VAPOR-LIQUID-EQUILIBRIA FOR POLYISOBUTYLENE SOLUTIONS
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abstract
In the reported experiments, vapor sorption isotherms in binary solutions of polyisobutylene (PIB), (M// eta equals 4. 7 multiplied by 10**6 g/mol) in hydrocarbons (cyclopentane; cyclohexane; n-heptane; 2,2-dimethyl butane; and 2,2,4-trimethyl pentane) and chlorinated methanes left bracket carbon tetrachloride (CCl//4) and chloroform (CHCl//3) right bracket have been determined at 23. 5 degree C using the piezoelectric sorption method. The polymer-solvent interaction parameter chi obtained agrees with previously published values determined by using the gas-liquid chromatography and a quartz-helix vapor sorption apparatus. The Flory theory of corresponding-states has been applied to the experimental results through the chi parameter and affords a good prediction of the concentration dependence of chi for solutions of chloroform, carbon tetrachloride, n-heptane, and 2,2-dimethyl butane in PIB. The experimental values of left bracket PARTIAL (a//1/ psi //1)/ PARTIAL a//1 right bracket //T//,//P for the PIB solutions are constant over the measured concentration range. The correlation beteen the values of left bracket PARTIAL (a//1/ psi //1)/ PARTIAL a//1 right bracket //T//,//P and the theories of Guggenheim, Miller, Huggins, and Flory are discussed.
