Precipitated silica

About: Precipitated silica is a research topic. Over the lifetime, 1401 publications have been published within this topic receiving 20992 citations.

Synthesis and formation mechanism of porous silicon carbide stacked by nanoparticles from precipitated silica/glucose composites

Abstract: Porous silicon carbide (SiC) with a Brunauer–Emmett–Teller specific surface area of 75 m2 g−1 and a pore volume of 0.37 cm3 g−1 was synthesized through a facile process using industrial precipitated silica and glucose. X-ray diffraction, scanning electron microscopy, and transmission electron microscopy analyses indicated that the SiC was stacked by β-SiC nanoparticles with size ranging from 60 to 150 nm, and its morphology was similar to that of precipitated silica. Further analysis showed that the formation mechanism of porous SiC was different from the general carbothermal reduction method. The proposed mechanism indicated that precipitated silica is a porous particle stacked by amorphous primary silica nanoparticles. When the temperature was higher than its softening point during the carbothermal reduction reaction, the silica nanoparticles softened and began to change from solid phase to liquid phase with a certain viscosity. Then, the pyrolytic carbon of glucose in contact with silica nanoparticles was diffused into the liquid phase and reacted in situ to form SiC. Precipitated silica served as a template, and SiC inherited its morphology and structure.

Precipitated silica and paper industry/other applications thereof

Abstract: Precipitated silica specifically useful in the paper industry and in particular in paper-coating applications for inject printing, is characterized by an uptake of DOP oil lower than 260 ml/100 g, a pore volume (Vd25) of greater than 0.8 ml/g formed by pores having a diameter of less than 25 nm, a CTAB specific surface area of greater than 280 m2/g.

Influence of epoxidation on physical properties of SBR and its interaction with precipitated silica

Abstract: The introduction of epoxy groups on the main chain of polydiene has emerged as a fruitful route to monitor polymer-filler interactions leading to useful changes of physical properties of the vulcanisates. The in situ epoxidation reaction was chosen to modify polybutadiene and poly(butadiene-co-styrene), due to the easy control of the reaction even for small degrees of epoxidation. The extent of modification of the polymer chain was quantitatively accompanied by means of FT-IR and 1H-NMR spectroscopy. The shifts of the Tg's to higher temperatures with the increase of the epoxy content on the polymer chain was monitored using the DSC analysis. From the temperature and amplitude dependency of the dynamic moduli it can be concluded, that the interaction of the epoxidised rubber matrix with silica is greatly improved even for small contents of epoxy groups in the rubber chains.

Tire tread rubber composition

Abstract: PROBLEM TO BE SOLVED: To provide a tire tread rubber composition capable of securing abrasion resistance while keeping operational performance on the ice in a high level, when the rubber composition is used for tread parts of a pneumatic tire SOLUTION: This tire tread rubber composition contains 15-40 ptswt of carbon black and 20-60 ptswt of precipitated silica based on 100 ptswt of a diene-based rubber containing 40-70 ptswt of a NR(natural rubber), wherein the carbon black has a nitrogen adsorption specific surface area of 100-165 m2/g and a DBP(dibutyl phthalate) absorption of 90-130 ml/100 g, the precipitated silica has a BET(Brunauer-Emmett-Teller) specific surface area of 150-200 m2/g, the total amount of the carbon black and the precipitated silica is 40-90 ptswt, and a weight ratio of the carbon black to the precipitated silica is 025-10 COPYRIGHT: (C)2002,JPO