Polydimethylsiloxane (PDMS) colloidal silica composites prepared with the use of the dispersion of colloidal silica (CS) of similar particle size and distribution in different mediums/solvents are investigated for their rheological, thermal, and mechanical properties. Regardless of the dispersion medium of CS, thermal analysis showed the increased thermal stability of PDMS with the addition of CS. The rheological analysis showed that the composites prepared from CS dispersed in isopropanol (IPA) and CS dispersed in methylethylketone (MEK) showed significant enhancement in viscosity at higher loadings as compare with the composite prepared from the CS dispersed in water and methanol indicating more Filler-polymer interactions. Similarly, the tensile stressstrain curves, hardness, and tear strength displayed significant improvement with PDMS-CS-MEK and PDMS-CS-IPA composites. The results of this study not only provide the insights of solid-liquid-liquid interface leading to different extent of polymer-filler interaction, there by the bulk properties, it also helps to minimize the surface treatment steps while preparing the composites. V C 2012 Wiley Periodicals, Inc. J Appl Polym Sci 125: E515-E522, 2012
Aqueous spherical colloidal silica (CS) particles with a diameter of 15 6 5 nm were modified with three different types of monofunctional silane coupling agents to prepare functionalized colloidal silica (FCS) particles. The effects of the surface chemistry of the FCS were studied as a function of the CS/FCS loading in the poly (dimethyl siloxane) (PDMS) polymer. The prepared PDMS-CS/FCS composites were investigated for their physical properties both in the cured and uncured states. The extent of filler-filler and filler-polymer interactions was found to vary with the type of functionalizing agent used to treat the surface of the CS. The filler-filler interaction appeared to be predominant in the PDMS-CS compo-sites, and improved filler-polymer interaction was indicated in the case of the PDMS-FCS composites. The composites containing CS treated with methyltrimethoxysilane exhibited relatively better optical and mechanical properties compared to the other PDMS-FCS composites. This study highlighted the importance of judiciously choosing functionalizing agents to achieve PDMS-FCS composites with predetermined optical and mechanical properties. V C 2012 Wiley Periodicals, Inc. J Appl Polym Sci 126: [1585][1586][1587][1588][1589][1590][1591][1592] 2012
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