THERMAL-CONDUCTIVITY AND HEAT-CAPACITY PER UNIT VOLUME OF POLY(METHYL METHACRYLATE) UNDER HIGH-PRESSURE

The thermal conductivity and heat capacity per unit Volume of poly(methyl methacrylate) (25 and 350 kg mol(-1) in molecular weight) have been measured in the temperature range 155-358 K at pressures up to 2GPa using the transient hot-wire method. The bulk modulus has been measured up to 1.0 GPa at 294 K and yielded a constant value g = 3.4 +/- 0.3 for the Bridgman parameter. No dependence on molecular weight could be detected in the properties we measured.