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Precipitated silica

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


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Patent
12 Mar 1996
TL;DR: A rubber compsn. vulcanisable by sulphur based on dienic polymer contains reinforcement filling of a pptd. silica contg. an Al content of 0.35-3%, relative to silica.
Abstract: A rubber compsn. vulcanisable by sulphur based on dienic polymer contains: (i) a reinforcement filling of a pptd. silica contg. an Al content of 0.35-3%, relative to silica. Also claimed is a rubber tube or belt, made from the new material.

169 citations

Journal ArticleDOI
TL;DR: In this paper, the authors investigated the reaction of precipitated silica with this organosilane and the influence of various parameters on the reaction type and the reaction kinetics was considered, and the results of the investigation obtained using 29Si-CP/MAS solid state NMR spectroscopy agree well with a horizontal reaction model.
Abstract: Silica in combination with organosilanes (e.g. [bis(3-triethoxysilylpropyl)tetrasulfane] = TESPT) has recently become more important in tire applications. Their use in tire treads leads to an improvement in rolling resistance and wet traction. The requirements for the attainment of these properties are, that the triethoxysilyl groups of TESPT react with the silanol groups on the silica surface during compounding, and the polymer active groups react with the polymer during cure. The reaction of precipitated silica with this silane was investigated. The influence of various parameters on the reaction type and the reaction kinetics was considered. The results of the investigation obtained using 29Si-CP/MAS solid state NMR spectroscopy agree well with a horizontal reaction model in which a single siloxane bond is first formed with the silica surface (primary reaction). It is followed by condensation reactions between silanol groups of silane molecules which are already bound to the silica surface (se...

160 citations

Journal ArticleDOI
R.P Abendroth1
01 Dec 1970
TL;DR: In this article, it was shown that Cs+ is better able than Li+ to penetrate any structured water phase existing at the silica surface, in accordance with observed adsorbabilities.
Abstract: Adsorption of hydrogen and hydroxyl ions on a nonporous pyrogenic silica was determined by potentiometric titration in LiCl, KCl, and CsCl electrolytes over the pH range 1.8–9.0. No evidence of hydrogen ion adsorption was found. The sequence of counterion adsorption was Cs+ > K+ > Li+. An attempt was made to increase the extent of surface hydration of this silica by treatment in aqueous solution. This product had the same properties as untreated silica, except for slightly lower charge densities above pH 6. This difference was attributed to adsorption of impurities during treatment rather than to any significant effect of hydration state. Charge densities were found to be somewhat higher than those reported for precipitated silica, but much lower than those reported for microporous silica. Differential capacitance curves indicate the counterions for precipitated silica to be further away from the surface. It is suggested that Cs+, classed as a structure breaker in aqueous solution, is better able than Li+ to penetrate any structured water phase existing at the silica surface, in accordance with observed adsorbabilities.

160 citations

Journal ArticleDOI
TL;DR: In this article, reinforced silica-epoxy vitrimer nanocomposites have been made in a solvent-free, easily processable, and economical way with filler contents up to 40 wt %.
Abstract: Reinforced silica–epoxy vitrimer nanocomposites have been made in a solvent-free, easily processable, and economical way with filler contents up to 40 wt %. Increasing silica content leads to higher modulus materials in both glassy and rubbery regions. These nanocomposites are insoluble like permanent cross-linked networks but can completely relax stresses by thermoactivated exchange reactions that rearrange the network topology. Furthermore, the surface functionalization of particles improves the dispersion of fillers and accelerates the relaxation process. Similar results were obtained with industrial precipitated silica, which would allow vitrimer nanocomposites to be produced on an industrial scale.

152 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20236
202217
202118
202030
201931
201841