Effects of Solvent and Degree of Polymerization on the Rate of Intermolecular Formalization of Ethylene-Vinyl Alcohol Copolymer

Intermolecular formalization of ethylene-vinyl alcohol copolymers (EVOH) was studied kinetically till the gel point in dimethyl sulfoxide-water mixtures on the basis of Charlesby's theory related to gelation of polymer. At an EVOH concentration ([OH]) below 0.6 mol/l, the rate was nearly propor...

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Bibliographic Details
Published in:KOBUNSHI RONBUNSHU 1995/11/25, Vol.52(11), pp.698-702
Main Author: YONEZU, Kiyoshi
Format: Article
Language:Japanese
Subjects:
Charlesby's Theory
Ethylene-Vinyl Alcohol Copolymer
Excluded Volume Effect
Formalization
Gel Point
Intermolecular Formalization
Kinetics
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Summary:Intermolecular formalization of ethylene-vinyl alcohol copolymers (EVOH) was studied kinetically till the gel point in dimethyl sulfoxide-water mixtures on the basis of Charlesby's theory related to gelation of polymer. At an EVOH concentration ([OH]) below 0.6 mol/l, the rate was nearly proportional to [OH] and the number of polymer molecules, and was fast in a poor solvent. But above 0.6 mol/l of [OH] the rate was fast in a good solvent and increased with increasing degree of polymerization. These results showed that the rate-determining step was the collision process between a hemiformal group of one polymer molecule and a hydroxyl group of another molecule, and the rate was affected by the excluded volume effect and accelerated with the formation of polymer entanglement.
ISSN:0386-2186
1881-5685
DOI:10.1295/koron.52.698