本研究使用溶膠-凝膠法在室溫下合成中空奈米二氧化矽粒子，粒徑平均55 nm、殼厚10 nm，並在表面經過偶合劑3-(trimethoxysilyl)propyl methacrylate (MSMA)和封頭劑trimethyethoxysiliane (TMES)加以改質，二氧化矽溶膠粒子粒徑將藉由DLS、TEM，二氧化矽奈米球化學結構以FTIR、NMR和EA來檢測。所製備的二氧化矽奈米球結合壓克力單體dipentaethritol hexaacrylate (DPHA)和2-hydroxyethyl methacrylate (2-HEMA)利用紫外光交聯技術分別以旋轉塗佈和刮刀法在PMMA基板上製備透明混成塗膜。所製備的混成塗膜二氧化矽比例添加40%以下，可見光穿透率>98%，具備良好的性和附著度，厚膜的鉛筆硬度達到7~8 H，比壓克力單體硬度高。實驗結果證明所製備奈米混成塗膜具有較低折射率和較高的鉛筆硬度，在工業上有實用性。 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.