The Effect of Molding Process and Test Conditions on the Thermal Conductivity of Polypropylene/Graphite Composites
The thermal conductive composites prepared by twin-screw extrusion extrudes polypropylene and graphite.This paper studies the influence of molding process on the thermal conductivity.The experimental results show that thermal conductivity of composites changes with the screw rotate speed changing,obtaining the maximum when the screw rotate speed is 300r/min.Results indicate that the opposite trend with thermal conductivity and the melt index and injection speed,and the injection temperature has not a big influence on the thermal conductivity. The crystallization influences the electrical conductivity and density of some points of molding samples.In addition,the test condition has cast impact on thermal conductivity,in the lower temperature(lower than the Debye temperature),the thermal conductivity of composites increased with the of temperature and humidity increasing.
S. Yan et al., "The Effect of Molding Process and Test Conditions on the Thermal Conductivity of Polypropylene/Graphite Composites", Advanced Materials Research, Vols. 588-589, pp. 1702-1708, 2012