| Summary: | 碩士 === 國立高雄師範大學 === 化學系 === 104 === The main object of this research is to synthesize the novel BEA/SR-494/MSMA/Al2O3 nanocomposite materials with thermal resistant by sol-gel reaction processes. Firstly, the MSMA coupling agent was performed the silanol intermediates by hydrolysis in PH1~2 acid solution. These silanol intermediates could be successfully coupled with colloid Al2O3 and crosslinked to organic matrixes. The remained active acrylate monomer of the MSMA/ Al2O3 complexes could be covalently coupled bonding with SR-494 acrylate monomer. Finally, in order to improve the thermal resistance and mechanical properties, the BEA acrylate monomer and the SR-494/MSMA/Al2O3 complexes were covalently bonded by free radical polymerization to achieve perfectly cross-linking structure of organic/inorganic nanocomposite.
The bonding formation and the best weight content of reaction components were identified by FT-IR spectra. The thermal resistance properties, surface resistances, transmittance, and hardness of these nanocomposites were measured by TGA, super megohmeter, UV-vis and hardness tester respectively. Experimental results showed that the best Td values was 454.41℃ which was 31.63℃ and 148.04℃ higher than those of pure BEA and SR-494 acrylate resin respectively. The glass transition temperature is not detected below 200℃. The surface resistances of BEA/SR-494/MSMA/Al2O3 hybrid thin films were decreased from 4.85×1013Ω/cm2 to 2.88×109Ω/cm2. These composites maintain at least 80% in the visible region and light penetration hardness up 8H. The morphology structure of the hybrid thin films was estimated by SEM. The results showed that the optical thin films were evenly distributed with inorganic colloidal particles and the average particle size of these nanocomposites was 30~60 nm.
|
|---|
