The effect of the adhesion system on the physico-mechanical and electricalproperties of styrene-butadiene rubber/polyester short-fiber composites

Short fibers attracted the attention of several researchers due to their go od dispersion as well as their advantages on the physico-mechanical and die lectric properties. This work represents a systematic study on the electric al and physico-mechanical properties of styrene-butadiene rubber (SBR) rein forced with polyester short fibers. Next, we point out the influence of the adhesion system HRH (hydrated silica, resorcinol, and hexamethylene-tetram ine), the fiber concentration, and aging on these properties of the investi gated samples. The permittivity epsilon' and the dielectric loss epsilon" for the investig ated samples were determined in the frequency range 100 Hz to 10 MHz. It wa s found that the addition of the tricomponent adhesion system HRH to SBR-po lyester fiber vulcanizates improves the physico-mechanical properties as we ll as the permittivity epsilon', whereas the dielectric loss epsilon" is no t affected. The addition of semireinforcing furnace carbon black facilitate s the compounding of the polyester short fiber with SBR. The study of the t emperature dependence of the dielectric properties of the samples shows an improvement through the measuring temperature range (20-60 degrees C). The presence of the fiber and the adhesion system greatly improves the aging re sistance of the rubber composites.