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KMID : 1041219990410020116
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Journal of Sericultural and Entomological Science
1999 Volume.41 No. 2 p.116 ~ p.121
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Oxime Generation of Silk Fibers by Hydroxylammonium choride Treatment
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Bae Do-Gyu
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Abstract
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This study was aimed to explain the essence of Hydroxylammonium hydrochloride(H.A.) effect on degummed silk fiber for increasing the colour acceptor sites due to oxime generating reaction. H.A. in agueous solution causes to increase the amount of [H+] and reduce pH values as the concentration of H.A. increases. The rate of [H+] adsorption of silk fiber in acidic solution differs on the basis of solution pH and shows a specific uptake in each pH, the lower the pH of solution, the higher the amount of [H+] adsorption. The pH of solution after treating of silk fiber in H.A. and HCI, showed more remaining [H+] in H.A. solution due to [H+] releasing under the procedure of oxime production. Also it was revealed that in higher concentration of H.A. the reaction for oxime fixation on silk fiber carried out stronger and as a result the bigger gap with acid uptake curve appeared. FT-IR analysis of silk fiber treated with H.A. revealed the crating of intermolecular H-bond at the 2,981-2,930 cm-1 , which was not appreaed for nontreated silk fibers and shows H-bond between N-OH group in one chain and C=0 group in another chain of silk protein. Colourimetry of dyed silk fiber after H.A. treatment showed that the silk fiber treated with the high concentration of R.A. compare to low concentration, absorbed more dyeing molecules and so showed less percentage of whiteness.
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