Journal
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
Volume 39, Issue 16, Pages 2777-2783Publisher
WILEY
DOI: 10.1002/pola.1256
Keywords
polystyrene stars; RAFT; living radical; termination
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Polystyrene stars were synthesized by reversible addition-fragmentation chain-transfer (RAFT) polymerization using hexakis(thiobenzoylthiomethyl)benzene (I) as a hexafunctional RAFT agent at 80, 100, and 120 degreesC. The polymerizations conformed to pseudo-first-order kinetic behavior. TI-ie molecular weight distributions displayed characteristics consistent with a living radical process. A number of salient features were observed in the molecular weight distributions with the star distribution accompanied by a linear polymer-chain distribution and shoulders on the distributions that can be attributed to radical-radical-termination events. The evidence suggests that high temperatures are required to activate all the RAFT active sites on I, and a hypothesis proposes that there is significant steric hindrance in the initial stages of the RAFT process with I. (C) 2001 John Wiley & Sons, Inc.
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