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- W2156575809 abstract "The microstructure of vinyl alcohol-vinyl acetate copolymers was studied using both 13C n.m.r. and 1H n.m.r. techniques. The sequence lengths of vinyl acetate units calculated respectively from the compositional dyads, from the methylene absorptions and feom the triple carbonyl absorptions in the 13C n.m.r. spectrum were not identical, and moreover the dyad-triad relationship showed a large discrepancy. 1H and 13C n.m.r. spectra of a 5 mol% re-acetylated random sample, containing mainly isolated acetate units, indicate that configurational splitting complicates the assignment of the triple carbonyl absorption, which originally was interpreted as a compositional triad. After correcting for tacticities the results could be brought in line and the C=O resonances proved to be useful in obtaining information on the percentage of isolated vinyl acetate units and the sequence length nA2+ (the average length of vinyl acetate units ≥2)." @default.
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- W2156575809 date "1983-05-01" @default.
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- W2156575809 title "Nuclear magnetic resonance studies on sequence distributions in vinyl alcohol-vinyl acetate copolymers" @default.
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- W2156575809 doi "https://doi.org/10.1016/0032-3861(83)90095-2" @default.
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