Journal of Membrane Science, Vol.113, No.1, 57-64, 1996
The Analysis of Sorption Data of Organic Vapors in Polymeric Membranes Through Novel Theories
Analysis of sorption data of hydrocarbon vapors in polyethylene and polypropylene films using Flory-Huggins, UNIFAC, Michael-Hausslein and Flory-Rehner theories are presented. Basically two models are used, one deduced with UNIFAC and Michael-Hausslein (UNIFAC-M-H) approach and the other with UNIFAC and Flory-Rehner (UNIFAC-F-R) theory. Prediction of penetrant activity values through these theories fit quite well the experimental results with errors ranging between 4.7 and 10.8%. The mean arithmetic values of the fraction of elastically effective chain in the amorphous region are f = 0.4915 and f = 0.3354 for polypropylene (PP) and polyethylene (PE), respectively. The experimental results with polypropylene are correlated, establishing a unique expression to predict solubility and solubility coefficient. The dependence of solubility in polypropylene over the whole range of temperature it is also presented.