Pg. Odell et al., CHARACTERISTICS OF THE STABLE FREE-RADICAL POLYMERIZATION OF STYRENE IN THE PRESENCE OF 2-FLUORO-1-METHYLPYRIDINIUM P-TOLUENESULFONATE, Macromolecules, 30(8), 1997, pp. 2232-2237
The behavior of the stable free radical moderated polymerization of st
yrene in the presence of 2-fluoro-1-methylpyridinium p-toluenesulfonat
e (FMPTS) has been examined. The rate enhancement has been found to be
the result of the decrease of free nitroxide (TEMPO) concentration th
at shifts the equilibrium between capped and growing chains toward the
growing free radical form. The decrease in TEMPO concentration was sh
own to be coupled to the presence of FMPTS. The system is sensitive to
the initiator employed and the timing of the addition of FMPTS. If th
e polymerization rate change due to the change in TEMPO concentration
is accounted for, a secondary polymerization retarding influence of FM
PTS was observed.