Microwave-Assisted and Thermal Stepwise Expansion of Oxidized Graphites

摘要

The results of studies of the thermal and microwave-assisted expansion of graphites oxidized with acids are presented. The expansion of oxidized graphites heated to 180–300°C for up to 30 min or exposed to microwave radiation for 3–60 s is demonstrated to be of stepwise character. The bulk density of oxidized graphites as a function of thermal expansion conditions and microwave irradiation duration is determined. The results of studies on the thermal expansion of polymer–oxidized graphite composite materials are reported. Optical microscopy is used to monitor changes in the mean diameter of the filler particles and the mean distances between them in composite materials based on PVC plastigel and low molecular silicone rub-ber upon heating to the point of emergence of electric conduction.