"FLORY-HUGGGINS FORMULA, VAPOR PRESSURE OF SOLVENT ABOVE SOLUTION, (P0, ß), NONLINEAR REGRESSION. The vapor pressure P (in torr) of the solvent in a two component solution of the solvent (like benzene) and a nonvolatile component (like rubber or polybutadiene), is given by the Flory- Huggins formula. P0 (in torr) is the saturated vapor pressure of pure solvent atSTP. Φ is the volume fraction of solute and ß is a constant. Experimentally measures data are usually P and Φ. *** Answer(s) to Problem(s) **** (c) Copyright PCSCC, Inc., 1993The equations and data are included. The total squared error between the active dependent variable P (or response) and the Φ values of the 6 data points with each of the 6 data coordinates or Φ values substituted into the coordinate Φ variables (or predictor) is minimized. Equation Θ is inactive (no '='). Φ is coordinate (':'). To solve, type S. Use default tolerance, type (enter). After iterations, P0 = 121.6 torr and ß =0.462. Type any key to exit. ||Calculate P0 and ß for a solution of rubber in benzene using the Flory-Huggins model. Data in (Φ,P) pairs are: (0.119,121.5), (0.312,119.2), (0.524,111.6), (0.727,87.6), (0.945,25.8) and (0.969,15.1) (from Gee, G. and Orr, W. J. C., Part VIII, Trans. Faraday Soc. 42, 507(1946).). Type comma key to see entire comment. Type (F2) to return to application file."
