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Title: Molecular weight control of polyethylene waxes using a constrained imino-cyclopenta[b]pyridyl-nickel catalyst
Authors: Wang, Zheng
Zhang, Youfu
Ma, Yanping
Hu, Xinquan
Solan, Gregory A.
Sun, Yang
Sun, Wen-Hua
First Published: 11-Aug-2017
Publisher: Wiley
Citation: Journal of Polymer Science Part A: Polymer Chemistry, 2017, 55 (20), pp. 3494-3505
Abstract: Five examples of nickel(II) bromide complexes bearing N,N-imino-cyclopenta[b]pyridines, [7-(ArN)-6,6-Me 2 C 8 H 5 N]NiBr 2 (Ar=2,6-Me 2 C 6 H 3 (Ni1), 2,6-Et 2 C 6 H 3 (Ni2), 2,6-i-Pr 2 C 6 H 3 (Ni3), 2,4,6-Me 3 C 6 H 2 (Ni4), 2,6-Et 2 -4-MeC 6 H 2 (Ni5)), have been prepared by the reaction of the corresponding ligand, L1-L5, with NiBr 2 (DME) (DME=1,2-dimethoxyethane). On crystallization from bench dichloromethane, Ni1 underwent adventitious reaction with water to give the aqua salt, [L1NiBr(OH 2 ) 3 ][Br] (Ni1'). The molecular structures of Ni1' and Ni3 have been structurally characterized, the latter revealing a bromide-bridged dimer. On activation with either MMAO or Et 2 AlCl, Ni1, Ni2, Ni4, and Ni5, all exhibited high activities for ethylene polymerization (up to 3.88 × 10 6 g(PE) mol -1 (Ni) h -1 ); the most sterically bulky Ni3 gave only low activity. Polyethylene waxes are a feature of the materials obtained which typically display low molecular weights (M w s), narrow M w distributions and unsaturated vinyl and vinylene functionalities. Notably, the catalyst comprising Ni1/Et 2 AlCl produced polyethylene with the lowest M w , 0.67 kg mol -1 , which is less than any previously reported data for any class of cycloalkyl-fused pyridine-nickel catalyst.
DOI Link: 10.1002/pola.28732
ISSN: 0887-624X
eISSN: 1099-0518
Embargo on file until: 1-Aug-2018
Version: Post-print
Status: Peer-reviewed
Type: Journal Article
Rights: Copyright © 2017, Wiley. Deposited with reference to the publisher’s open access archiving policy.
Description: The file associated with this record is under embargo until 12 months after publication, in accordance with the publisher's self-archiving policy. The full text may be available through the publisher links provided above.
Appears in Collections:Published Articles, Dept. of Chemistry

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