Preparation of acrylic resin-hollow silica nanoparticles hydrophobic composite coatings on plastic substrates

• Main Authors: Wei-Ting Tsai, 蔡偉婷
• Other Authors: Chao-Ching Chang
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/3b7vpx

碩士 === 淡江大學 === 化學工程與材料工程學系碩士班 === 102 === In this study, ~90 nm spherical hollow silica nanoparticles were synthesized by the sol-gel method at room temperature. The synthesized hollow nanoparticles were surface-modified using the coupling agent and a fluorosilane in order to provide C=C bonds and hydrophobicity, respectively. The morphology and size/zeta potential of the formed nanoparticles were observed and measured by transmission electron microscopy and dynamic light scattering, respectively. Transparent composite coatings composed of the nanoparticles and acrylic monomer were prepared on the poly(methyl methacrylate) substrate via spin coating followed by UV-curing. Compared with the primal acrylic coating, the composite coatings showed higher water contact angles and lower refractive indices, while remained good visible transparency and pencil hardness. The contact angles of the coatings were increased but the refractive indices were decreased with increasing the silica content in the coating and fluorosilane content on the particle surface. However, the transmittances were decreased with these two. In the extreme case, a composite coating containing 40 wt% hollow silica nanoparticles with pencil hardness of 4H, a contact angle of 117o, and a refractive index of 1.35 was obtained.