Chemistry of Silane Coupling Agents

Plueddemann, Edwin P.

doi:10.1007/978-1-4899-0342-6_2

Cited by 115 publications

(178 citation statements)

References 14 publications

(3 reference statements)

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“…Molecular monolayers 1 can form on these substrates and alter their physiochemical properties. Silane coated surfaces have a variety of applications, such as: hydrophobic 2 and frictionless coatings 3,4 , adhesives between polymers and ceramics 5,6 , or immobilizing 7 biological molecules on surfaces.…”

Section: Introductionmentioning

confidence: 99%

Reactive Molecular Dynamics Simulations of the Silanization of Silica Substrates by Methoxysilanes and Hydroxysilanes

2016

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Abstract:We perform reactive molecular dynamics simulations of monolayer formation by silanes on hydroxylated silica substrates. Solutions composed of alkylmethoxysilanes or alkylhydroxysilanes in hexane are placed in contact with a hydroxylated silica surface and simulated using a reactive force field (ReaxFF). In particular, we have modeled the deposition of butyl-, octyl-, and dodecyltrimethoxysilane to observe the dependence of alkylsilyl chain length on monolayer formation. We additionally modeled silanization using dodecyltrihydroxysilane, which allows for the comparison of two grafting mechanisms of alkoxysilanes: (1) direct condensation of alkoxysilane with surface bound silanols, and (2) a two-step hydrolysiscondensation mechanism. In order to emulate an infinite reservoir of reactive solution far away from the substrate, we have developed a method in which new precursor molecules are periodically added to a region of the simulation box located away from the surface. It is determined that the contact angle of alkyl tails bound to the surface is dependent on their grafting density. During the early stages of grafting alkoxy-and hydroxysilanes to the substrate, a preference is shown for silanes to condense with silanols further from the substrate surface, and also nearby to neighboring surface-bound silanols. The kinetics of silica silanization by hydroxysilanes were observed to be much faster than methoxysilanes. However, the as-deposited hydroxysilane monolayers show similar morphological characteristics as those formed by methoxysilanes.

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Section: Introductionmentioning

confidence: 99%

Reactive Molecular Dynamics Simulations of the Silanization of Silica Substrates by Methoxysilanes and Hydroxysilanes

2016

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“…1 Organofunctional silanes are hybrid organic-inorganic compounds that can be used as coupling agents across organic-inorganic interface. 2 They may be used as adhesion promoters between organic polymers and mineral substrates under a variety of circumstances. The silane adhesion promoters, or "coupling agents", may function as (i) a finish or surface modifier, (ii) a primer or (iii) an adhesive, depending on the thickness of the bonding material at the interface.…”

Section: Introductionmentioning

confidence: 99%

“…A surface modifier or "finish" may theoretically be only a monomolecular layer, but in practice, may be several layers thick. 2 Silane coatings are "passive" organic coatings, since they act essentially as a physical barrier that hinders the penetration of aggressive species towards the metallic substrate. However, this behaviour can be Vol.…”

Section: Introductionmentioning

confidence: 99%

“…4, 2008 modified by the inclusion of small amounts of chemicals with corrosion inhibiting properties. 1,2 Various organo functional silanes are available in the market today. Applied on different metallic substrates (as zinc, 3,4 steel, [5][6][7] aluminum, 3,8,9 magnesium alloy 10 ), they have been widely studied from both formation and performance points of view.…”

Section: Introductionmentioning

confidence: 99%

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Electrochemical behavior of carbon steel pre-treated with an organo functional bis-silane filled with copper phthalocyanine

