N-mer partition coefficients

In principle the diffusant-solvent or the diffusant-poly-mer interaction parameter can be empirically determined from a single solution datum such as a heat of mixing, a critical temperature, a solution density, etc. However, in some systems intelligent choices of A and Ap can made from limited data. An example of this kind is the partitioning of the n-alkanes between linear polyethylene (PE) and n-heptane. In Table I, the partition coefficients Kp and K are calculated from Eqs. (29) and (22) for selected n-alkanes at 25°C. Equation of state parameters required in the calculations were obtained from references 8 and 9. For PE, the equilibrium amount of n-heptane absorbed is 4>s -26 (16). Entries enclosed within parentheses are K values and those without are Kg values. Entries that are crossed out with solid lines are considered unlikely values of the partition coefficient those with broken lines are considered more probable than those crossed-out with solid lines, but less probable than the clear entries. 

For a simple monosier-n-mer type of self-association, the weight average partition coefficient, d, is the weight average of a, the monomer partition... 

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