A STUDY OF THE THERMODYNAMICAL INTERACTIONS OF BISPHENOL-A POLYCARBONATE WITH SOME SOLVENTS BY GAS-CHROMATOGRAPHY

Retentin diagrams of polycarbonate for n-nonane, ethyl acetate and n-b utyl acetate were obtained using inverse gas chromatography in the tem perature range 80-240 degrees C. The specific retention volumes, V-g(o ) the Flory-Huggins interaction parmeters, chi(12)(infinity), interact ion parameters, chi(12), and effective exchange-energy parameters (X) over bar(12) of the equation-of-state theory of polycarbonate for n-o ctane, n-nonane, n-decane, ethyl acetate, isopropyl acetate, n-butyl a cetate, isobutyl acetate, tert-butyl acetate and isoamyl acetate were obtained in the temperature range 200-240 degrees C. The parameter del ta(2) was estimated to be 10.7 (cal/cm(3))(1/2) at room temperature us ing the X-12(infinity) extrapolated to room temperature.