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HWAHAK KONGHAK,
Vol.28, No.6, 669-675, 1990
Vol.28, No.6, 669-675, 1990
질산증기에 의한 석유계 등방성핏치섬유의 안정화
Stabilization of the Isotropic Pitch Fibers Drived from Petroleum with Nitric Acid Vapor
탄소섬유 제조시 안정화공정의 온도를 낮추고, 시간을 단축하고자 질산증기를 산화제로, 질소를 운반기체로 사용하여 석유계 등방성핏치섬유를 산화하였으며, 그 결과를 공기산화에 의한 결과와 비교하였다. 질산증기 산화결과, 85℃에서 20분 이내에 핏치섬유의 안정화가 완전히 이루어져 1000℃에서 탄화할 때 섬유형상이 그대로 유지되었다. 산화섬유내에는 카보닐기와 니트로기가 새로 생성되었다. 한편, 산화가 안된 섬유의 중앙 부근은 탄화하는 동안 등방성조직이 이방성조직으로 전환되었다.
Nitric acid vapor was used to oxidize the isotropic pitch fibers for reduction of stabilization tempera-ture and time, and the results were compared to those of hot air oxidation method. The pitch fibers were completely stabilized by nitric acid vapor within 20minutes at 85℃. Carbonyl and nitro groups were observed in the stabilized fiber. This fully stabilized fiber was sustained its shape during the carbonization at 1000℃. On the other hand, the isotropic structure of the fiber core insufficiently stabilized was converted to an optical anisotropic structure during car-bonization.
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