| Summary: | 碩士 === 國立高雄師範大學 === 化學系 === 104 === This research is to synthesis di-TMTPA/SR-444/VTMS/Al2O3 organic/inorganic nano-composites with high heat resistance, transparent and abrasion resistance by sol-gel methods.Firstly, the VTMS was performed the silanol intermediates by hydrolysis in pH2~3 acid solution to prove inorganic nanofiller Al2O3 organic modified.The modified Al2O3 could couple with VTMS to increase the level of network covalent with organic matrixes.The remained active Si-OH or Al-OH functional groups of the SR-444 organic acrylate monomer to synthesis SR-444/VTMS/Al2O3 complexes.Finally, the SR-444/VTMS/Al2O3 and the novel di-TMPTA acrylate copolymer monomer were chain polymerized by UV-activated polymerization to form ideally covalent network structure to improve the heat resistance and mechanical properties.
The chemical bonding formation and the best weight contents of reaction components were identified by FT-IR spectra.The thermal resistance, optical transmittance, abrasion resistance, and hardness test of these nanocomposites were measured by TGA, UV-Vis, super megohmmeter, and pencil hardness tester respectively.Experimental results showed that these nanocomposites had 90~95% transmittance in visible regions and the best Td value was 470.01℃.The surface resistance of di-TMPTA/SR-444/VTMS/Al2O3 was 1.83×109Ω/cm2 and the best weight content of synthesis components was 0.80/0.60/0.20/0.06 which the overall percentage of inorganic filler Al2O3 weight was 3.61wt%.The beat hardness of this nanocomposites was 9H.These result showed that the optical films were evenly distributed which meaned the Al2O3 nanofiller and the VTMS coupling agent were excellent bondings and dispersion in organic matrixes and the average particle size of these nanocomposites was 50~65nm.It was important that the inorganic starting materials were micrometer scale of Al2O3 inorganic filler.
|
|---|
