Abstract
The free-volume hole distribution in polystyrene (T g = 95°C, molar weight 106000) has been investigated as a function of temperature. The hole volume distributions are determined from orthopositronium distributions. The hole volumes are distributed between 35 and 200 A 3 . The fractions of free volumes are distributed from 2.0% to 11% of total volume. The obtained free-volume distributions are compared and discussed with the experimental distributions obtained by photochromic and florescent probes and with the Turnbull-Cohen free-volume theory. The distributions of free-volume fractions fit well with the theoretical function according to the Simha-Somcynsky lattice model
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