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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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Journal ArticleDOI
J. E. Mark1, Y.-P. Ning1, C.-Y. Jiang1, M.-Y. Tang1, W.C. Roth2 
01 Dec 1985-Polymer
TL;DR: In this paper, transmission electron microscopy is used to characterize reinforcing silica particle precipitated as filler into networks of poly(dimethylsiloxane) by the hydrolysis of tetraethylorthosilicate.

53 citations

Journal ArticleDOI
TL;DR: In this paper, the authors compared different types of filler and found that the mean distance between particles did not alter Payne effect, while the amount and morphology of the fillers played a major role on the macroscopic properties.
Abstract: Composites that incorporate precipitated silica into a vulcanized rubber were investigated for dynamic mechanical properties. Comparing different types of filler, it was found that the mean distance between particles did not alter Payne effect. On the contrary, the amount and morphology of the fillers played a major role on the macroscopic properties. The nature and amount of coupling or covering agents was also found to be an important parameter. A direct relationship between length and efficiency of interface agents was evidenced: longer silanes were more effective than shorter once independently from a covalent bounding to rubber. The set of studied parameters affecting Payne effect can be reduced to only two independents variables: the total amount of silica-rubber interface (a function of the amount of filler and its BET surface) and the quantity and nature of interface agent. From these data an attempt to relate the rubber to filler cohesion to Payne effect is proposed as well as a molecular mechanism derived from Maier and Goritz model. A mathematical treatment of the proposed mechanisms is currently being investigated that might help giving further insights on novel ways to further reduce Payne effect.

53 citations

Journal ArticleDOI
01 Nov 2004-Polymer
TL;DR: The morphology, mechanical, and barrier properties of composites derived from phosphonium bromide ionomer derivatives of an isobutylene-based elastomer (IIR-PPh3Br) are compared with analogous non-ionic composites as discussed by the authors.

52 citations

Journal ArticleDOI
TL;DR: In this paper, several novel fillers, specifically silica-titania, silica zirconia, and silica alumina mixed oxides, have been successfully precipitated into poly(dimethylsiloxane) (PDMS) networks using a sol-gel approach.
Abstract: Several novel fillers, specifically silica–titania, silica–zirconia, and silica–alumina mixed oxides, have been successfully precipitated into poly(dimethylsiloxane) (PDMS) networks using a sol-gel approach. The resulting filled networks were found to have very good mechanical properties. In comparison with networks filled only with silica, these materials had good extensibilities as well as high strengths. Filler particle diameters were generally several hundred angstroms, but were found to decrease with increase in crosslink density of the networks. The distributions of particle size were relatively narrow, and there was very little particle aggregation. The presence of in situ silica–titania and silica–zirconia mixed oxides can also increase the onset temperature for degradation of the PDMS. © 1995 John Wiley & Sons, Inc.

52 citations

Journal ArticleDOI
TL;DR: In this paper, as-synthesized MCM-48 was modified via silylation with Cl−Si(CH3)3 to obtain a well-ordered long-range structure, a narrow distribution of nanosized pore diameters, a high mesoporous volume, a large specific surface area and a hydrophobic surface.
Abstract: As-synthesized MCM-48 was modified via silylation with Cl−Si(CH3)3. The resulting silylated MCM-48 possesses a well-ordered long-range structure, a narrow distribution of nanosized pore diameters, a high mesoporous volume, a large specific surface area, and, most significantly, a hydrophobic surface. A nanocomposite structure based on silylated MCM-48 and poly(vinyl acetate) (PVAc) has been prepared through both in situ polymerization and incorporation of preformed polymer. Characterization by FT-IR, XRD, and N2 adsorption−desorption techniques indicates the latter method is more effective than the in situ polymerization method. The composites obtained by addition of the PVAc/silylated MCM-48 particles to a PVAc matrix have significantly enhanced mechanical performance, including toughness and elasticity, when compared with PVAc itself or with composites derived from PVAc and pure silylated MCM-48 or precipitated silica.

51 citations


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