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ABSTRACT: The lattice fluid theory of solutions is used to calculate heats and volumes of mixing, lower critical solution temperatures, and the enthalpic and entropic components of the chemical potential. Results of these calculations are compared with literature data on several polyisobutylene solutions. In most instances the agreement with experiment is favorable and comparable to that obtained with the Flory equation of state theory. Several insights into polymer solution behavior are obtained and include: (1) differences in equation of state properties of the pure components make an unfavorable entropic contribution to the chemical potential that becomes large and dominant as the gas-liquid critical temperature of the solvent is approached; (2) limited miscibility of nonpolar polymer solutions at low and high temperatures is a manifestation of a polymer solutions small combinatorial entropy; and (3) negative heats of mixing in nonpolar polymer solutions are caused by the solvents tendency to contract when polymer is added. Suggestions on how the theory can be improved are made Freeman and Rowlinson in 1960 observed that several hydrocarbon polymers dissolved in hydrocarbon solvents phase separated a t high temperatures. These nonpolar polymer solutions exhibited what are known as lower
Sánchez et al. (Wed,) studied this question.
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