Polydimethylsiloxane Composites Reinforced by Fumed Silica/Mica Hybrid Reinforcers

Abstract

In this study, physical properties of fumed silica and mica hybrid reinforced polydimethylsiloxane composites have been investigated with special reference to the effect of loading composition, degree of cross-linking, and silanization. The composites were prepared via milling technique and were examined in terms of static and dynamic mechanical properties as well as swelling behaviour. Swelling ratio of the composites was found to decrease as mica content increased. Silanization of mica gives rise to a further decrease in swelling. Static mechanical properties of the composites, such as elongation at break, stress at break, and work up to fracture were also found to be enhanced by the addition of mica. Dynamic mechanical spectra were obtained, and the effects of filler and silanization as well as frequency on E', E, and tan δ values were all discussed. In light of this study, we found that, by tailoring the compositions of the composites, it is possible to obtain structures that are resistant to solvents, have good static and dynamic mechanical properties. And also, by adjusting the compositions, composites can become effective dampers in the frequency and temperature range of interest.