Hydrolysis–condensation reactions of diethylphosphato-ethyltriethoxysilane with tetraethoxysilane studied by 29Si-NMR: Solvent and phosphonate catalytic effect

Nieuwenhuyse, P. Van; Bounor‐Legaré, Véronique; Boisson, Fernande; Cassagnau, Philippe; Michel, Alain

doi:10.1016/j.jnoncrysol.2007.10.020

Cited by 23 publications

(10 citation statements)

References 35 publications

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“…The spectrum presents two main resonances at −50 and −60 ppm and a weak resonance at −42 ppm. According to the literature,53–55 the first two signals are assigned to T 1 and T 2 species, respectively, whereas the third signal corresponds to T 03 species (see Table 5 for assignments). Although it is not possible from this spectrum to quantitatively determine the fraction of each species, the area of the T 1 and T 2 signals is higher than that of the T 03 signal indicating the predominance of condensed species over fully hydrolyzed APTES moieties.…”

Section: Resultsmentioning

confidence: 99%

Micellar behavior of well‐defined polystyrene‐based block copolymers with triethoxysilyl reactive groups and their hydrolysis–condensation

Gamys

Beyou

Bourgeat‐Lami

2010

J. Polym. Sci. A Polym. Chem.

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Block copolymers of acryloxy propyl triethoxysilane and styrene were prepared through nitroxide‐mediated polymerization using alkoxyamine initiators based on N‐tert‐butyl‐1‐diethylphosphono‐2,2‐dimethylpropyl nitroxide. The copolymers were characterized by 1H NMR, size exclusion chromatography and differential scanning calorimetry. Their micellar behavior in dioxane/methanol solutions was examined through static light scattering and transmission electron microscopy (TEM). TEM indicated the successful formation of spherical micelles which were subsequently frozen by the sol–gel process. Hydrolysis–condensation of the reactive ethoxysilyl side groups was followed by FTIR, 1H NMR, and 29Si NMR. © 2010 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 48: 784–793, 2010

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Section: Resultsmentioning

confidence: 99%

Micellar behavior of well‐defined polystyrene‐based block copolymers with triethoxysilyl reactive groups and their hydrolysis–condensation

Gamys

Beyou

Bourgeat‐Lami

2010

J. Polym. Sci. A Polym. Chem.

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“…Few years ago, a new approach was developed as an alternative to this path of dispersion [20][21][22] and lately for improving the flame retardancy of thermoplastic polymers such as PA6 [23].…”

Section: A C C E P T E D Accepted Manuscriptmentioning

confidence: 99%

Influence of organophosphorous silica precursor on the thermal and fire behaviour of a PA66/PA6 copolymer

Sahyoun

Bounor‐Legaré

Ferry

et al. 2015

Polymer Degradation and Stability

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International audienceAn organophosphorus silica filler was generated in situ the molten PA66 copolymer (Cop-PA) during extrusion process without adding solvents. Nanocomposites synthesis is based on hydrolysis-condensation reactions of diethylphosphatoethyltriethoxysilane precursor (SiP). The thermal stability of Cop-PA/ SiP nanocomposites and the major degradation products were studied by thermogravimetric analysis (TGA) and TGA coupled with Infrared spectrometry (TGA/FTIR). The Pyrolysis Combustion Flow Calorimeter (PCFC) and cone calorimeter were used to investigate the fire behaviour of the nanocomposites. Results showed a decrease by more than 50% of the peak of heat release rate (PHRR) and the formation of an expanded char layer with the addition of only 0.91wt% of silicon and 0.96wt% of phosphorus by this original route of fillers dispersion

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“…Copolisilsesquioxano fosfonado com composição de 50:50 (mol:mol) foi sintetizado a partir de dietilfosfatoetiltrietoxisilano (Ph-TEOS) e feniltrietoxisilano (PTES) através de procedimento descrito por Nieuwenhuyse et al [24] Os reagentes na razão molar determinada, foram dissolvidos em 30 mL de etanol absoluto e, sob agitação, foi adicionado 1 mL de HCl (1 mol.L -1 ) como catalisador. A mistura foi mantida sob agitação por 24 horas.…”

Section: Síntese Do Copolisilsesquioxano Fosfonado -Cfunclassified

Produção de membranas híbridas zirconizadas de SPEEK/Copolissilsesquioxano para aplicação em células a combustível do tipo PEM

et al. 2012

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Membranas baseadas em poli(aril éter cetona) sulfonada mostraram ser bastante promissoras para aplicação em células a combustível com membrana trocadora de prótons (PEMFC). O poli(éter-éter-cetona) sulfonado (SPEEK), com elevado grau de sulfonação (GS), apresenta alta condutividade de prótons, mas sofre perda de funcionalidade e condutividade em temperaturas altas e umidades baixas. O desenvolvimento de membranas híbridas é uma das possibilidades para melhorar o desempenho destes materiais. Neste trabalho foram preparadas membranas híbridas zirconizadas de SPEEK/copolissilsesquioxano fosfonado (CF) por casting, a partir de SPEEK com GS entre 60% e 70% e soluções de cloreto de zirconila (ZrOCl2) 1, 5, ou 10% (m/m). As membranas foram caracterizadas por espectroscopia na região do infravermelho (FTIR), difratometria de raios-X (DRX), análise termogravimétrica (TG), calorimetria exploratória diferencial (DSC), condutividade de prótons (σ) e microscopia eletrônica de varredura (MEV). A análise por energia dispersiva (EDS) confirmou a presença de Zr em domínios esféricos dispersos homogeneamente pelas membranas, enquanto análises de DRX mostraram que os produtos da zirconização são amorfos. Ensaios de impedância eletroquímica indicam aumento da condutividade protônica com a adição de CF e 1 ou 5% de ZrOCl2.

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Hydrolysis–condensation reactions of diethylphosphato-ethyltriethoxysilane with tetraethoxysilane studied by 29Si-NMR: Solvent and phosphonate catalytic effect

Cited by 23 publications

References 35 publications

Micellar behavior of well‐defined polystyrene‐based block copolymers with triethoxysilyl reactive groups and their hydrolysis–condensation

Micellar behavior of well‐defined polystyrene‐based block copolymers with triethoxysilyl reactive groups and their hydrolysis–condensation

Influence of organophosphorous silica precursor on the thermal and fire behaviour of a PA66/PA6 copolymer

Produção de membranas híbridas zirconizadas de SPEEK/Copolissilsesquioxano para aplicação em células a combustível do tipo PEM

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