| Summary: | 碩士 === 國立高雄師範大學 === 化學系 === 107 === The main object of this research is to develop SR-444/VTMS/ZnO organic/inorganic nanocomposites with good heat resistance, good transparence in visible, UV-shielding, anti-static, high hardness and adhesion properties by sol-gel reaction.
During this research, SR-444 worked as organic acrylate monomer, VTMS as silane coupling agent, ZnO as inorganic filler. Firstly, the coupling agent VTMS formed its reactive silanol intermediate by acid hydrolysis for 30 min in pH=2.0 3.0 g HCl(l). After into the acidic solution of ZnO. we get the VTMS/ZnO complexes by active Si-OH groups of these silanols and Zn-OH bonding covalently in order to modify zinc oxide surface. The remained active Si-OH functional groups of the VTMS/ZnO complexes could be covalently coupled bonding with SR-444 acrylate monomer. Finally, by UV-activated free radical polymerization to obtain a cross-linking structure of SR-444/VTMS/ZnO nanocomposite after mixing and stir dispersion. During every step, the best time and weight content of reaction components were identified through FT-IR spectra.
The thermal resistance properties by TGA, the visible transmittance and UV-shielding by UV-Vis, anti-electrostatic properties, hardness by pencil hardness tester and adhesions by adhesion tester. The experimental results showed that the best Td value of these composites is 453.78 °C which was 36.92 °C higher than pure SR-444 acrylate resin. The best transmittance was 88 % in visible region and UV-shielding properties. The surface resistances content conformed to anti-electrostatic range (106~ 1012 Ω/cm2). The hardness was 9H by hardness test and adhesion was 4B by cross-cut test. Finally, the results showed inorganic colloidal particles distributed evenly in material and average particle size less than 100 nm conformed to the nanocomposites structure by SEM.
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