Hydrogen Abstraction Reaction of Hydrogenated Diamond Surface in Liquid Phase by Radical Initiators Used in Polymer Synthesis

Toshiki TSUBOTA*, Osamu HIRABAYASHI†, Shintaro IDA†, Shoji NAGAOKA, Masanori NAGATA, Yasumichi MATSUMOTO†, Katsuki KUSAKABE†† and Shigeharu MOROOKA††

Material Development Department, Kumamoto Industrial Research Institute; 3-11-38 Higashimachi, Kumamoto-shi 862-0901 Japan
† Department of Applied Chemistry and Biochemistry, Faculty of Engineering, Kumamoto University; 2-39-1 Kurokami, Kumamoto-shi 860-8555 Japan
†† Department of Applied Chemistry, Kyushu University; 6-10-1 Hakozaki, Fukuoka-shi 812-8581 Japan

Various radical initiators were used for investigating the hydrogen abstraction reaction on hydrogenated diamond surface. Benzophenone excited by UV light, which is one of the most popular photosensitizers, could not abstract the hydrogen atoms. Thermally excited α,α'-azobisisobutyronitrile (AIBN), which is one of the most popular radical initiators of azo compounds, could also not abstract the hydrogen atoms. On the other hand, benzoyl peroxide, which is one of the most popular radical initiators of peroxide compounds, could abstract the hydrogen atoms. The reaction rate of the hydrogen abstraction reaction by benzoyl peroxide depended on the species of solvent. The hydrogen atoms in CH2 group on (100) face are more reactive than that in CH3 group on (111) face.
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