Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/41854
標題: Microstructural and morphological characteristics of PS-SiO2 nanocomposites
作者: Hsiue, G.H.
鄭如忠
Kuo, W.J.
Huang, Y.P.
Jeng, R.J.
關鍵字: nanocomposite
sol-gel materials
morphology
sol-gel process
organic-inorganic composites
nmr-spectroscopy
silica
si-29
methacrylate
dynamics
glasses
期刊/報告no:: Polymer, Volume 41, Issue 8, Page(s) 2813-2825.
摘要: A series of organic-inorganic hybrid materials have been prepared by copolymerizing styrene and alkoxysilane-methacrylate via the sol-gel process. The alkoxysilane-containing copolymer precursors were synthesized by free-radical copolymerization of styrene with an alkoxysilane-containing monomer, methacrylic acid 3-(trimethoxysilyl)propyl ester (MAMSE), at several feeds. The copolymer precursors were then hydrolyzed and condensed to generate PS-SiO2 hybrid sol-gel materials. The hybrid copolymers possess excellent optical transparency and a nanoscale microphase separation. The copolymer precursors and their hybrid copolymers were characterized by FT-IR spectra, H-1 NMR spectra, DSC, and TGA thermograms. Chemical structural effect on the morphology and thermal properties was investigated with SEM, mapping photographs, and high-resolution solid state C-13 and Si-29 NMR spectra. It was found that compatibility between copolymer and silica mainly comes from incorporating the polymer with silica covalently. Moreover, MAMSE could be hydrolyzed to methacrylic acid and ester-interchanged to silyl methacrylate during heat treatment. This also enhances the compatibility between the copolymer and silica, The thermal properties of the PS-SiO2 hybrid copolymers are improved as silica content increase. However, the presence of silyl ester groups, which were formed during heat treatment, would reduce the thermal stability of the hybrid copolymers. (C) 2000 Elsevier Science Ltd. All rights reserved.
URI: http://hdl.handle.net/11455/41854
ISSN: 0032-3861
文章連結: http://dx.doi.org/10.1016/s0032-3861(99)00478-4
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