It is argued that gas separation properties (in particular, selectivity) of glassy polymers are better correlated with the kinetic free volume fraction, fK = 1 - Ka/K~, rather than with the geometrical counterpart, f6 = 1 - Ka (where Ka and K? are the molecular packing coefficients in the amorphous and crystalline states, respectively).
Посилання на статтю:
Kinetic free volume controlled gas separation properties of glassy polyheteroarylenes / Valery P. Privalko // Polymer. – 1992. – Vol 33. – P. 2452-2453.