K for Addition of Substituted Propyl Radicals to Meth acrylate Esters

Penultimate unit effects are also important in both substitution40 41 and in addition-fragmentation chain transfer.42 44 Some examples are provided in Sections 6.2, 6.2.2.4, 6.2.3.4 and 9.5. 

Rased on the above data, it would seem unusual if reactivity of the propagating species in copolymerization were insensitive to the nature of the last added monomer units. However, while there are ample experimental data to suggest that copolymerizations should be subject to penultimate unit effects that affect the rate and/or copolymer composition, the origin and magnitude of the effect is not always easily predictable. 

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Table 7.4 Rate Constants (298 K) for Addition of Substituted Propyl Radicals to (Meth)acrylate Esters (Scheme 7.4)35...

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