Preparationand identification polysiloxane by the sol-gel process and modification by silver particles

Polysiloxane (PMSQ) microsphere is a type of organosilicone materials with the molecular structure of RSiO3/2, where R represents the organic groups such as methyl, phenyl, mercapto, amine, epoxy acrylic and isocyanate. With the specific organic-inorganic hybrid structure and regular morphology (mono-dispersed sphere with size ranging from nano - to micro-meter), PAMSQ microsphere has been widely applied in chemistry and physic fields. Poly (aminopropyl/methyl) silsesquioxane (PAMSQ) particles were obtained by hydrolytic co-condensation of 3- aminopropyltriethoxysilane (APTES) with methyltrimethoxysilane (MTMS) in aqueous medium. Synthesis of polysilsesquioxane (PAMSQ) particles is reported here. Synthesis of PAMSQ particles with controllable amount of aminopropyl functional groups using APTES and MTMS as precursors by hydrolytic co-condensation process were conducted. Generally, hydrolytic condensation of the organotrimethoxysilanes in water or ethanolwater was quite rapid under basic conditions. Initial hydrolysis of the APTES and MTMS resulted in silanol oligomers. Silanol (Si–OH) was very reactive and then condensed to form polysilsesquioxanes in the presence of base catalyst.For PAMSQ preparation, 3-aminopropyl triethoxy silane (3ml) was dissolved in MTMS (3ml) and after 10 minutes 60 ml of water to this solution, whit continuous stirring. So that the molar concentration of APTES / MTMS in the mixture is 4:6. A white colored precipitate gradually formed within 10 min and was stirred at ambient temperature for 24 h for the reaction to reach completion. The material formed was dried at 50 °C for 14 h. Yield 2 g. The final products were thoroughly characterized by Fourier Transform Infrared spectroscopy (FT-IR), X-ray powder diffraction (XRD), Field Emission Scanning Electron Microscopy (FE-SEM) along with Energy Dispersive X-ray (EDX) Spectroscopy, thermo gravimetric and differential thermal analysis (TG/DTA) and X-ray photoelectron spectroscopy (XPS) [1] Synthesis of micron-SiO2 nano Ag particles: In this paper Micron-SiO2 nano Ag particle shave been synthesized using a certain amount AgNO3 aqueous solution and PAMSQ. Then NaBH4 (10ml) dropped into Relevant solution and stirred at room temperature for 5 h. The reaction After 5 h of stirring, the solution changed to dark color which illustrated that the reduction of Ag+ was completed. Finally, the as synthesized particles were dried at 60◦C in the oven [2].