Populations of oligomers in sol-gel condensation

Brunet, F.; Cabane, Bernard

doi:10.1016/0022-3093(93)91298-h

Cited by 57 publications

(50 citation statements)

References 25 publications

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“…The reactivity of the silicon species generally decreased as their degree of condensation increased, as had already been observed by other researchers [16,17]. …”

Section: Resultssupporting

confidence: 82%

Improvement in Char Strength with an Open Cage Silsesquioxane Flame Retardant

et al. 2017

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Different characterization techniques were used to study the hydrolysis and condensation reaction kinetics of 3-methacryloxypropyltrimethoxysilane (MAPTMS) to obtain open cage silsesquioxane oligomers. The formation of hydrogen bonds, which condition the chemical structures of the resulting products, was identified. Improved thermal and fire resistant behavior of unsaturated polyester (UP) composites prepared with aluminium trihydroxide (ATH) and the synthesized oligomer were registered. Opened silsesquioxane structures also showed an improvement in the mechanical properties of the char formed after firing.

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“…The reactivity of the silicon species generally decreased as their degree of condensation increased, as had already been observed by other researchers [16,17]. …”

Section: Resultssupporting

confidence: 82%

Improvement in Char Strength with an Open Cage Silsesquioxane Flame Retardant

et al. 2017

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“…[37,38] The 29 Si signals of the smaller [RSi(OR′)O] n cyclic products (n ≤ 4 and R′ = Pr, Me, or H) show a lower-field shift relative to the linear T 2 because the cyclization reduces the valence angles, thereby decreasing the density of positive charge on the Si atoms. [37,38] The 29 Si signals of the smaller [RSi(OR′)O] n cyclic products (n ≤ 4 and R′ = Pr, Me, or H) show a lower-field shift relative to the linear T 2 because the cyclization reduces the valence angles, thereby decreasing the density of positive charge on the Si atoms.…”

Section: Resultsmentioning

confidence: 99%

Mechanism and Kinetics of Oligosilsesquioxane Growth in the In Situ Water Production Sol–Gel Route: Dependence on Water Availability

et al. 2016

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Thiol-functionalized nanobuilding blocks (NBBs) were synthesized from 3-mercaptopropyltrimethoxysilane by using the in situ water production (ISWP) process in which the water needed to hydrolyze the precursor was provided by means of an esterification reaction. In the present study the reaction between 1-propanol and chloroacetic acid was used. Whereas the growth of the Si oligomers was followed at room temperature and 100°C using 1D 29 Si and 2D 1 H-29 Si heteronuclear single quantum correlation (HSQC) NMR spectroscopic experiments, the amount of water delivered along the process was followed by means of 1 H NMR spectroscopy. The results show a good correlation between the evolution of the degree [a]

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“…For the synthesis of ceramic filler (SiO 2 ), tetraethyl orthosilicate (TEOS, Aldrich) was used as precursor material, ethanol as solvent and Ammonia solution as a catalyst. To obtain nano fillers, TEOS was hydrolyzed through the two-step hydrolysis process [19]. The pH of the solution was kept at ∼10 (i.e.…”

Section: Methodsmentioning

confidence: 99%

Structural, thermal and ion transport studies on nanocomposite polymer electrolyte-{(PEO + SiO2):NH4SCN} system

Pandey

Dwivedi

Tripathi

et al. 2008

Ionics

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Development and characterisation of polyethylene oxide (PEO)-based nanocomposite polymer electrolytes comprising of (PEO-SiO 2 ): NH 4 SCN is reported. For synthesis of the said electrolyte, polyethylene oxide has been taken as polymer host and NH 4 SCN as an ionic charge supplier. Sol-gel-derived silica powder of nano dimension has been used as ceramic filler for development of nanocomposite electrolytes. The maximum conductivity of electrolyte ∼2.0 × 10 −6 S/cm is observed for samples containing 30 wt.% silica. The temperature dependence of conductivity seems to follow an Arrhenius-type, thermally activated process over a limited temperature range.

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Populations of oligomers in sol-gel condensation

Cited by 57 publications

References 25 publications

Improvement in Char Strength with an Open Cage Silsesquioxane Flame Retardant

Improvement in Char Strength with an Open Cage Silsesquioxane Flame Retardant

Mechanism and Kinetics of Oligosilsesquioxane Growth in the In Situ Water Production Sol–Gel Route: Dependence on Water Availability

Structural, thermal and ion transport studies on nanocomposite polymer electrolyte-{(PEO + SiO2):NH4SCN} system

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