Synthesis of Branched Cyclo-Olefin Copolymers Using Neutral <i>α</i>-Sulfonate-<i>β</i>-Diimine Nickel Catalyst

Synthesis of Branched Cyclo-Olefin Copolymers Using Neutral <i>α</i>-Sulfonate-<i>β</i>-Diimine Nickel Catalyst

The homopolymerization of norbornene and the copolymerization of norbornene and ethylene were carried out using the neutral <i>α</i>-sulfonate-<i>β</i>-diimine nickel catalyst <b>SD-Ni</b>. The neutral <i>α</i>-sulfonate-<i>β</i>-diimine ca...

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Bibliographic Details
Main Authors: Donghui Li, Lixia Pei, Wenbo Du, Xieyi Xiao, Heng Gao, Handou Zheng, Haiyang Gao
Format: Article
Language:English
Published: MDPI AG 2025-01-01
Series:Molecules
Subjects:
cyclo-olefin copolymer
norbornene
ethylene
nickel catalyst
copolymerization
Online Access:https://www.mdpi.com/1420-3049/30/1/157
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Summary:The homopolymerization of norbornene and the copolymerization of norbornene and ethylene were carried out using the neutral <i>α</i>-sulfonate-<i>β</i>-diimine nickel catalyst <b>SD-Ni</b>. The neutral <i>α</i>-sulfonate-<i>β</i>-diimine catalyst is highly active in the homopolymerization of norbornene, producing vinyl-addition polynorbornene (PNB) with a high molecular weight. The copolymerization of norbornene (NB) and ethylene (E) using the catalyst <b>SD-Ni</b> was also investigated. The <i>α</i>-sulfonate-<i>β</i>-diimine catalyst <b>SD-Ni</b> shows distinctive catalytic copolymerization properties to produce high-molecular-weight E-NB copolymers with low norbornene incorporation. Importantly, microstructure analyses confirm that the resultant E-NB copolymers are branched cyclo-olefin copolymers (COCs) with branched polyethylene units.
ISSN:1420-3049

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