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A Fourier transform infra‐red spectroscopic study of wool subjected to permonosulphuric acid treatments
Author(s) -
Coderch L,
Pons R,
Erra P
Publication year - 1991
Publication title -
journal of the society of dyers and colourists
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.297
H-Index - 49
eISSN - 1478-4408
pISSN - 0037-9859
DOI - 10.1111/j.1478-4408.1991.tb01288.x
Subject(s) - wool , cystine , fourier transform infrared spectroscopy , chemistry , cysteine , shrinkage , reducing agent , nucleophile , oxidizing agent , nuclear chemistry , polymer chemistry , catalysis , organic chemistry , chemical engineering , materials science , composite material , engineering , enzyme
A study of the permonosulphuric acid wool shrinkproofing process has been carried. The aim was to determine the optimum conditions under which the oxidative and reductive steps should be performed, and effects of these steps on area shrinkage and degree of whiteness. The formation of external and internal cystine‐oxidised derivatives by FTIR was also examined. The presence of a certain amount of oxidising agent is necessary to partially oxidise the cystine, while the reducing/nucleophilic agent acts to form cysteine sulphonic acid, mainly at the fibre surface up to pH values of 8–8.5, and also at inside the fibre at higher pH values.