Acetalization of Ethylene-Vinyl Alcohol Copolymers in Homogeneous Solution

The acetalizations of ethylene-vinyl alcohol copolymers (EVOH) containing 32 and 45 mol% ethylene were studied kinetically in homogeneous solution. The rate constant was independent of the ethylene content and was almost proportional to the concentration of HCl, on the assumption that the acetalizat...

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Bibliographic Details
Published in:KOBUNSHI RONBUNSHU 1992/12/25, Vol.49(12), pp.993-998
Main Author: YONEZU, Kiyoshi
Format: Article
Language:eng ; jpn
Subjects:
1, 3-Butanediol
Acetalization
Ethylene-Vinyl Alcohol Copolymer
Formalization
Kinetics
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Summary:The acetalizations of ethylene-vinyl alcohol copolymers (EVOH) containing 32 and 45 mol% ethylene were studied kinetically in homogeneous solution. The rate constant was independent of the ethylene content and was almost proportional to the concentration of HCl, on the assumption that the acetalization occurs only between intramolecular neighboring vinyl alcohol units. The rate of the acetalization with acetaldehyde was about 700 times that of the formalization in a dimethyl sulfoxide-water-methyl alcohol mixture. 1, 3-Butanediol was acetalized with various aldehydes as a model compound of EVOH in dimethyl sulfoxide-water-methyl alcohol mixtures. The ratio of the rate of the acetalization with acetaldehyde to the rate of the formalization was similar to that of EVOH. The acetalization was retarded by a small amount of water, especially in case of the formalization.
ISSN:0386-2186
1881-5685
DOI:10.1295/koron.49.993