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Poly(vinyl alcohols) derived from the product of polymerization of vinyl acetate in methanol have been characterized by various physical and chemical methods before and after NaIO 4 cleavage. The 220‐MHz 1 H‐NMR spectra confirm the reliability of NaIO 4 titrimetry for estimating 1,2‐glycol content and help explain the tendency for viscometry to grossly underestimate the 1,2‐glycol content for low molecular weight polymers. The spectra and related chemical evidence indicate that the major endgroups are HOCH 2 CH 2 and CH 3 CH(OH)CH(OH)CH 2 . ß‐Hydroxyethyl groups also occur as short chain branches, mainly attached to α carbon atoms in the normal head‐to‐tail polymer chain sequence. The concentrations of the branch and endgroups depend on polymerization conditions and help explain polymerization “solvent” effects on physical properties.
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Adelman et al. (1975) studied this question.
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