LOW-TEMPERATURE THERMAL-CONDUCTIVITY OF AMORPHOUS POLYCARBONAT UNDER HIGH-PRESSURE

We measured the thermal conductivity lambda of Polycarbonat (PC) in th e temperature range from 3 K to 150 K under application of hydrostatic pressure up to 1.3 GPa. A strong influence of pressure on lambda was observed over the entire temperature range. An additional measurement of the pressure dependence of density showed that the density of PC in creases appreciably with pressure. The thermal conductivity data were thus corrected considering the changes of density. The corrected data show an increase of lambda with pressure only in the plateau region of thermal conductivity. Similar results were measured for vitreous sili ca [1] and epoxy resin [2], where the data of vitreous silica show an opposite behaviour of X with increasing pressure.