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New chain transfer agents for radical polymerization based on the addition-fragmentation mechanism

✍ Scribed by Shuiping Jiang; Heinz G. Viehe; Nicole Oger; Dominique Charmot

Publisher
John Wiley and Sons
Year
1995
Tongue
English
Weight
597 KB
Volume
196
Category
Article
ISSN
1022-1352

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✦ Synopsis

Abstract

This study describes 15 compounds with allylic or pentadienic structure carrying either captodative (cd) carbon‐ or heteroatom substituents as potential radical leaving groups in an addition‐fragmentation reaction. Their experimental evaluation as __c__hain‐__t__ransfer __a__gents (CTA) was achieved in radical polymerization of styrene and methyl methacrylate. The α‐(cd‐substituted methyl)acrylates 9 and 11 were more efficient than the t‐thioether 10 in lowering molecular weight of polystyrene. The dienes are particularly effective and provide macromonomers with terminal diene functions which are very useful for further copolymerization with a variety of vinyl monomers.

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