Post-functionalization of narrowly dispersed PE waxes generated using tuned N,N,N′-cobalt ethylene polymerization catalysts substituted with ortho-cycloalkyl groups

Post-functionalization of narrowly dispersed PE waxes generated using tuned N,N,N′-cobalt ethylene polymerization catalysts substituted with ortho-cycloalkyl groups Full article

Journal

Polymer
ISSN: 0032-3861 , E-ISSN: 1873-2291

Output data

Year: 2021, Volume: 213, Article number : 123294, Pages count : DOI: 10.1016/j.polymer.2020.123294

Tags

bis(arylimino)trihydroquinolyl-cobalt precatalyst; Catalyst thermostability; Ethylene polymerization; Polyethylene waxes; Post-functionalization

Authors

Suo Hongy ^1,2 , Oleynik Irina V. ³ , Oleynik Ivan I. ³ , Solan Gregory A. ^1,4 , Ma Yanping ^1,5 , Liang Tongling ¹ , Sun Wen-Hua ^1,5

Affiliations

1	Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, China
2	Department College of Chemistry and Chemical Engineering, Yantai University, 30 Qingquan Road, Yantai, Shandong 264005, China
3	N.N. Vorozhtsov Novosibirsk Institute of Organic Chemistry, Pr. Lavrentjeva 9, Novosibirsk630090, Russian Federation
4	Department of Chemistry, University of Leicester, University Road, Leicester, LE1 7RH, United Kingdom
5	State Key Laboratory for Oxo Synthesis and Selective Oxidation, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, 730000, China

Six structurally related bis(arylimino)trihydroquinolyl-cobalt (II) chloride complexes [2-(ArN[dbnd]CCH3)-8-(ArN)-5,6,7-C9H8N]CoCl2 (Ar = 2-(C5H9)-6-MeC6H3 Co1, 2-(C6H11)-6-MeC6H3 Co2, 2-(C8H15)-6-MeC6H3 Co3, 2-(C5H9)-4,6-Me2C6H2 Co4, 2-(C6H11)-4,6-Me2C6H2 Co5, 2-(C8H15)-4,6-Me2C6H2 Co6), distinguishable by the ring size of the ortho-cycloalkyl substituent and type of para-R group, have been synthesized and characterized. A distorted square pyramidal geometry is a feature of the molecular structure of Co4 with the two ortho-cyclopentyl groups located on neighboring N-aryl groups trans-configured. Compounds Co1 – Co6, on activation with methylaluminoxane (MAO) or modified MAO (MMAO), proved highly productive catalysts for ethylene polymerization at 60 °C [up to 17.1 × 106 g (PE) mol−1(Co) h−1 for cyclopentyl-containing Co4/MAO]; even at 90 °C significant activity was attainable (up to 6.75 × 106 g (PE) mol−1(Co) h−1). Strictly linear polyethylene waxes of low molecular weight (ca. 1.50 kg mol−1), narrow dispersity (Mw/Mn range: 1.1–2.4) and incorporating high levels of vinyl end-groups were generated. Post-functionalization of these PE waxes by epoxidation, thiol-ene addition and cross-olefin metathesis to form e-PE, PE-S-CH2CH2NH2·HCl and PE-MMA, respectively, has been demonstrated. For comparative purposes, [2-(ArN[dbnd]CCH3)-8-ArN-5,6,7-C9H8N]CoCl2 (Ar = 2,4,6-Me3C6H2 Coo-Me, 2-(Ph2CH)-4,6-Me2C6H2 Coo-CHPh2) have also been prepared and evaluated as polymerization catalysts. © 2020

Suo H. , Oleynik I.V. , Oleynik I.I. , Solan G.A. , Ma Y. , Liang T. , Sun W-H.
Post-functionalization of narrowly dispersed PE waxes generated using tuned N,N,N′-cobalt ethylene polymerization catalysts substituted with ortho-cycloalkyl groups
Polymer. 2021. V.213. 123294 . DOI: 10.1016/j.polymer.2020.123294 WOS Scopus РИНЦ

Published print:

Jan 1, 2021

Web of science	WOS:000608417900003
Scopus	2-s2.0-85097913151
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