Hydrogen abstraction reaction of hydrogenated diamond surface in liquid phase by radical initiators used in polymer synthesis

Various radical initiators were used for investigating the hydrogen abstrac tion reaction on hydrogenated diamond surface. Benzophenone excited by UV l ight, which is one of the most popular photosensitizers, could not abstract the hydrogen atoms. Thermally excited alpha,alpha'-azobisisobutyronitrile (AIBN), which is one of the most popular radical initiators of azo compound s, could also not abstract the hydrogen atoms. On the other hand, benzoyl p eroxide, which is one of the most popular radical initiators of peroxide co mpounds, could abstract the hydrogen atoms. The reaction rate of the hydrog en abstraction reaction by benzoyl peroxide depended on the species of solv ent. The hydrogen atoms in CH2 group on (100) face are more reactive than t hat in CH3 group on (111) face.