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Determination of transfer constants of non-ionic thiolended surfactants (transurfs) in styrene free-radical polymerizations

✍ Scribed by Frédéric Vidal; Robert G. Gilbert

Publisher: John Wiley and Sons
Year: 1996
Tongue: English
Weight: 260 KB
Volume: 197
Category: Article
ISSN: 1022-1352
DOI: 10.1002/macp.1996.021970605

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✦ Synopsis

Abstract

The transfer constants of 1‐dodecanethiol and non‐ionic thiol‐ended surfactants (transurfs) have been determined for the bulk polymerization of styrene at 70°C; these values are 19 for l‐dodecanethiol and 19 and 14 for the transurfs with 17 and 90 ethylene oxide units, respectively. Transfer constants are obtained from the high‐molecular‐weight portion of the full number molecular weight distribution.

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## Abstract Using the Mayo and the Clay‐Gilbert method, the transfer rate coefficient of α‐thioglycerol (TG) was determined at 50°C for the polymerization of methyl methacrylate (MMA) in a 3 mol · L^−1^ tetrahydrofuran solution using different amounts of 2,2′‐azoisobutyronitrile (AIBN) as initiator