Suegama

Aoki

2008

J. Braz. Chem. Soc.

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Neste trabalho, depositou-se sobre aço carbono o filme de bis-[trimetoxisililpropil]amina (BTSPA) adicionado de ftalocianina de cobre (Cu-Ph). Na obtenção desse filme variou-se as concentrações de Cu-Ph e a temperatura de cura (120 e 150 °C) e nas amostras curadas à 150°C, adicionou-se uma segunda camada. O comportamento eletroquímico do aço carbono recoberto com o filme aditivado com Cu-Ph foi estudado por técnicas eletroquímicas (medidas de espectroscopia de impedância eletroquímica e curvas de polarização) em solução aerada de NaCl 0,1 mol L -1 . A caracterização física e química foi feita por análise termogravimétrica (TGA), microscopia eletrônica de varredura, medidas de ângulo de contato e espectroscopia de infravermelho. A TGA não mostrou decomposição da Cu-Ph durante o processo de cura e a quantidade de Cu-Ph adicionada ao filme polissilânico apresentou forte influência na resistência à corrosão, principalmente quando a amostra é curada a 150 °C. Os resultados mostraram que menores concentrações de inibidor forneceram maior resistência à corrosão e a segunda camada aumentou em uma ordem de grandeza a resistência à corrosão.The bis-[trimethoxysilylpropyl]amine (BTSPA) film filled with copper phthalocyanine (Cu-Ph) was prepared by adding different concentrations of copper phthalocyanine -Cu-Ph and deposited on a carbon steel substrate using 120 ºC and 150 ºC as curing temperatures. For samples cured at 150 ºC a second layer was also deposited. The electrochemical behavior of carbon steel coated with BTSPA filled with Cu-Ph was studied by electrochemical measurements, electrochemical impedance spectroscopy (EIS) and polarization curves, in aerated 0.1 mol L -1 NaCl solution. Physical and chemical characterization was made by thermogravimetric analysis (TGA), scanning electron microscopy, contact angle measurements and infrared spectroscopy. TGA showed no decomposition of Cu-Ph during the curing process. Cu-Ph added into the silane film showed a strong influence on its corrosion resistance, mainly when the samples are cured at 150 ºC. The results showed that lower inhibitor concentrations led to a higher corrosion resistance and the second layer increased by one order of magnitude the corrosion resistance.

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“…The structure of this polyorganosiloxproperties of the composite. To have some idea about the ane coating is not exactly known [1][2][3][4][5], although there adhesion mechanism between the silane coupling agents and the polymeric matrices, as proposed by Plueddeman [8], it is necessary to know how the polymer matrix One method used in the determination of local propthe figures, is presented in Table I. erties in polymer systems is the measurement of some portion of the optical response of a molecule that is sensiLabeling Procedure tive to a particular property of the local medium [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

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González‐Benito

Aznar

Lima³

et al. 2000

Journal of Fluorescence

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E-glass fibers were silanized using a 1% (v/v) aqueous solution of ␥-aminopropyltriethoxysilane (APES). Pyrenesulfonamide conjugates were formed by reaction of 1-pyrenesulfonyl chloride (PSC) in acetonitrile (AcN), with the amine groups immobilized on the glass fiber surface. These pyrene-sulfonamide conjugates were used as fluorescence probes, being a relatively simple analytical method to study the coating microstructure of polyorganosiloxane layer on glass fibers. The first aim of this work was to estimate possible interactions of the polyaminosiloxane coating with surrounding molecules of different solvents (solvent accessibility to the chromophore). For this study, the fluorescence response of pyrene-sulfonamide dye (PSA) was correlated with solvent polarity parameters. It was concluded that all the studied solvents were accessible to the chromophore, and they can gather in two groups, depending on their ability to swell the poliorganosiloxane layer. The second objective was to estimate the rigidity of the coating polymer from the temperature dependence of PSA emission. At about 180 K, a sudden change in the behavior of different photophysical parameters of PSA were observed. This phenomenon was interpreted as a density change in the polyaminosiloxane attached to the glass fibers.

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Chemistry of Silane Coupling Agents

Cited by 115 publications

References 14 publications

Reactive Molecular Dynamics Simulations of the Silanization of Silica Substrates by Methoxysilanes and Hydroxysilanes

Reactive Molecular Dynamics Simulations of the Silanization of Silica Substrates by Methoxysilanes and Hydroxysilanes

Electrochemical behavior of carbon steel pre-treated with an organo functional bis-silane filled with copper phthalocyanine

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