Thermal properties of carbonized composite materials based on carbon filled elastomeric matrices

Abstract

AbstractThe paper presents the results of thermal studies of carbonized composites based on carbon filled nitrile-butadiene rubber. It was shown that carbon fibers (CF) increase the thermal conductivity of the composites and reduce their linear expansion, whereas carbon nanotubes (CNTs) practically do not change the linear expansion of the composites; instead, they effectively increase their thermal conductivity. The thermal conductivity of the composites with 25 PHR of CNTs exceeds the thermal conductivity of the composites reinforced with 25 and 50 PHR of CF. Thus, CNTs more effectively increase thermal conductivity than CF due to the appearance of additional heat transfer bridges. It was found that the composites have very high values of the storage modulus at room temperature (16–20 GPa), and it is about 4–5 GPa at 300°C, which is almost impossible for traditional polymer matrix composites.