This paper deals with low-temperature mineralisation of coatings made titania-siloxane compositions (TSC). Methyltriethoxysilane has been adopted as the precursor for siloxane, and during its synthesis, an oligomeric siloxane condensate methyl moieties acting TiO2 binder produced. These moieties, contained in TSC, provide solubility prevent gelling, but reduce hydrophilicity system, transfer el...

Cyclopentadienyl (Cp)-coordinated cationic Si(II) (1) and Ge(II) compounds (2) are a new class of catalysts for various transformations in organosilicon chemistry. This review demonstrates that these effectively catalyze technically important reactions, such as the hydrosilylation carbon-carbon multiple bonds types siloxane-coupling e.g., Piers-Rubinsztajn reaction oxidative siloxane coupling r...

Several polysiloxanes (polydimethyl, polymethyloctadecyl or polymethyltetradecyl-siloxane) were studied by FTIR spectroscopy, densimetry and gel permeation chromatography. Different types of ageings such as thermal ageing (60°C and 100°C), photo-ageing (SEPAP) and acid vapour ageing were performed and compared. Oxidation, chain scission and cross-linking were estimated after ageings. The presen...

Pure gas permeability coefficients of a series of copolymers based on polar, hydrophilic poly(ethylene glycol) dimethacrylate, n 1⁄4 14 (PEGDMA) and siloxane-based co-monomer, [methyl bis(trimethylsiloxy) silyl] propyl glycerol methacrylate (SiGMA) are reported. SiGMA is miscible with PEGDMA and able to form homogeneous films. SiGMA contains a bulky siloxane-based end group, which acts to incre...

Perylenediimide functionalized bridged siloxane nanoparticles were prepared by direct hydrolysis and condensation of a perylenediimide silane precursor in the presence of a catalytic amount of tetraethoxysilane (TEOS). The sizes of the particles were controlled by adjusting organotrialkoxysilane, base, and TEOS concentrations. Using this modified Stöber method, we were able to incorporate a hig...

Chiroptical properties (circular dichroism and circularly polarized luminescence) were induced in lanthanide ions by doping silica nanohelices with a chirally arranged siloxane network without any organic mediates.

A nonplasma technique, hot-filament chemical vapor deposition ~HFCVD!, is an alternative method for producing organosilicon films of novel structure. Films are deposited onto room-temperature substrates from the precursors hexamethylcyclotrisiloxane (D3) and octamethylcyclotetrasiloxane (D4) at high rates ~.1 mm/min!. Filament temperature can be used to control film structure, and the limited r...

The organosilicon compounds octamethylcyclotetrasiloxane (D4), decamethylcyclopentasiloxane (D5), and dodecamethylcyclohexasiloxane (D6) are high production volume chemicals that are widely used in household goods and personal care products. Due to their prevalence and chemical characteristics, cyclic siloxanes are being assessed as possible persistent organic pollutants. D4, D5, and D6 were me...

Previous molecular dynamics simulations have shown that compression of silica glass surfaces occurs upon formation of an interface with a model crystal and that a structural change caused by this process is retained after glass and crystal are separated. The remnant structural modification caused by this stress was an increase in the concentration of siloxane bond angles less than 1508 in the n...