Copolymerization kinetics of 4‐methoxystyrene with methyl methacrylate and 4‐methoxystyrene with styrene: A test of the penultimate model

Mark C. Piton, Mitchell A. Winnik, Thomas P. Davis, Kenneth F. O'driscoll

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Abstract

The propagation kinetics for the copolymerization of 4‐methoxystyrene with methyl methacrylate and 4‐methoxystyrene with styrene have been investigated using a pulsed laser technique. The dependence of the copolymerization propagation rate constant on the monomer feed ratio shows a diviation from classic Mayo–Lewis model kinetics for 4‐methoxystyrene with methyl methacrylate but not for 4‐methoxystyrene with styrene. These results have been interpreted to indicate that a penultimate effect is apparent in the first monomer pair but not in the second. With r1r2 = 0.092 for the copolymerization of 4‐methoxystyrene with methyl methacrylate and r1r2 = 0.95 for 4‐methoxystyrene with styrene, it is suggested that a deviation of the product of the coplymerization reactivity ratios from unity may be an indication of the presence of a penultimate effect.

Original languageEnglish
Pages (from-to)2097-2106
Number of pages10
JournalJournal of Polymer Science, Part A: Polymer Chemistry
Volume28
Issue number8
DOIs
Publication statusPublished - 1 Jan 1990
Externally publishedYes

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