HIGHLIGHTS
SUMMARY
Introduced for the first time by Batshinski1 to explain the viscosity of non-associated liquids, the concept of free volume has been subsequently extended to macromolecules, in correlation with temperature and molecular dimensions, by various theories proposed starting from the 1950s. It has been remarked that the free volume is rather ambiguously defined being based on the occupied volume, of which different definitions exist. Among the theories which include the free volume, the Simha-Somcynsky latticehole model8 has been successfully applied to more than 50 amorphous polymers and blends at equilibrium. Experimentally, it is . . .
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