Preparation and Optical Properties of Silica-Poly(ethylene oxide) Hybrid Materials |
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Authors: | Oun-Ho Park Young-Joo Eo Yoon-Ki Choi Byeong-Soo Bae |
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Affiliation: | (1) Laboratory of Optical Materials and Coating (LOMC), Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), Taejon, 305-701, Korea |
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Abstract: | Structural evolution and optical properties of the silica-poly(ethylene oxide) hybrid films prepared from -glycidoxypropyltrimethoxysilane (GPTS) and 1-methylimidazol (MI) are studied. Polymerization of the epoxy groups is achieved by using 1-methylimidazol as a thermal curing agent. In liquid state 1H &13 C NMR spectroscopy, it is found that silica condensation mainly occurs without epoxy ring opening. The epoxide polymerization is confirmed by using FT-IR, solid state CP-MAS 13C-NMR, and differential scanning calorimetry (DSC). The hybrid material is densified due to the epoxide polymerization as well as silica condensation with thermal curing. As a result, the thermal curing increases refractive index and extinction coefficient and shifts UV optical absorption edge to longer wavelength. |
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Keywords: | sol-gel silica-poly(ethylene oxide) hybrid material epoxide polymerization optical properties |
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