ortho-Cycloalkyl substituted N, N'-diaryliminoacenaphthene- Ni(II) catalysts for polyethylene elastomers; exploring ring size and temperature effects

doi:10.1039/c7dt03362a

	ortho-Cycloalkyl substituted N, N'-diaryliminoacenaphthene- Ni(II) catalysts for polyethylene elastomers; exploring ring size and temperature effects
	Suo, HY ; Oleynik, IV ; Huang, CB ; Oleynik, II ; Solan, GA ; Ma, YP ; Liang, TL ; Sun, WH
刊名	DALTON TRANSACTIONS
	2017-12-07
卷号	46 期号:45 页码:15684-15697
ISSN号	1477-9226
DOI	10.1039/c7dt03362a
英文摘要	A family of six unsymmetrical N,N'-diiminoacenaphthene-nickel(II) bromide complexes, [1-{2,6-(Ph2CH)(2)-4- MeC6H2N}-2-(ArN)C2C10H6] NiBr2 (Ar = 2-(C6H11)-6-MeC6H2 Ni1, 2-(C5H9)-6-MeC6H2 Ni2, 2-(C8H15)-6- MeC6H2 Ni3, 2-(C6H11)-4,6-Me2C6H2 Ni4, 2-(C5H9)-4,6-Me2C6H2 Ni5, 2-(C8H15)-4,6-Me2C6H2 Ni6), each bearing one ring-size variable 4-R-2-methyl-6-cycloalkyl-substituted N-aryl group and one N'-4-methyl- 2,6-dibenzhydrylphenyl group, have been prepared and fully characterized. The molecular structures of Ni1, Ni2, Ni3 and Ni5 reveal distorted tetrahedral geometries with different degrees of steric protection imparted by the two inequivalent N-aryl groups. On activation with either EASC or MMAO, all the precatalysts are highly active (up to 17.45 x 10(6) g PE mol(-1) (Ni) h(-1)) for ethylene polymerization at 20-50 degrees C with their activities correlating with the type of cycloalkyl ortho-substituent: cyclooctyl (Ni6, Ni3) > the cyclopentyl (Ni5, Ni2) > cyclohexyl (Ni4, Ni1) for either R = H or Me. Moderately branched to hyperbranched polyethylenes (T-m's as low as 44.2 degrees C) can be obtained with molecular weights in the range 2.14-6.68 x 10(5) g mol(-1) with the branching content enhanced by the temperature of the polymerization. Dynamic mechanical analysis (DMA) and monotonic tensile stress-strain tests have been employed on the polyethylene samples and reveal the more branched materials to show good elastic recovery properties (up to 75.5%).
语种	英语
出版者	ROYAL SOC CHEMISTRY
WOS记录号	WOS:000415989000012
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/41977]
专题	化学研究所_工程塑料实验室
作者单位	1.Solan, GA 2.Sun, WH (reprint author), Chinese Acad Sci, Inst Chem, Key Lab Engn Plast, Beijing 100190, Peoples R China. 3.Oleynik, II 4.Solan, GA 5.Sun, WH (reprint author), Chinese Acad Sci, Inst Chem, Beijing Natl Lab Mol Sci, Beijing 100190, Peoples R China. 6.Sun, WH (reprint author), Univ Chinese Acad Sci, CAS Res Educ Ctr Excellence Mol Sci, Beijing 100049, Peoples R China. 7.Oleynik, II (reprint author), NN Vorozhtsov Novosibirsk Inst Organ Chem, Pr Lavrentjeva 9, Novosibirsk 630090, Russia. 8.Solan, GA (reprint author), Univ Leicester, Dept Chem, Univ Rd, Leicester LE1 7RH, Leics, England.
推荐引用方式 GB/T 7714	Suo, HY,Oleynik, IV,Huang, CB,et al. ortho-Cycloalkyl substituted N, N'-diaryliminoacenaphthene- Ni(II) catalysts for polyethylene elastomers; exploring ring size and temperature effects[J]. DALTON TRANSACTIONS,2017,46(45):15684-15697.
APA	Suo, HY.,Oleynik, IV.,Huang, CB.,Oleynik, II.,Solan, GA.,...&Sun, WH.(2017).ortho-Cycloalkyl substituted N, N'-diaryliminoacenaphthene- Ni(II) catalysts for polyethylene elastomers; exploring ring size and temperature effects.DALTON TRANSACTIONS,46(45),15684-15697.
MLA	Suo, HY,et al."ortho-Cycloalkyl substituted N, N'-diaryliminoacenaphthene- Ni(II) catalysts for polyethylene elastomers; exploring ring size and temperature effects".DALTON TRANSACTIONS 46.45(2017):15684-15697.