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Reactivity differences between isolated and vicinal vinyl acetate functions in high pressure ethylene/vinyl acetate copolymers

✍ Scribed by R.J. Koopmans; R. Dommisse; F. Alderweireldt; R. Van der Linden; E.F. Vansant

Book ID: 103076098
Publisher: Elsevier Science
Year: 1983
Tongue: English
Weight: 296 KB
Volume: 19
Category: Article
ISSN: 0014-3057
DOI: 10.1016/0014-3057(83)90032-0

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✦ Synopsis

Three ethylene/vinyl acetate copolymers (3.5, 12.0 and 18.8 mo13o VA: average melt index 8.5 g/10 min) were transformed into ethylene/vinyl alcohol copolymers and ethylene/vinyl alcohol/vinyl acetate terpolymers by homogeneous saponification. The reaction rate increased with mol0,] VA. This feature originated in the reactivity differences beteen vicinal and isolated VA functions. Simultaneous steric and polarity effects caused the reaction rate differences. ~H-NMR, i.r., dielectric measurements and additional saponification reactions confirmed the difference of reactivity.

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