  o, m, p-xylene, p-dichlorobenzene, 1,2,4 trichlorobenzene and naphthalene
were calibrated as condensates used in thermoporosimetry technique. Exponential
relationships were found connecting the pore radii (Rp(nm)) and dT (C) on one
side and the apparent energy of crystallization (Wa (J.cm-3)) and dT on the
other side: Pore or mesh size distribution can be derived from DSC thermal
recording using the following equation: All the numerical parameter values were
determined. Polyethylene and polypropylene samples, cross-linked with
high-energy electrons or &#947;-rays, were submitted to thermoporosimetry
study. The mesh size distributions (MSD) calculated for these polyolefins,
using o, m and p-xylene as solvent, were found in the same sequences that their
degrees of swelling and the irradiation doses they received.

Materials Science