The random phase approximation is a mean-field approach to calculate the linear response of a polymer blend following a thermodynamic fluctuation. This, roughly, tells us how the arrangement of our atoms and components, influences the intensity of the scattered beam. For more structurally detailed calculations, please refer to the LCT calculation of the structure factor (coming soon).
The app simply provides a calculation of this using 6 parameters: Degree of Polymerization of A, B; Statistical segment length of A, B; Volume fraction of A; Flory-Huggins chi parameter. The app outputs a plot of the data with representative values included in a table. Note: Chi values must be chosen reasonably, and a large chi value will not hold, provide unsavory (yet mathematically valid) results.