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THERMAL CONDUCTIVITY OF COMPOSITE POLYPROPYLENE/CARBON NANOFIBRES

The polymer composite material based on polypropylene (PP) matrix and vapor grown carbon fibers (VGCF) as filler was received by the melt-technology. Dependences of the thermal conductivity on the filler mass fraction and temperature were experimentally obtained. Such dependences have a nearly linear character. It is shown that the material heat-conducting properties don’t depend on the sample geometry. It is found out that in case the concentration of VGCF is more than 5% the material can be used for heat removal in electrical and electronic devices. To describe the heat transfer process a model was built based on the multichannel conduction problem. It allows describing the heat transfer process in composite materials with sharply differing heat-conducting properties of the components taking into account such material characteristics as density, heat capacity, heat conduction, and heat flow velocity.