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Steam and heat setting of nylon 6 fiber. III. Changes in viscosity and amino and carboxyl endgroups by heat setting
Author(s) -
Tsuruta M.,
Koshimo A.,
Tagawa T.
Publication year - 1965
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.1965.070090104
Subject(s) - hydrolysis , viscosity , nylon 6 , fiber , heat sensitive , materials science , amino acid , polymer chemistry , polymer , molecule , chemistry , composite material , organic chemistry , biochemistry , layer (electronics)
The relative viscosity and amino and carboxyl endgroup contents for unset, dry‐heat‐set, and steam‐set nylon 6 fiber were determined. The results for the heat‐set fibers are almost the same as those for the unset fibers. Therefore, it is difficult to explain the increase of dye uptake in steam setting on the basis of hydrolysis of nylon molecules. The differences in amino endgroup contents as determined by the p ‐toluenesulfonic acid and 2,4‐dinitrofluorobenzene methods indicate that 20–30% of the amino groups might be occluded in the crystalline regions after steam setting.