Kinetic study of methyltriethoxysilane (MTES) hydrolysis by FTIR spectroscopy under different temperatures and solvents

Jiang, Hongmei; Zheng, Zhen; Wang, Xinling

doi:10.1016/j.vibspec.2007.07.002

Cited by 74 publications

(54 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…FTIR spectroscopy has a high sensitivity with a fast scanning ability, however, this spectroscopy provided 'in situ" qualitative data [27]. Recently, it is worth noting that Jiang et al [38] obtained "in situ" quantitative analysis of methyltriethoxysilane (MTES) hydrolysis by calibrating the system with standards.…”

Section: Introductionmentioning

confidence: 99%

Tetraethylorthosilicate as molecular precursor to the formation of amorphous silica networks. A DFT-SCRF study of the base catalyzed hydrolysis

et al. 2012

View full text Add to dashboard Cite

Quantum chemical calculations using density functional theory have been carried out to investigate two chemical pathways for the last step of the hydrolysis of tetraethylorthosilicate (TEOS) in basic catalyzed environment. The two models that are introduced in this study depend on the number of water molecules involved at the base catalyzed hydrolysis. Solution equilibrium geometries of the molecules involved in the transition states, reactants and product complexes of the two chemical pathways were fully optimized at B3LYP level of theory with the standard 6-31+G(d) basis set, modeling solvent effects using a polarizable continuum solvation model (PCM). Both models predict relative low activation energies. However, the model with two water molecules seems to be more adequate to describe the basic hydrolysis. A natural bond orbital (NBO) analysis seems to show that the proton transfer from water to ethoxy group would occur through a large hyperconjugative interaction, LP(O) → σ*(O-H), which is related to the nonbonding oxygen lone pair orbital from ethoxy group with the vicinal σ*(O-H) anti bonding orbital O-H of a water molecule.

show abstract

Section: Introductionmentioning

confidence: 99%

Tetraethylorthosilicate as molecular precursor to the formation of amorphous silica networks. A DFT-SCRF study of the base catalyzed hydrolysis

et al. 2012

View full text Add to dashboard Cite

show abstract

“…Bands at 1267cm -1 and 1053 cm -1 are assigned to the -CN (symmetric bending) and -CO (asymmetric stretching) vibrations, respectively [33]. Intensities of those peaks confirm that there is a welldeveloped, cross-linked structure in the case of coatings deposited from aqueous solutions, which ZASTITA MATERIJALA 58 (2017) broj 4 552 contain uncondensed and hydrolyzed groups within the structure [34]. The results presented in the …”

Section: Afm Analysismentioning

confidence: 70%

Calotropis Procera plant extract as green corrosion inhibitor for 304 stainless steel in hydrochloric acid solution

Fouda¹,

El-Hossiany²,

Ramadan³

2017

Zas Mat

View full text Add to dashboard Cite

show abstract

“…En este sentido, se evidencia la disminución progresiva de la intensidad relativa de las bandas relacionadas con las vibraciones Si-O-C a 1170, 1110 y 1080 cm −1 , lo que se atribuye a la evolución de las reacciones de hidrólisis de los precursores. Así mismo, debido al avance de las reacciones de condensación se aparecen dos nuevas bandas a 1055 y 1135 cm −1 asociadas a las vibraciones de los enlaces Si-O-Si (Jiang et al, 2008;Criado et al, 2014).…”

Section: Caracterización De Los Soles Híbridosunclassified

Síntesis, caracterización y evaluación de la resistencia a la corrosión de recubrimientos híbridos Sol-Gel base TEOS/MPS sobre la aleación AA2050-T8

et al. 2017

View full text Add to dashboard Cite

RESUMEN:El presente trabajo tuvo como objetivo sintetizar, caracterizar y evaluar la resistencia a la corrosión de recubrimientos híbridos sol-gel base TEOS/MPS, sintetizados sobre la aleación AA2050-T8 (Al-Cu-Li) bajo diferentes condiciones experimentales de polimerización, tales como solvente y tiempo de envejecimiento, así como diferentes relaciones molares de los precursores inorgánico tetraetoxisilano (TEOS) e híbrido 3-metacriloxipropiltrimetoxisilano (MPS). Se monitoreó la evolución de los soles durante el proceso de envejecimiento mediante espectroscopía infrarroja (FT-IR) y ensayos reológicos. Los recubrimientos se obtuvieron mediante dip-coating y fueron caracterizados a través de microscopía electrónica de barrido (MEB-EDX). La evaluación de la resistencia a la corrosión se realizó mediante ensayos de polarización anódica potenciodinámica, en solución aireada 0,1 M de NaCl. Los resultados obtenidos revelaron que, de los tres solventes evaluados, el etanol es el que permite mejor estabilización del precursor híbrido y favorece el proceso de polimerización de los grupos metacrilato del precursor MPS. Por otra parte, la variación de la relación molar TEOS:MPS conlleva a la obtención de recubrimientos más homogéneos y continuos al incrementar la relación del precursor inorgánico. Finalmente, todos los recubrimientos sintetizados mejoraron la resistencia a la corrosión de la aleación AA2050-T8, en especial los sintetizados bajo la relación TEOS:MPS 80:20. ABSTRACT: Synthesis, characterisation and corrosion resistance of TEOS/MPS hybrid sol-gel coatings deposited on the AA2050-T8 alloy. The aim of the present work was to synthesize, characterise and evaluate the corrosion resistance of TEOS/MPS hybrid sol-gel coatings applied on the AA2050-T8 aluminium alloy attending to two experimental variables: the sol synthesis conditions (type of solvent and aging time), and the inorganic/hybrid (TEOS/MPS) ratio. The aging process was monitored by infrared spectroscopy (FTIR) and viscosity measurements. The hybrid coatings were obtained by dip-coating and then characterized by scanning electron microscopy (SEM-EDX). The evaluation of corrosion resistance was performed by anodic potentio dynamic polarization testing in aerated 0.1 M NaCl solution. The results showed that ethanol as solvent promoted better stabilization of the hybrid precursor and favoured polymerization of the

show abstract

Kinetic study of methyltriethoxysilane (MTES) hydrolysis by FTIR spectroscopy under different temperatures and solvents

Cited by 74 publications

References 29 publications

Tetraethylorthosilicate as molecular precursor to the formation of amorphous silica networks. A DFT-SCRF study of the base catalyzed hydrolysis

Tetraethylorthosilicate as molecular precursor to the formation of amorphous silica networks. A DFT-SCRF study of the base catalyzed hydrolysis

Calotropis Procera plant extract as green corrosion inhibitor for 304 stainless steel in hydrochloric acid solution

Síntesis, caracterización y evaluación de la resistencia a la corrosión de recubrimientos híbridos Sol-Gel base TEOS/MPS sobre la aleación AA2050-T8

Contact Info

Product

Resources

About