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Preparation of N ‐methoxymethylated nylon‐3 and application of its membrane to pervaporation of water/alcohol mixture
Author(s) -
Suzuki Fumio,
Kimura Hiroshi,
Onozato Kenji,
Kuroda Syuko
Publication year - 1986
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1986.070320422
Subject(s) - pervaporation , membrane , polymer , polymer chemistry , permeation , chemistry , alcohol , methanol , chemical engineering , materials science , nuclear chemistry , organic chemistry , biochemistry , engineering
Nylon‐3 prepared by hydrogen transfer polymerization of acrylic amide was N ‐methoxymethylated by paraformaldehyde/methanol in its formic acid solution. This product was soluble in water, and we were able to obtain a transparent membrane by casting of the solution. Absorbance of the NH group on IR spectrum was decreased by methoxymethylation, and from this depression of absorbance a degree of N ‐methoxymethylation of about 33% was obtained which agreed with the value from elemental analysis. DSC curve of this polymer showed a endothermic peak at 80°C which was assumed to be the T g and a exothermic peak starting at 180°C which was assumed to be the crosslinking reaction. The degree of crystalinity of this polymer was about 40% which was obtained by deuterium exchange reaction with deuterium oxide. By heating of this polymer membrane up to 190°C, it was changed to an insoluble polymer by the crosslinkage reaction between methoxymethyle and unreacted amide groups. This insoluble polymer membrane was used for the separation of water/alcohol mixture by the pervaporation technique. Through the membrane, water was permeated selectively compared with alcohol and the selective permeation was found to increase by raising the heat treatment temperature.