Q-e system

The Q,e system of describing the reactivity of monomers in copolymerization gives the rate constant for the addition of monomer 2 to the radical of monomer 1 as... 

Figure 3 shows the correlation obtained by plotting logio (relative rate) as a function of log Q — 0.5 (e + 0.8) for the seven monomers. Over a range of oxidation rates varying by a factor of 100 the relation predicts the rate from Q,e values to less than a factor of 3. This is less precise than the correlation with excitation energies used for alkyl-subsituted ethylenes (18), but is probably all that can be expected, since the Q,e system is an empirical relation and the assumption of equal reactivities and termination rate constants for primary and secondary peroxy radicals is imprecise (9). 

The values of Q and e gathered in Table 8.14 illustrate the two effects of substituents. The Q-e system is an empirical system whose validity is limited it can, however, be used to predict the overall behavior in copolymerization reactions. 

This relationship is called Alfrey-Price s Q-e system ... 

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See also in sourсe #XX -- [ , ]

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