THERMOPHYSICAL PROPERTIES OF N-VINYL PYRROLIDONE-METHYL METHACRYLATE COPOLYMER SOLUTIONS

The thermal properties-thermal conductivity, thermal diffusivity and s pecific heat capacity, of N-vinyl pyrrolidone (NVP)-methyl methacrylat e (MMA) copolymer solutions in benzene have been studied in the temper ature range 20-70-degrees-C. The measurements have been carried out us ing the hot-wire (and strip) technique. The NVP-MMA copolymer samples of various molar ratios are prepared in absence and in presence of ZnC l2 as modifier during the copolymerization process. The results show t hat the values of the thermal properties depend on the content of NVP monomeric units in the polymeric chains, the presence of ZnCl2 during the copolymerization of the two monomers, and the temperature. The mec hanism of heat transfer is discussed. The role of convection and radia tion have been taken into consideration.