Abstract: Modified rubber powder was prepared by treating waste tire rubber powder with silane coupling agent (KH560). Polyaniline/ modified rubber powder conductive blends were prepared by insitu polymerization and using ammonium persulfate as initiator. The effect of the ratio of raw materials, the reaction temperature and time on the conductivity of the blends was studied by Fourier transform infrared spectroscopy (FTIR), scanning electron microscope (SEM), energy dispersive spectrometer (EDS), four-probe resistivity meter, and electrochemical workstation. It showed that the dispersion of rubber powders was significantly improved through modification. The conductivity of polyaniline/modified rubber powder conductive blends reached 4.79 S/cm under the conditions of the temperature of 10 ℃, the ratio of ammonium persulfate to aniline of 1∶1, the concentration of hydrochloric acid of 1.0 mol/L, and the reaction time of 10 h.

Key words: Key words: waste tire rubber powders, silane coupling agent, composite conductive rubber powders, dispersion, conductivity