Copolymerization equation ideal behavior

Equation (7.13) means that k /ki2 and k2i/k22 wiU be simultaneously either greater or less than unity or in other words, that both radicals prefer to react with the same monomer. Ail copolymers whose Vir2 product equals 1 are therefore called ideal copolymers or random copolymers. Most ionic copolymerizations are characterized by the ideal type of behavior. 

The curve does not intercept the ideal azeotrope line, either, in nonideal nonazeotropic copolymerization. But, in contrast to ideal nonazeotropic copolymerization, the curve is no longer symmetrical. In azeotropic nonideal copolymerizations, behavior depends on whether both copolymerization parameters are or are not of the same magnitude. If they are also equal, then, according to Equation (22-15), the azeotropic point must occur at a 1 1 composition ratio, that is, at a mole fraction of 0.5. If the molar fraction is less than 0.5 for monomer B, then the azeotropic ordinate point must be above the 45° ideal azeotropic line because of the tendency to alternate, but the point... 

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