![]() ![]() Various methods have been developed to prepare the core–shell particles ( 1, 15, 18, 19, 20, 21, 22). Other potential applications for core–shell particles are electronics ( 7, 8, 9, 10), pharmaceutical materials ( 11, 12), optics ( 13), and catalysis ( 14, 15, 16, 17). Such composite particles can be used as fillers for nanocomposites, where the filler reinforces the matrix resin because of its excellent compatibility with the matrix ( 2, 3, 4, 5, 6). Numerous studies have attempted to manufacture core–shell particles with a polymeric shell and an inorganic core ( 1). ![]() Hybrid nanoparticles composed of inorganic and organic materials have been attracting immense attention and can contribute to the development of various composite materials. This result suggests strong interactions at the core–shell interface. The glass transition temperatures of the obtained polymer shells were higher than those of the corresponding bulk materials. It should also be noted that the present method produced a considerable amount of pure polymer besides the core–shell particles. It was found that the cross-linking monomer 1,4-divinylbenzene tends to promote shell formation, and the cross-linking reaction may stabilize the core–shell structure throughout radical polymerization. The obtained shell morphology strongly depended on the monomers, which suggests different shell formation mechanisms with respect to the monomers. MMA formed thin homogeneous shells of polymer (PMMA) less than 100 nm in thickness with complete surface coverage and a very smooth shell surface. The core–shell structure was successfully achieved without adding a surfactant via simple free-radical polymerization (soap-free emulsion polymerization) for various monomers of styrene, methyl methacrylate (MMA), and their derivatives. In this study, core–shell particles were prepared as a hybrid material, in which a thin polymer shell was formed on the surface of the SiO 2 sphere particles. ![]()
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