In-depth radiative heat transmittance through polypropylene/nanoclay composites

Transmitted heat was measured as a function of time, revealing different trends for the different compositions. In particular, the formation of bubbles in the range of 100 μm was observed in the presence of sodium montmorillonite and proved to be related to moisture release during the early stage of irradiation from the external heat source. The presence of such bubbles may scatter infrared radiation, resulting into a lower heat transmittance through the material.