Reversible Heat of Polymer Transfer Between Sol and Gel

The dependencies from Table 2 or Figs. 9 to 11 can be applied to calculate the reversible heat of transfer of a P-mer from the gel into the sol in a PDC-column kept at a constant temperature T. As the enthalpy difference (Hg — Hs)rev = RT2 0 In K/0T 

Excellent measurements 14 of each of these terms in several solvents show that only the last mixing term is constant with respect to the degree of polymerization P, whereas the other two terms are P-dependent. Hence, applying Hess law, (Hs — Hg)rev = AH8(gel + sol) = AHs(glass -+ sol) — AHs(glass - gel), and comparing the result with Eq. (7), the thermodynamic meaning of both terms of Eq. (7) is obtained The second term 

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