Abstract
Free radical polymerizations of α-methylstyrene (AMS) were performed in dispersions of oil in water using a mixture of nonionic nonylphenoxy poly(ethylene glycol) surfactants and initiated with ascorbic acid/hydrogen peroxide at temperatures ranging from 3 to 45 °C. A bimodal distribution of high (∼60,000 g/mol) and low molecular weight components (∼8000 g/mol) was analyzed by size-exclusion chromatography (SEC). The relative amount of the low molecular weight fraction increased with increasing the polymerization temperature. The polymer yields decreased from 52% at 3 °C to 3% at 45 °C. The syndiotactic content of PAMS decreased from 70% rr at 3 °C to 58% rr at 45 °C. © 2001 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 39: 525–529, 2001
Published Version
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