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題名 | Preparation of Highly Transparent 13F-Modified Nano-Silica/Polymer Hydrophobic Hard Coatings on Plastic Substrates= |
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作者 | Chang, Chao-ching; Lin, Zi-min; Huang, Shu-hui; Cheng, Liao-ping; |
期刊 | Journal of Applied Science and Engineering |
出版日期 | 20151200 |
卷期 | 18:4 2015.12[民104.12] |
頁次 | 頁387-394 |
分類號 | 440.34 |
語文 | eng |
關鍵詞 | Colloidal silica; Hard coating; UV-curing; Plastic substrate; Hydrophobic; |
英文摘要 | Silica nanoparticles synthesized from tetraethoxysiliane (TEOS) via a sol_gel process were surface-modified by using 3-(trimethoxysilyl)propyl methacrylate (MSMA) and 1H, 1H, 2H, 2Hperfluorooctyltriethoxysilane (13F). MSMA acted as a coupling agent and a C=C provider, whereas 13F was employed to enhance hydrophobicity. The surface-modified silica particles together with a multi-functional monomer were UV-cured to yield highly transparent thin films (~7 _m) on plastic substrates. Both FE-SEM imaging and UV_visible spectroscopy confirmed uniform dispersion of nano-silica in the hybrid thin films. The coating surfaces were extremely smooth, with average roughness over the range 1.0_2.3 nm based on profilometric measurements. X-ray photoelectron spectroscopy indicated that surface-modified silica particles have migrated to the top surface to reduce the surface energy. Therefore, only a small dosage of 1 mol% (vs. TEOS) was enough to engender surface hydrophobicity with water contact angle of 100_. Furthermore, all of the prepared coatings were hard with pencil hardness reached 6H, and they adhered strongly to the poly(methyl methacrylate) substrate according to the peel test. |
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