Miscibility compositional window in terpolymers with common monomers using @RAND in spreadsheet

The compositional window for which two terpolymers with common monomers are miscible can be calculated using a spreadsheet such as Quatrapro V6.0 for Windows. The results are presented as a function of compositional mismatch. The van Laar mixing rule or binary interaction model is used to obtain the compositional window of miscibility. The @RAND key was used to demark the miscible regions from the immiscible ones in the entire compostional range (n/spl times/m/spl times/k/spl times/1 or n/sup 4/) of the terpolymer. The compositional mismatch was defined as the variable. In this approach the compositional window for miscibility can be computed quicker (cN or n).