A highly active neodymium chloride isopropanol complex/modified methylaluminoxane catalyst for preparing polyisoprene with high cis-1,4 stereospecificity and narrow molecular weight distribution

	A highly active neodymium chloride isopropanol complex/modified methylaluminoxane catalyst for preparing polyisoprene with high cis-1,4 stereospecificity and narrow molecular weight distribution
	Li GL ; Ren CY ; Dong WM ; Jiang LS ; Zhang XQ ; Wang FS
刊名	chinese journal of polymer science
	2010
卷号	28 期号:2 页码:157-164
关键词	CONTROLLED ISOPRENE POLYMERIZATION 1 1 DIENE POLYMERIZATION 3-BUTADIENE 3-DIENES LANTHANIDE CATALYSTS BUTADIENE SYSTEMS COPOLYMERIZATION LIGAND
ISSN号	0256-7679
通讯作者	dong wm
中文摘要	neodymium chloride isopropanol complex (ndcl3 center dot 3 (i) proh) activated by modified methylaluminoxane (mmao) was examined in isoprene polymerization in hexane, with regards to nd compounds, aluminum (al) compounds, [al]/[nd] ratio, polymerization temperature and time. ndcl3 center dot 3 (i) proh exhibited high activity producing polymers featuring high cis-1,4 stereospecificity (> 96%), very high molecular weight (mn > 1.0 x 106) and fairly narrow molecular weight distribution (mwd, mw/mn < 2.0) simultaneously. in comparison, neodymium isopropoxide also showed high activity providing polymers with narrow mwd (mw/mn = 2.07), but somewhat low cis-1,4 content (ca. 92%), while neodymium chloride had no activity under present polymerization conditions. the al compounds affected the polymer yield in the order of al(i- bu)(3) > mmao > al(i-bu)(2)h. mmao as cocatalyst afforded polyisoprene with high mn over 1.0 x 106, whereas as stronger chain transfer agent than mmao, al(i-bu)(3) and al(i-bu)(2)h yielded polymers with low mn (1.0 x 10(5)-8.0 x 105). ndcl3 center dot 3 (i) proh/mmao catalyst showed a fairly good catalytic activity even at relatively low [al]/[nd] ratio of 30, and the produced polymer remained high cis-1,4 content of 95.8% along with high mn over 1.0 x 106 even at elevated temperatures up to 70a degrees c. the polymerization rate is of the first order with respect to the concentration of isoprene. the mechanism of active species formation was discussed preliminarily.
收录类别	SCI收录期刊论文
语种	英语
WOS记录号	WOS:000274500600003
公开日期	2012-06-07
内容类型	期刊论文
源URL	[http://ir.ciac.jl.cn/handle/322003/43921]
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	Li GL,Ren CY,Dong WM,et al. A highly active neodymium chloride isopropanol complex/modified methylaluminoxane catalyst for preparing polyisoprene with high cis-1,4 stereospecificity and narrow molecular weight distribution[J]. chinese journal of polymer science,2010,28(2):157-164.
APA	Li GL,Ren CY,Dong WM,Jiang LS,Zhang XQ,&Wang FS.(2010).A highly active neodymium chloride isopropanol complex/modified methylaluminoxane catalyst for preparing polyisoprene with high cis-1,4 stereospecificity and narrow molecular weight distribution.chinese journal of polymer science,28(2),157-164.
MLA	Li GL,et al."A highly active neodymium chloride isopropanol complex/modified methylaluminoxane catalyst for preparing polyisoprene with high cis-1,4 stereospecificity and narrow molecular weight distribution".chinese journal of polymer science 28.2(2010):157-164.