Abstract
Thermal conductivities of organic materials like paraffin, polyethylene, polypropylene and naphthalene were measured in the course of melting and/or solidification by the combined method of a D.S.C. and a D.T.A. The melting and/or solidification processes of these organic materials were theoretically analyzed on the basis of thermal conductivity data thus measured, and the calculated rates were compared with the experimental data.
(i) It was found from the D.S.C. data that paraffin, polyethylene and polypropylene melted within a zone around a respective fixed melting temperature, with a constant width (zone-melting), independent of heating rates.
(ii) From the D.T.A. data, thermal conductivities of paraffin, polyethylene, polypropylene and naphtalene in the course of melting and/or solidification found to be almost constant and nearly to equal that of the liquid state for each material.
(iii) The theoretical results for melting rates of these materials coincided fairly well with the measured data, while for the solidification analysis, more precise examination on the crystal growth rate is likely to be needed.
