Copolymerization Propagation Kinetics of Styrene with Alkyl Methacrylates

Thomas P. Davis, Kenneth F. O’Driscoll, Mark C. Piton, Mitchell A. Winnik

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Copolymerizations have been carried out with styrene (STY) as monomer 1 and with ethyl (EMA), n-butyl (BMA), or lauryl (LMA) methacrylate as monomer 2. A pulsed UV laser was used to photoinitiate the polymerizations to low conversion. The resultant copolymers were analyzed for composition and molecular weight. Propagation rate constants were obtained as a function of composition for each of the copolymerizations, as well as reactivity ratios for the copolymerization of STY with EMA (r1 = 0.62, r2 = 0.35) and with BMA (r1 = 0.72, r2 = 0.45). None of the copolymerizations conformed to the Mayo-Lewis model with respect to their propagation rate constants. The results were interpreted using a penultimate model for propagation. Homopropagation rate constants for each of the monomers were also determined at several temperatures, allowing Arrhenius expressions to be formulated.

Original languageEnglish
Pages (from-to)2113-2119
Number of pages7
Issue number8
Publication statusPublished - 1 Jan 1990
Externally publishedYes

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