Estimation of the equation of state exchange energy and entropy parameters of a polymer‐solvent pair by intrinsic viscosity measurements

The intrinsic viscosity data of linear poly(4‐chlorostyrene) in n ‐propylbenzene and isopropylbenzene were used to estimate the equation of state exchange energy ( X 12 ) and entropy ( Q 12 ) parameters. The quantities estimated for X 12 were 6.7 and 8.1 J cm −3 and those of Q 12 were −0.069 and −0.063 J cm −3 deg −1 in n ‐propylbenzene and isopropylbenzene, respectively. The average values of the chain unperturbed dimension constant ( K o ) and the characteristic ratio ( C x ) were found to be 0.55 × 10 −3 dl mol 1/2 g −3/2 and 10.54, respectively, from the intrinsic viscosities measured at the corresponding θ‐temperatures.