| dc.description.abstract | Thermo-curable nano-sized colloidal silica sol was synthesized and modified by coupling agents, methyl- trimethoxysilane (MTMS), and 3-(trimethoxysilyl)propyl methacrylate (MPTMS) in the presence of tetraethoxysilane (TEOS). These silica sols were prepared by keeping the molar ratio of silane monomers, solvent, water (H2O) (pH=1) constant at 1: 6: 4, respectively. On the other hand, PMMA modified solution was prepare by polymerization of methyl methacrylate (MMA) with methacrylic acid (MAA), MPTMS and perfluorohexylethyl acrylate (PFHEA). In order to improve the miscibility in silica sol and PMMA modified solution, isopropyl alcohol (IPA)/methyl ethyl ketone (MEK) (IPA：MEK=1：1) was chosen as the mixture solvent. The prepared polymer/silica films on PMMA substrates were characterized by UV-Vis spectroscopy, pencil hardness test, static water contact angle (WCA) and static diiodomethane contact angle (OCA) measurements. The effects of the composition of silane monomers, the ratio of silica sol to polymer modified solution, and the amount of MAA, MPTMS or PFHEA in polymer modified solution on the transparent, pencil hardness and hydrophobicity of prepared films were investigated. The results showed that with increasing the amount of MTMS and MPTMS in the sols, the hydrophobic and transparent properties were improved, respectively. On the other hands, with increasing MPTMS in the polymer solution, the transparent and hardness were improved. In addition, with increasing PFHEA in the polymer solution, the hydrophobic and oleophobic were improved.
The best result showed that relative light transmittance, pencil hardness, WCA and OCA of polymer/silica hybrid film on PMMA substrate were reached to 100.4%, 8H, 107。and 72.6。, respectively.
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