Authors: I-J. Kim, K.H. Kwon
Affilation: Cheil Industries Inc., Korea
Pages: 759 - 762
Keywords: organic-inorganic, hybrid, nanocomposites, silica, nanoparticles
Novel organic-inorganic hybrid nanocomposites were synthesized through emulsion grafting polymerization in the presence of silica particles coated with methacryloxy(propyl)trimethoxysilane. Well-defined polymer chains were grown from the nanoparticle surfaces to yield individual particles composed of a silica core and a well-defined, densely grafted outer poly(styrene-co-acrylonitrile) or poly(methyl methacrylate) layer. Core-shell or other interesting morphology composite particles were obtained depending on the grafting density of the polymer chains and the silica seed diameter. The morphology and properties of the nanocomposites were characterized by using transmission electron microscopy (TEM), scanning electron microscopy (SEM), differential scanning calorimetry (DSC), tensile tests, impact strength tests, and thermogravimetry. The resulting nanocomposites demonstrated increased tensile strength, glass-transition temperature (Tg), scratch resistance and thermal stability, and showed good silica dispersion regardless of the particle sizes. It is because of the existence of the covalent bond between the polymer chains and the silica nanoparticles that increased the compatibility between the organic and the inorganic phases.