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Received March 9, 2001
Accepted May 26, 2001
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Modification of Polycarbosilane as a Precursor with High Ceramic Yield for Oxygen-Free SiC Fibers
Key Lab. of C.F.C, National University of Defense Technology, Changsha, 410073, China 1Department of Fine Chemical Engineering and Chemistry, Chungnam National University, Daejeon 305-764, China
dpkim@cuvic.chungnam.ac.kr
Korean Journal of Chemical Engineering, September 2001, 18(5), 761-764(4), 10.1007/BF02706397
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Abstract
Polycarbosilane (PCS) was modified by addition of 1 wt% polyborazine and subsequent heat treatment at 70-400 ℃. The modified PCS exhibited highly improved ceramic yield from original 63% to 78% by heating at 70 ℃ for 10 h. The molecular weight of the PCS modified at higher temperatures markedly increased, then was rendered infusible but soluble PCS in organic solvent on heating at 300 ℃. (1)H-NMR indicated that original PCS was enhanced by dehydrocoupling reaction between Si-H groups. Solution of the modified PCS was hand-drawn to fibers, followed by direct pyrolysis up to 1,400 ℃ without air-curing step to convert into oxygen-free SiC fibers. The morphology and crystalline phase were determined by SEM and XRD analysis, respectively.
References
Birot M, Pillot JP, Dunogues J, Chem. Rev., 95(5), 1443 (1995)
Choi GJ, Toreki W, Batich CD, J. Mater. Sci., 35(10), 2421 (2000)
Chu ZY, Song YC, Xu YS, Fu YB, J. Mater. Sci. Lett., 18(21), 1793 (1999)
Fan XL, Feng CX, Song YC, Li XD, J. Mater. Sci. Lett., 18(8), 629 (1999)
Funayama O, Aoki T, Kato T, Okoda M, Isoda T, J. Mater. Sci., 31(23), 6369 (1996)
Kang PH, Yang HS, Korean J. Chem. Eng., 15(6), 580 (1998)
Kho JG, Min DS, Kim DP, J. Mater. Sci. Lett., 19(4), 303 (2000)
Moon KT, Min DS, Kim DP, J. Ind. Eng. Chem., 3(4), 288 (1997)
Pysher DJ, Goretta KC, Hodder RS, Tressler RE, J. Am. Ceram. Soc., 72(2), 284 (1989)
Soraru GD, Babonneau F, Mackenzie JD, J. Mater. Sci., 25, 3886 (1990)
Choi GJ, Toreki W, Batich CD, J. Mater. Sci., 35(10), 2421 (2000)
Chu ZY, Song YC, Xu YS, Fu YB, J. Mater. Sci. Lett., 18(21), 1793 (1999)
Fan XL, Feng CX, Song YC, Li XD, J. Mater. Sci. Lett., 18(8), 629 (1999)
Funayama O, Aoki T, Kato T, Okoda M, Isoda T, J. Mater. Sci., 31(23), 6369 (1996)
Kang PH, Yang HS, Korean J. Chem. Eng., 15(6), 580 (1998)
Kho JG, Min DS, Kim DP, J. Mater. Sci. Lett., 19(4), 303 (2000)
Moon KT, Min DS, Kim DP, J. Ind. Eng. Chem., 3(4), 288 (1997)
Pysher DJ, Goretta KC, Hodder RS, Tressler RE, J. Am. Ceram. Soc., 72(2), 284 (1989)
Soraru GD, Babonneau F, Mackenzie JD, J. Mater. Sci., 25, 3886 (1990)
