Preparation and properties of thermally conductive polypropylene composites
The majority of polymers possesses low thermal conductivity and behaves as electrical insulators. In this work, the thermal conductivity of polypropylene (PP) was increased by adding thermally conductive fillers, which were boron nitride (BN) and titanium dioxide (TiO2 ). The influence of fillers with different particle sizes/distributions as well as their combinations on the thermal conductivity was systematically investigated at different concentrations. PP/BN composites with a balanced property profile concerning electrical, rheological and mechanical properties were obtained. With a content of 20 vol.-% BN (mean particle size 45 µm) the thermal conductivity was raised above 1 W/mK while the electrical and dielectric properties were only insignificantly affected and melt processability as well as mechanical values of PP were maintained.
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