NDLI: Connection of polymer chains using diepoxide in CO<sub>2</sub>/propylene oxide copolymerizations

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Back cover

Polymer Chemistry Vol - 2 Issue - 3

Polymer Chemistry Vol - 2 Issue - 2

Polymer Chemistry Vol -1

Connection of polymer chains using diepoxide in CO₂/propylene oxide copolymerizations

Content Provider	Royal Society of Chemistry (RSC)
Author	Lee, Sang Hwan Lee, Bun Yeoul Cyriac, Anish
Copyright Year	2011
Abstract	When a small amount of vinylcyclohexene dioxide ([diepoxide]/[cat] = 60, 0.14 w% propylene oxide) is additionally added in CO2/propylene oxide copolymerization catalyzed by a highly active catalyst, cobalt(III) complex of a Salen-type ligand tethered by four quaternary ammonium salts (2), some polymer chains are connected consequently resulting in an increased molecular weight of up to Mw = 606000 and broadened molecular weight distribution. The same chain-connecting process is also applicable in the presence of chain transfer agent, tricarballylic acid (C3H5(CO2H)3), 1,2,3,4-butanetetracarboxylic acid (C4H6(CO2H)4), or adipic acid (C4H8(CO2H)2), although a higher amount of diepoxide is needed. Gel permeation chromatography reveals multi-modal distributions along with a tail at a high molecular weight portion due to formation of the connected chains. The shape of the chain transfer agent varies the chain topology, but the rheological properties are not influenced by the topology change. The poly(propylene carbonate)-block-poly(ethylene glycol) copolymer, which is obtained by feeding poly(ethylene glycol)-OH as a chain transfer agent, becomes tough in the tensile properties and shows a high shear sensitivity in the rheological properties when some chains are connected using diepoxide.
Starting Page	950
Ending Page	956
Page Count	7
File Format	HTM / HTML PDF
ISSN	17599954
Volume Number	2
Issue Number	4
Journal	Polymer Chemistry
DOI	10.1039/c0py00365d
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Ethylene glycol Ammonium Ligand Rheology Polymer Cobalt Gel permeation chromatography Propylene oxide Chain transfer Propene Network topology Carboxylic acid Cat Molar mass distribution Copolymer
Content Type	Text
Resource Type	Article
Subject	Organic Chemistry Biochemistry Bioengineering Biomedical Engineering Polymers and Plastics

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