X = the Flory-Huggins interaction parameter for a polymer and a good solvent, 0.45.
Balsara, N.P. and Nauman, E.B., "The Entropy of Inhomogeneous Polymer-Solvent Systems", J. Poly. Sci.: Part B, Poly. Phys., 26, 1077-1086 (1988)
k = 5 x 10–8 N at 373 K
Rgyr = radius of gyration of polymer = 9 x 10–16 m2
Vmolar = molar volume of solvent
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