	2012-04-25
内容类型	期刊论文
源URL	[http://ir.ciac.jl.cn/handle/322003/43316]
专题	长春应用化学研究所_长春应用化学研究所知识产出_期刊论文
推荐引用方式 GB/T 7714	Fan CL,Bai CX,Cai HG,et al. Preparation of High cis-1,4 Polyisoprene with Narrow Molecular Weight Distribution via Coordinative Chain Transfer Polymerization[J]. journal of polymer science part a-polymer chemistry,2010,48(21):4768-4774.
APA	Fan CL,Bai CX,Cai HG,Dai QQ,Zhang XQ,&Wang FS.(2010).Preparation of High cis-1,4 Polyisoprene with Narrow Molecular Weight Distribution via Coordinative Chain Transfer Polymerization.journal of polymer science part a-polymer chemistry,48(21),4768-4774.
MLA	Fan CL,et al."Preparation of High cis-1,4 Polyisoprene with Narrow Molecular Weight Distribution via Coordinative Chain Transfer Polymerization".journal of polymer science part a-polymer chemistry 48.21(2010):4768-4774.