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Alkali resistance of a casein‐acrylonitrile graft copolymer fiber
Author(s) -
Tang RenCheng,
Mei Jie
Publication year - 2008
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.28744
Subject(s) - acrylonitrile , alkali metal , sodium hydroxide , fiber , casein , copolymer , sodium bicarbonate , hydrolysis , polymer chemistry , materials science , sodium carbonate , chemistry , sodium , nuclear chemistry , polymer , composite material , organic chemistry
The casein‐acrylonitrile graft copolymer fiber was treated in sodium hydroxide, sodium carbonate, and sodium bicarbonate solutions to evaluate its alkali resistance which was very important for wet processing. The weight loss and whiteness of the treated fibers were examined. UV spectra of the alkaline treatment solutions and IR spectra of the treated fibers were analyzed. The study showed that the fiber exhibited poor alkali resistance. Treating temperature, alkali concentration, and strength affected the weight loss and whiteness of the treated fibers. A high weight loss was found even at low alkali concentration, and the obvious yellowing was observed at higher alkali concentration and temperature. The weight loss was primarily due to the hydrolysis of casein, whereas the yellowing was caused by the hydrolysis of nitrile groups and induced formation of CN conjugated system. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008