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Direct fiber formation and fiber properties of aromatic polyoxadiazoles
Author(s) -
Imai Yoshio
Publication year - 1970
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1970.070140121
Subject(s) - sulfuric acid , tenacity (mineralogy) , spinning , fiber , materials science , aqueous solution , elongation , terephthalic acid , thermal stability , composite material , isophthalic acid , chemical engineering , fineness , synthetic fiber , polymer chemistry , chemistry , organic chemistry , ultimate tensile strength , polyester , engineering , metallurgy
A novel and simple fiber formation process has been developed to fabricate aromatic polyoxadiazoles. The aromatic copolyoxadiazole solution prepared from terephthalic acid, isophthalic acid, and hydrazine sulfate in fuming sulfuric acid was utilized directly as spinning solution and was successfully wet‐spun to form fiber into a coagulating bath containing sulfuric acid. In the wet‐spinning process, selection of the coagulating bath was the most important factor, and the best results were obtained by the use of approximately 50 wt‐% aqueous sulfuric acid. It was easy to prepare a polyoxadiazole fiber having a tenacity of more than 4 g/den. and an elongation of more than 10%. In addition, the fiber properties reached to a tenacity of 6 g/den. and an elongation of 12% under optimum spinning conditions. The wet‐spun polyoxadiazole fiber showed an almost round cross section and a clear skin‐core structure by microscopic observation. The fiber had a high level of thermal and dimensional stability and a high proportion of property retention at elevated temperatures, as well as all‐round general fiber properties.