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- W4255996951 abstract "We report on the results of 29Si NMR monitoring of alkoxysilane/ethanol/acid water sol-gels with tetraethoxysilane (TEOS), methyltriethoxysilane (MTEOS) and vinyltriethoxysilane (VTEOS). The gel time of the TEOS solution was 49 days at the degree of condensation c = 0.81, whereas MTEOS and VTEOS do not gel in spite of the high c = 0.95 achieved. The polymerization kinetics progressively slows with the time owing to the growth of sterical restrictions. To account for the effect we developed a kinetic model based on the reaction rates which explicitly decay as a function of the degree of condensation. The model describes the complete sol-gel process in all the studied systems including a gel transition in TEOS and aging of the gel." @default.
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- W4255996951 date "1996-01-01" @default.
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- W4255996951 title "Sol-gel polymerization in alkoxysilanes: 29Si NMR study and simulation of chemical kinetics" @default.
- W4255996951 doi "https://doi.org/10.1016/b978-0-444-82413-4.50107-4" @default.
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