Equations for the degree of polymerization and the cooligomer composition in the styrene (A)–methyl methacrylate (B)–CCl 4 (S) system were derived from the assumed reaction scheme by the use of some assumptions for simplification, and their appropriateness was examined. The chain transfer constants of the growing radicals of styrene ( C SA ) and methyl methacrylate ( C SB ) to CCl 4 , which were estimated from the apparent chain transfer constants C SAB in the cooligomerization system, agreed with the homooligomerization values. This means that the degree of the polymerization of the cooligomer can be expressed by the equation: where P n is the degree of polymerization of the cooligomer and P n O is that when no chain transfer agent (CCl 4 ) is added; r A and r B are the monomer reactivity ratios of monomers A and B in this system. The cooligomer composition deviated from the statistical steady‐state composition on the low molecular weight side, and this deviation was explained by the equation:
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Tsuchida et al. (1972) studied this question.
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