Working on compatibility of different monomers with each other for coploymerization
The "classic" answer is given by the reactivity ratios values (G. Odian, 2004) when one of them is very small, which is your in this case. However, the Ultimate (Mayo-Lewis) model does not explain the inhibition that occurs in this reaction. Another proposed response was provided by Walling (J Am Ch Soc 1949) in terms of polarity and a parameter named "fi" that accounts for the killing if opposite radicals.
The "classic" answer is given by the reactivity ratios values (G. Odian, 2004) when one of them is very small, which is your in this case. However, the Ultimate (Mayo-Lewis) model does not explain the inhibition that occurs in this reaction. Another proposed response was provided by Walling (J Am Ch Soc 1949) in terms of polarity and a parameter named "fi" that accounts for the killing if opposite radicals.
Have you looked at this reference ?
Bataille et al.
Journal of Polymer Science: Polymer Chemistry Edition
Volume 16, Issue 10, pages 2527–2538, October 1978
Incompatibility of chemically different structures, in copolymerization, is the rule rather than the exception. Styrene, alone, can homopolymerize easily to give high average molecular weight and this applies to vinyl acetate. Since both monomers will be mixed to undergo copolymerization, the entropy of mixing of such system will be very small (because each monomer prefers to polymerize alone). Therefore, a very small heat of mixing suffices to result in a positive Gibbs free energy of mixing, and thus incompatibility.
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