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- W4205656835 abstract "The objective of this work was to affect the in situ growth of silicon oxide microclusters or interpenetrating networks in Nation membranes via the sol-gel reaction for tetraethoxysilane (TEOS). The underlying hypotheses are: 1) The resultant morphology of the inorganic phase is ordered by the polymer's phase-separated morphology. 2) TEOS/ alcohol/H2O solutions will preferentially incorporate within pre-existing polar clusters. 3) TEOS hydrolysis in clusters is catalyzed by the fixed SO3H groups. Reproducible procedures for the in situ growth of silica in hydrated membranes contacting TEOS/alcohol solutions were established. Solids uptake vs. immersion time curves are a function of alcohol solvent type. Tensile properties vs. solids uptake indicate an initial strengthening, followed by a ductile-brittle transition suggesting a silicon oxide phase percolation threshold. FT-IR and 29Si solid state NMR analyses of microstructural evolution portray an inorganic network that is not as highly crosslinked as that of sol-gel-derived free silica and in fact becomes less coordinated and connected with increasing solids uptake." @default.
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- W4205656835 date "1989-07-21" @default.
- W4205656835 modified "2023-10-11" @default.
- W4205656835 title "Perfluorinated-Ionomer-Membrane-Based Microcomposites" @default.
- W4205656835 doi "https://doi.org/10.1021/bk-1989-0395.ch016" @default.
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