Adsorption of γ -UPS silane onto E-glass fibers from aqueous solutions

Kaunisto, Marika; Watson, Hazel; Rosenholm, Jarl B.

doi:10.1163/15685610252771167

Cited by 3 publications

(6 citation statements)

References 24 publications

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“…The surface chemistry of siliceous supports is mainly controlled by surface silanol groups, the distribution, concentration, and state of which depend on the chemical composition of the support, − on its chemical , and heat − treatment, and on storage conditions prior to silanization . The formation of silane overlay is affected by the type of catalyst, − by the temperature, and in particular by the moisture content, ,− by the type and concentration of amino(alkoxy)silane, , and by pH. ,, …”

Section: Introductionmentioning

confidence: 99%

Surface-Deposited Acid/Base on Glass Microfibers in Formation of (3-Aminopropyl)triethoxysilane-[2-(3,4-epoxycyclohexyl)ethyl]heptaisobutyl- octasilsesquioxane Bioverlay

et al. 2006

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Silanization of macroporous glass microfiber filters with (3-aminopropyl)triethoxysilane (APTES) and subsequent binding of [2-(3,4-epoxycyclohexyl)ethyl]heptaisobutyloctasilsesquioxane (E-POSS) to the amine-terminated surface of microfibers was studied. Prior to the silanization, minute quantities of concentrated aqueous solutions of hydrochloric acid or ammonia were adsorbed in the filters while attachment of E-POSS molecules to APTES overlay was not specially catalyzed. Analysis of DRIFT, XPS, and 13C CP/MAS NMR spectra has shown that the formation of APTES overlay is affected differently by the surface-deposited acid or base. It was proved by XPS that microfibers with the adsorbed acid take up higher amounts of covalently attached APTES by 42% and, subsequently, of E-POSS by 65% than microfibers with the adsorbed ammonia. The molecular mechanics model calculations, which were made using silica as a template, have shown that approximately two-layered APTES coating can be built on the model surface if complete hydrolysis of ethoxy groups and vertical condensation of APTES species are assumed.

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Section: Introductionmentioning

confidence: 99%

Surface-Deposited Acid/Base on Glass Microfibers in Formation of (3-Aminopropyl)triethoxysilane-[2-(3,4-epoxycyclohexyl)ethyl]heptaisobutyl- octasilsesquioxane Bioverlay

et al. 2006

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“…The acrylate-, epoxy-, and ureidosilane-treate d bres, however, had an IEP with an acidic pH, consistent with a non-ionic or an Si O Si surface. The outermost surfaces of ureidosilane-treate d E-glass bres consisted of cross-linked silanol groups, which would be less likely to react with a matrix polymer [3,4,7]. This surface appeared to be the same over the pH range measured (pH 4-10, inclusive) and also when deposited from several organic solvents [3 -8].…”

Section: Deposition and Deposition Orientation Of The Silane Solutionsmentioning

confidence: 99%

“…Plot of .X 2 sol ¡ X 2 sil =½ sol / versus Á 2 sil for the solvents used to deposit the silane onto the E-glass bres (ethanol, methanol, THF, acetone, toluene, and CCl 4 ). Also predicted is the behaviour of the surface of E-glass bres treated with the ureidosilane using the following solvents: 2-butanol, chloroform, dichloromethane and hexanol [4]. sol ¡ X 2 sil =½ sol / for fully hydrolysed ureidosilane versus IEP of silane-treated E-glass bres using acetone, CCl 4 , ethanol, THF, toluene, and water as deposition solvents.…”

Section: Figure 14mentioning

confidence: 99%

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Ureidosilanes on E-glass fibres: deposition and surface characteristics

Watson¹,

Kaunisto²,

Rosenholm³

2002

Journal of Adhesion Science and Technology

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The behaviour of methoxy-and ethoxy-ureidosilanes deposited onto E-glass bres from both organic and aqueous solutions is reviewed.°-Ureidopropyltri(m)ethoxysilanes are used as coupling agents for paints to metal surfaces, but they have not found much use as coupling agents for E-glass bres. On metal surfaces, the silane is deposited with the ureido-functional group outermost, available for reaction with a paint / polymer matrix. On E-glass surfaces, however, unless speci c conditions are employed, ureidosilanes tend to deposit with a highly cross-linked siloxane surface. The silanol groups condense not only with silanols of adjacent silanes and the E-glass surface, but also with aluminium hydroxides leached from the E-glass surface. This forms a highly cross-linked aluminosiloxane outer layer. The aluminosiloxane forms at all pHs between 4 and 10, and also when a range of organic deposition solvents is used. 29 Si-NMR results are presented which illustrate the high level of condensation; silane to silicate binding via the amino group was not detected. A small proportion of Si O Si (silane-glass) bonds was inferred, indicating that a small number of sparsely distributed Si O Si links bound the silane to the surface. Electrokinetic analysis of the surfaces con rmed patchy deposition with a siloxane outer surface. Using AFM and ab initio calculations, it was estimated that the patchwise deposition of the silane was in the form of bilayers (or multiples of bilayers). The bilayer structure consisted of siloxane outer layers, with the inner ureido layers forming hydrogen bonds. A graphical t using the mole and volume fractions of silane and organic solvents con rmed the various types of siloxane surfaces as deposited from different organic solvents. Chlorinated solvents tended to produce a ureido outer surface, which was condensed, but solventswollen; deposition from alcohol and acetone resulted in a siloxane surface. Toluene and THF both produced minimally condensed ureido surfaces, which were easily removed by washing with methylene chloride.

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“…Thus the good mechanical properties of glass fibers are kept. The organofunctional silane or coupling agent insures compatibility between the fiber and the matrix through covalent bonds with glass after the silane hydrolysis 7,8 and with the matrix.…”

Section: Introductionmentioning

confidence: 99%

How do silanes affect the lubricating properties of cationic double chain surfactant on silica surfaces?

Beauvais

Serreau

Heitz

2009

Journal of Colloid and Interface Science

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The effect of an aminosilane on the lubricant properties of a C 18 double-chained cationic surfactant has been investigated in the context of glass fiber forming process. The surfactant adsorption The aminosilane on its own has no lubricant property and reduces or even suppresses the cationic surfactant adsorption on silica. However, the silica-silica contact is lubricated even if the 2 infrared spectroscopy does not detect any surfactant adsorption. The repeated contacts and shear due to the friction experiment itself induce accumulation, organization and compactness of surfactant bilayers.

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Adsorption of γ -UPS silane onto E-glass fibers from aqueous solutions

Cited by 3 publications

References 24 publications

Surface-Deposited Acid/Base on Glass Microfibers in Formation of (3-Aminopropyl)triethoxysilane-[2-(3,4-epoxycyclohexyl)ethyl]heptaisobutyl- octasilsesquioxane Bioverlay

Surface-Deposited Acid/Base on Glass Microfibers in Formation of (3-Aminopropyl)triethoxysilane-[2-(3,4-epoxycyclohexyl)ethyl]heptaisobutyl- octasilsesquioxane Bioverlay

Ureidosilanes on E-glass fibres: deposition and surface characteristics

How do silanes affect the lubricating properties of cationic double chain surfactant on silica surfaces?

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