Immiscibility Independent components, number

The dimensionless K. is regarded as a function of system T and P only and not of phase compositions. It must be exfjerimentally determined. Reference 64 provides charts of R (T,P) for a number of paraffinic hydrocarbons. K. is found to increase with an increase in system T and decrease with an increase in P. Away from the critical point, it is invariably assumed that the K, values of component i are independent of the other components present in the system. In the absence of experimental data, caution must be exercised in the use of K-factor charts for a given application. The term distribution coefficient is also used in the context of a solute (solid or liquid) distributed between two immiscible liquid phases yj and x. are then the equilibrium mole fractions of solute i in each liquid phase. 

Despite the fact that numerous publications are devoted to the subject of polypropylene-polyetitylene blends, many questions still remain unclear. Moreover, the results of several studies published in the literature contradict one another. A number of researchers consider that the blends of PP and PE are absolutely immiscible, so PP and PE form independent phases in the blend. Consequently, the stmcture and properties of the PP/ PE blends depend on the composition additively [1-4]. Other authors suppose that the PE component influences the behavior and morphology of PP-PE blends, while the PP component has no impact on the properties of the blend [5-7]. Another point of view is that PP and PE have a mutual influence on the crystallization process and the formation of the phase structure and, consequently, the properties of the blend [8, 9]. 

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