Abstract
THE relative reactivity of monomers, as characterized by the ratio of propagation rate constar~ts, is of considerable practical importance. The knowledge of these values makes it possible to produce polymers with a certain composition, to obtain the absolute propagation rate constants in a simple manner, to identify the monomer distribution along the chain, and also to establish the mechanism of polymer formation. Considerable advances were made in this direction during copolymerization studies. So far, we know the copolymerization constants (relative reactivities) of more than 2000 combinations involving several hundreds of monomer [I]. As regards the copolycondensation, wider aspects of studies deal chiefly with the synthesis of polycondensed copolymers and their physical properties; for example, more than 500 copolymer systems have been described for copolyamides [2, 3]. The quantitative studies of copolycondensation are only just beginning [4], and the number of monomer systems with known copolycondensation constants (under defined conditions) is not more than 20 [5]. The basis of the calculation of copolycondensation (CPN) constants, involving also heterogeneous conditions, is an equation containing the cop olymer composition [6, 7]: A/Ao=(B/Bo)~ , (l)
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