| Summary: | 碩士 === 淡江大學 === 化學工程與材料工程學系碩士班 === 100 === In this study, spherical hollow silica nanoparticles, with diameter 50-60 nm and shell thickness ~10 nm, were successfully synthesized by the sol-gel method at room temperature, and surface-modified both by a coupling agent, 3-(trimethoxysilyl)propyl methacrylate (MSMA), and a capping agent, trimethyethoxysiliane (TMES). The particle sizes were determined by transmission electron microscopy (TEM) and dynamic light scattering (DLS), and the chemical structures of the formed particles were analyzed by means of Fourier transform infrared spectroscopy (FTIR) and solid state 29Si nuclear magnetic resonance (NMR). The prepared hollow silica particles were then UV-cured together with the acrylic monomers, dipentaethritol hexaacrylate (DPHA) and 2-hydroxyethyl methacrylate (HEMA), to prepare transparent nanocomposite thin films and thicker coatings on PMMA substrates by means of spin coating and doctor-blade coating, respectively. The prepared hybrid coatings with the surface-modified hollow silica particles up to 40 wt% attached perfectly to the PMMA substrate according to the peel test, and were highly transparent with transmittance >98 % and very hard with pencil hardness 7H–8H. Compared with the primal acrylic coating, the formed nanocomposite thin films showed lower refractive index and higher pencil hardness.
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