The volume fractions of each component at the plait point, (v
1)
pl, (v
2)
pl, and (v
3)
pl, were calculated according to Scott's theoretical equation, in the ternary system, solvent-1, nonsolvent-2 and polymer-3, as the function of interaction parameters A, B, and C. From these calculations, the relative volume of nonsolvent to be added to the system (V/V
0)
pl before the precipitation starts and the initial concentration of polymer (v
3)
0 were calculated for the polymerization degree P=100, 250, 500, 1000, 2500, 5000, 10000, and ∞, and for various values of A, B, and C. From these results it has been concluded that the selection of a solvent and nonsolvent to be used for the fractional precipitation of a polymer should take into consideration the parameter B which is responsible for the interaction between the solvent and the nonsolvent, because the parameter B also affects the precipitation condition of the polymer, although the parameter B itself is not related explicitly to the interaction with the polymer molecules.
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