Silanes phenyltrimethoxysilane

Oxane bonds, M—O—Si, are hydroly2ed during prolonged exposure to water but reform when dried. Adhesion in composites is maintained by controlling conditions favorable for equiUbrium oxane formation, ie, maximum initial oxane bonding, minimum penetration of water to the interface, and optimum morphology for retention of silanols at the interface. The inclusion of a hydrophobic silane, such as phenyltrimethoxysilane [2996-92-17, with the organofunctional silane increases thermal stabiUty of the silane and make the bond more water resistant (42). 

Silane coupling agents may contribute hydrophilic properties to the interface, especially when amino functional silanes, such as epoxies and urethane silanes, are used as primers for reactive polymers. The primer may supply much more amine functionality than can possibly react with the resin at the interphase. Those amines that could not react are hydrophilic and, therefore, responsible for the poor water resistance of bonds. An effective way to use hydrophilic silanes is to blend them with hydrophobic silanes such as phenyltrimethoxysilane. Mixed siloxane primers also have an improved thermal stability, which is typical for aromatic silicones [42]. 

In addition, commercially available phenyltrimethoxysilane has been successfully cross-coupled with heteroaryl bromides including both bromopyridines and bromothiophenes [105], Both 2-bromopyridine and 3-bromopyridine were coupled with phenyltrimethoxysilane to give the corresponding phenylpyridines in 76% and 62% yield, respectively. Employing phenyl tris(trifluoroethoxy)silane, a siloxane with electron-withdrawing groups, did not improve the yields. 

Figure 2. Transmission 1R spectra of the silanes used in the primer. (A) Phenyltrimethoxysilane (B) 2-aminoethyl-3-aminopropyltrimethoxysilane.

Host 24 also stabilises highly reactive cyclic silanol oligomers by a similar in situ synthesis [66]. Phenyltrimethoxysilane, 26, rapidly forms polymeric material in aqueous solutions. The presence of 24 prevents this from occurring and isolates the cyclic trimer intermediate, 27. Several molecules of the silane starting... 

TBAF can promote hiaryl formation from triaflyl(aryl)silanes and a wide variety of aryl halide suhstrates. For example, chlorobenzenes undergo smooth cross-couphng with triallyl(aryl)silanes to give biaryls in good to excellent yields (eq 31). Surprisingly, an appreciable amount of added water is required to achieve high yields however, the role of added water is not yet clear.In a recent variant of the Hiyama reaction, TBAF and palladium-coated nickel nanoclusters were employed to prepare biaryl compounds from aryl bromides and phenyltrimethoxysilane. ... 

Trimethoxy (2-methylpropyl) silane. See Isobutyltrimethoxysilane Trimethoxymethylsilane. See Methyltrimethoxysilane Trimethoxy [2-(7-oxabicyclo [4.1.0] hept-3-yl) ethyl] silane. See 2 (3,4-Epoxycyclohexyl)ethyltrimethoxysilane Trimethoxyphenylsilane. See Phenyltrimethoxysilane Trimethoxypropylsilane. See n-Propyltrimethoxysilane (Trimethoxysilyl) benzene. See Phenyltrimethoxysilane (Trimethoxysilyl) ethene. See Vinyltrimethoxysilane 3-(2-Trimethoxysilylethyl) cyclohexene oxide. See 2-(3,4-Epoxycyclohexyl) ethyltrimethoxysilane... 

When phenyltri(methoxy)silane was reacted with water in the presence of sodium hydroxide (Si Na H20= 1.0 1.0 1.0) in /-propanol or /-butanol, all-cis-Ph-T4-tetrol was formed. Meanwhile, when phenyltrimethoxysilane (0.24 mol) was treated with sodium hydroxide in the molar ratio of Si sodium= 2 1 at the refluxing temperature of /-propanol (240 mL) for 4h under nitrogen, a crystalline compound was formed." " After 40 h of stirring, a product with 1379.47m/z (calculated 1379.24) and two Si signals at —76.12 and —78.94 (Os /Ph) was obtained after trimethylsilyl (TMS) capping, which was determined as tetrakis (TMS)-Ph-Tg-tetrol (68.2% yield). Single crystal XRD analysis of the compound after neutralization conhrmed the double-decker structure. The XRD structure is shown in Figure 4.18. 

Silane, phenylmethyl-. See Phenylmethylsilane Silane, phenyltrichloro-. See Phenyltrichlorosilane Silane, phenyltrimethoxy-. See Phenyltrimethoxysilane Silane, propyltriethoxy-. See Propyltriethoxysilane... 

The prepolymer can be synthesized by a simple one-pot synthesis . During a first step an NCO-terminated prepolymer is prepared by a reaction of the polyol with an excess of TDI. The second step comprises the reaction of all remaining NCO groups with the silane 1. Phenyltrimethoxysilane 2 serves to reduce the viscosity of the prepolymer mixture. It has already been added during the prepolymer synthesis. 

Like the above-mentioned prepolymers endcapped with a-NCO-silanes, the silane-terminated prepolymers generated from the a-silane 1 also show dramatically enhanced reactivities and curing rates. As these prepolymers are much more reactive than conventional silanes, a low-cost compound like phenyltrimethoxysilane 2 can be added to adjust the viscosity of the prepolymer without any decrease in the curing speed. 

The thermal stability of several commercial silanes was studied by determining isothermal weight loss of the hydrolyzed silsequioxane form of the silanes (RSiOj ) at 300°C [11]. Fig. 25.5 shows that the phenylsilyl structure has very good thermal stability, but that the diaminosilane has poorer thermal stability. The vinylbenzylaminosilane has surprising good thermal stability. Phenyltrimethoxysilane blends or vinylbenzylaminosilane have been recommended for high-temperature applications. 

Phenyl Phenyltrimethoxysilane Hydrophobing, dispersing aid for minerals, blends with silanes, thermal stability... 

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