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Characterization of styrene–methyl methacrylate– n ‐butyl acrylate terpolymers. I. Average diad concentration determined by 1 H‐NMR
Author(s) -
Kobayashi Minoru
Publication year - 1988
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1988.070350202
Subject(s) - diad , copolymer , styrene , methyl methacrylate , polymer chemistry , monomer , reactivity (psychology) , materials science , methyl acrylate , proton , polymerization , triad (sociology) , polymer , physics , medicine , alternative medicine , pathology , quantum mechanics , composite material , psychology , psychoanalysis
The average diad concentrations of methyl methacrylate (MMA) unit, P 2 { M i M j }, of the title terpolymer prepared by radical polymerization with various conversions were studied by 1 H‐NMR measurements. Several methoxy proton peaks of MMA resolved by the diamagnetic shielding effects of styrene were assigned to the individual microstructures of MMA‐centered triads. The P 2 { M i M j } were determined from these peak ratios according to the terminal copolymerization model and the Ham's assumption of statistical simplification for a multicomponent copolymer ( P 2 { M i M j } = P 2 { M j M i }), The observed values, P 2 { M i M j }, agreed with the values calculated from the monomer reactivity ratios for each conversions, and agreement with the copolymerization theory was evident.

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