Journal of Industrial and Engineering Chemistry, Vol.7, No.3, 147-152, May, 2001
Contribution of Hydrogen Bond and Coupling Reaction to Improvement in Compatibility of Organic Polymer/Silica Nanocomposites
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Various organic polymer/silica hybrid composites were prepared by a sol-gel reaction for mixtures of tetraethyl orthosilicate (TEOS) and an organic polymer. In this study, various kinds of organic polymers were prepared in order to confirm that both intermolecular interaction and chemical bonding between organic and inorganic materials play a major role in the compatibility of hybrid composites. In the case of hybrid composites prepared with organic polymers containing carbonyl groups in their side chains, an improved compatibility was accomplished due to the intermolecular hydrogen bonds between the carbonyl groups in the side chains and the silanol groups of the silica, more of which were formed relative to the carbonyl group content. Meanwhile the hybrid composites prepared by the reaction of TEOS and coupling organic copolymers including a trimethoxysilyl group showed an enhanced improvement in compatibility. Accordingly, it would appear that the coupling bonds formed by the trimethoxysilyl groups capable of a sol-gel reaction with silica were mainly responsible for the compatibility of the hybrid composites.
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