Trimethoxysilane vinyl

In the context of NHC/metal catalysed cross-coupling reactions, the only example of a Hiyama reaction was reported by Nolan using an in situ protocol by mixing Pd(OAc)j and IPr HCl for the formation of the catalyst. Activated aryl bromides and chlorides, such as 2-chloropyridine, were coupled with phenyl and vinyl-trimethoxysilane in good yields [123] (Scheme 6.39). 

Scheme 6.39 Hiyama coupling between activated aryl bromides/chlorides and phenyl/vinyl-trimethoxysilane...

Copolymer of diallyldimethyl ammonium chloride and vinyl trimethoxysilane WiO ... 

Copolymer of Diallyldimethyl Ammonium Chloride and Vinyl Trimethoxysilane... 

In particular, copolymers of diallyldimethyl ammonium chloride and vinyl trimethoxysilane will have a molecular weight in the range from 100,000 to 1,000,000 Dalton. 

Compared to the bulky VTIPS and MTIPS, the analogous trimethoxy-substituted silanes would be expected to hydrolyze to a much greater extent under the same reaction conditions. This is borne out by experiment the following table shows the percent of alkoxy groups that hydrolyze during the synthesis of silylated latexes containing 0.25 mol percent mefliacryloxypropyl trimethoxysilane (MTMS) and vinyl trimethoxysilane (VTMS), respectively. 

Vinyl trimethoxysilane grafted polyethylene and their analogous copolymers are commercially available from Borealis, Dow, TT Electronics (AEI), Crosspolimeri... 

Very low density PE (VLDPE), 52 Vinizene BP 5-5, 449 Vinyl alkoxysilanes, 172 Vinyl silanes, 172 Vinyl trimethoxysilane grafted polyethylene, 172 Vinyltriethoxy-silane, 194 Virgin plastics, 51 Viscoelastic behavior, 225 Viscoelastic fluid, 622 Viscoelastic materials, 631 Viscosity of polyethylene hot melts, 633 Viscosity of polymers, 620 Viscosity of water, 620 Viscosity, 622... 

Clarke recently reported the first MW-accelerated Hiyama coupling [89, 90]. It was noted that the availability and nontoxic attributes of the organosilicon reactants make them very attractive in synthesis, but their low nucleophilicity limits their potential. Use of microwaves enabled aryl bromides and activated aryl chlorides to react under palladium catalysis with an electron-rich N-methyl piperazine/cyclohexyl phosphine ligand (Scheme 15.48). A vinylation reaction with vinyl trimethoxysilane was also reported [90]. 

T. Wydeven developed a plasma process that significantly improves the hardness of optical lenses and, consequently, leads to greater scratch resistance (7. Vinyl-trimethoxysilane films were deposited on transparent polycarbonate lenses by plasma polymerization. The adherent, clear films protect the substrate from abrasion and also serve as antireflection coatings. Post-treatment of the vinyltrimethoxysilane films in an oxygen glow discharge fui ther improved the abrasion resistance. 

The thermooxidative degradation and SiOx film formation of poly(vinyl imidazole-co-vinyl trimethoxysilane) on copper was investigated. Thermal degradation of the copolymer was catalysed by copper in the film and at the substrate surface. Copper in the copolymer film contributed to the formation of a copper-containing SiOx film during thermal degradation. Copper oxides in the film interacted with the SiOx film to form a copper-rich phase near the film defects and cracks (142). 

Si/I (Si-C) shows a minimum for the deposit obtained from 1.0 wt% solution. Above the 1.0 wt%, the behavior exhibited by the two plots follows that expected from Eq. 2, but the data below this concentration are puzzling. Interestingly, studies by Ishida, et al. (4) of hydrolysis of vinyl-trimethoxysilane (VS) as a function of the silane concentration showed a similar break near 1.0 wt% of VS. 

VTMS Vinyl trimethoxysilane WAXD Wide-angle X-ray diffraction WAXS Wide-angle X-ray scattering XPS X-ray photoelectron spectroscopy ZnSt Zinc stearate... 

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