Sequential ROMP of cyclooctenes as a route to linear polyethylene block copolymers

Louis M. Pitet, Jihua Zhang, Marc A. Hillmyer

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

AB diblock copolymers were prepared by sequential ring-opening metathesis polymerization of cyclooctenes catalyzed by a Ru-based Grubbs catalyst. The relatively slow polymerization of cis-3-phenylcyclooct-1-ene (3PC) or cis-cyclooct-2-en-1-yl acetate (3AC) was first carried out and then followed by the faster polymerization of unsubstituted cis-cyclooctene (COE) from the active Ru-alkylidene chain ends. In contrast, simultaneous polymerization of the two monomers provides copolymers with a statistical monomer distribution owing to extensive chain transfer. The resulting poly(3PC-b-COE) and poly(3AC-b-COE) diblock copolymers were subjected to hydrogenation to selectively saturate the backbone alkenes. The consequences of architectural variance between the materials from simultaneous vs. sequential polymerizations are reflected by the contrasting thermal characteristics.

Original languageEnglish (US)
Pages (from-to)9079-9088
Number of pages10
JournalDalton Transactions
Volume42
Issue number25
DOIs
StatePublished - Jul 7 2013

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