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Product Relation of Copolymerization Reactivity Ratios
Authors:Akira Yamada  Masaya Yanagita
Affiliation:Institute of Physical and Chemical Research , Yamato-Cho, Saitama, Japan
Abstract:The copolymerization reactivity ratios designated as ri = kii/kij are characteristic of thermodynamic conditions, such as temperature, pressure, and concentration, in which the temperature dependence has been demonstrated by kinetic procedures [14]. It is noted that in radical copolymerization the simple product of the reactivity ratios, e.g., r1, r2 generally tends to move toward unity with increasing temperature [2] and that for ionic copolymerization it is usually close to unity [5]. Such an inclination, however, involves some ambiguity in evaluating all the reported data [6] concerning the polymerization conditions.
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