Abstract
AbstractPolymerization of vinyl acetate initiated by 2,2′‐azobis(isobutyronitrile) at 75°C in the presence of iodine has been investigated. The process efficiently controls the number‐average molecular weight and low polydispersities (Mw/Mn ≤ 1.52). Poly(vinyl acetate) with predetermined molecular weight and relatively low polydispersity was successfully synthesized. The polymerization was followed by online 1H‐NMR spectra to investigate the evolution of several compounds in the reaction medium, especially the adduct of α‐iodoisobutyronitrile ((CH3)2(CN)CI) between primary radicals and iodine. The structure of the end groups of poly(vinyl acetate) also was investigated using 1H‐NMR spectra. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012
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