含氟聚(矽氧烷-醯胺-亞醯胺)-矽石混成材料之研究
碩士 === 國防大學中正理工學院 === 應用化學研究所 === 89 === Hydrogen-bond acidic fluorinated poly(siloxane-amide-imide)-silica hybrid materials (FPASI-SiO2) were obtained using the sol-gel technique by polycondensation of tetramethoxysilane(TMOS) in diethoxysilane terminated amic acid solution. IR, 29Si- and 13C-NMR s...
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| Format: | Others |
| Language: | zh-TW |
| Published: |
2001
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| Online Access: | http://ndltd.ncl.edu.tw/handle/00495197901343671396 |
| Summary: | 碩士 === 國防大學中正理工學院 === 應用化學研究所 === 89 === Hydrogen-bond acidic fluorinated poly(siloxane-amide-imide)-silica hybrid materials (FPASI-SiO2) were obtained using the sol-gel technique by polycondensation of tetramethoxysilane(TMOS) in diethoxysilane terminated amic acid solution. IR, 29Si- and 13C-NMR spectroscopy and thermogravimetric analysis (TGA) were used to study hybrids containing various proportions of TMOS. The abundant Q4 structures implied that in the absence HCl the degree of condensation of TMOS was enhanced by hydrogen-bond acidic fluorinated poly(siloxane-amide-imide). The microstructure and chain mobility of the hybrids were investigated by spin-lattice relaxation time in rotating frame (TH1r) and the time constant for the energy exchange between 1H and 29Si spin systems (TSiH) measurements. The results suggested that the rate of polarization transfer in FPSAI-SiO2 hybrids was dependent on the local motion. On the other hand, the spin-diffusion path length (L) in FPSAI-SiO2 hybrids were clearly around 3.6 nm. The apparent activation energy (Ea) for degradation of the hybrids was studied by van Krevelen method. The Ea values of the FPSAI-SiO2 hybrids in thermal degradation decreased with increasing silica content, whereas those in thermooxidative degradation almost unchange.
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