Thermal decomposition of graphite fluoride. II. Kinetics of thermal decomposition of (CF)n in a vacuum.
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概要
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The rate of thermal decomposition of (CF)<I><SUB>n</SUB></I> prepared under several reaction conditions was measured in a vacuum. The rate was expressed by Avrami-Erofeyev's equation of second-order for highly oriented sample and of first-order for disordered one. The apparent activation energies of the decomposition reaction were about 50 kcal/mol (1 cal=4.184 J) for the former, and about 14 kcal/mol in higher temperature region and about 100 kcal/mol in lower temperature region for the latter. Thermal decomposition of (CF)<I><SUB>n</SUB></I> proceeds two-dimensionally around a nucleus of carbon which is formed at the initial stage of decomposition. The rate of thermal decomposition of various samples is dependent on the number of the nucleus forming sites. The nucleation of carbon takes place on a grain boundary between two small crystallites of (CF)<I><SUB>n</SUB></I>. The rate of the growth of the nucleus is fast along the grain boundary but slow in other directions. The activation energy was estimated to be about 100 kcal/mol for the former and almost 0 kcal/mol for the latter.
- 公益社団法人 日本化学会の論文
著者
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Koyama Satoshi
Department Of Cardiovascular Medicine Asahikawa Medical College
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Watanabe Nobuatsu
Department of Industrial Chemistry, Faculty of Engineering, Kyoto University
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