DYEING PROPERTY OF ACID DYES FOR SILK FIBROIN PRETREATED WITH VERY DILUTE HYDROCHLORIC ACID

Autor:	Izumi Fumoto
Rok vydání:	1986
Předmět:	Materials science biology fungi Fibroin Hydrochloric acid General Medicine Antheraea pernyi biology.organism_classification Crystallinity chemistry.chemical_compound SILK Isoelectric point chemistry Bombyx mori Polymer chemistry Dyeing
Zdroj:	Sen'i Gakkaishi. 42:T534-T537
ISSN:	1884-2259 0037-9875
DOI:	10.2115/fiber.42.9_t534
Popis:	Silk fibroin (Antheraea pernyi and Bombyx mori) were treated with very dilute hydrochloric acid (0.001N-0.01N). After the treatment, crystallinity determined by means of X-ray diffraction as well as the amount of amorphous region estimated based on the specific gravity was increased, but the weight decrease was not observed. The absolute values of zeta-potential of the treated silk fibroins had a tendency to become larger than those of the untreated fibroins, and the isoelectric points of the fibers shifted to the alkaline side after the treatment.From the facts described above, it may be suggested that the semicrystalline region of the treated silk fibroin is partially transformed to amorphous or crystalline portion, because of the absorption of hydrochloric acid and the unravelling of the entanglement of the fiber molecules due to the ionization of side chains of molecules by the attached hydrogen ions.The exhaustion of acid dyes by the treated silk fibroin in the finite dye bath is more promoted than by the untreated fibroin. This might be attributed to the readily cationized amino groups. These structural and dyeability effects resulting from the treatment are more significant for Antheraea pernyi fibroin in comparison with Bombyx mori fibroin.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::f3ac9b58937c4108d2b4af00ba79f736 https://doi.org/10.2115/fiber.42.9_t534 Zobrazit plný text záznamu