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

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 1-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.