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Formation of Free Radicals in Polyamide Fibers during Drawing
Author(s) -
Matthies P.,
Schlag J.,
Schwartz E.
Publication year - 1965
Publication title -
angewandte chemie international edition in english
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 0570-0833
DOI - 10.1002/anie.196503321
Subject(s) - radical , absorption (acoustics) , polyamide , photochemistry , materials science , chemistry , red shift , polymer chemistry , composite material , organic chemistry , physics , quantum mechanics , galaxy
The formation of free radicals during the process of drawing of spun fibers was observed for the first time with two polyoxamides. The fibers turn red, and an ESR signal can be detected. Both, color and ESR absorption are not permanent. The decrease in the intensity of the ESR absorption and the change in the optical reflectance with time, as well as the dependence of the decoloration on temperature were investigated. The action of high‐energy radiation on the polyoxamides also leads to a red coloration and gives rise to ESR signals. It is concluded that the red color is due to free radicals associated with the oxamido group.