WET-SPINNING OF THE POLY(GLUTAMIC ACID) (PGA) FIBERS USING THE PHOSPHORIC ACID AS A COAGULANT

Autor:	Seigo Oya, Juzo Takahashi
Rok vydání:	1982
Předmět:	chemistry.chemical_compound Materials science Aqueous solution chemistry Chemical engineering Polymer chemistry Coagulation (water treatment) Molecule General Medicine Glutamic acid Fiber Spinning Phosphoric acid
Zdroj:	Sen'i Gakkaishi. 38:T338-T341
ISSN:	1884-2259 0037-9875
DOI:	10.2115/fiber.38.8_t338
Popis:	A conc. aqueous solution of poly (sodium-L-glutamate) (PSLG) was spun in an aqueous phosphoric acid solution as a coagulant. The coagulation parameters, such as the concentration, temperature and length of the coagulation bath, were discussed in relation to the chain conformation, crystal-type and mechanical properties of the resulting fibers.The fibers in good quality were obtained by the spinning under the optimum conditions; the concentration ranging from 30 to 50%, temperature 20 to 30°C and length of the coagulation bath 0.25m to lm. The molecular chains of fibers were found to be extended and formed β-type crystals. These crystals were highly oriented along the fiber axis. The conformation of PGA molecules changed from the α-helix to the β-structure at temperatures above 70°C. Therefore, it is preferable to be carried out the wet-spinning at temperatures below 70°C.
Databáze:	OpenAIRE
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