Copolymerization of styrene. IV. Copolymerization with esters of benzylidenecyanoacetic acid

摘要

AbstractStyrene was copolymerized in bulk with a number of esters of benzylidenecyanoacetic acid. The kinetic scheme of all pairs fitted the improved scheme of copolymerization, taking into account the effect of the penultimate unit. The Alfrey‐PriceQandevalues were calculated. Using the modified Taft equation, log (1/r1) = ρ*σ*+ δEs, it was found that the relative reactivities of the ester monomers toward the polystyryl radical were correlated by the polar substituent constants σ*of the ester alkyl groups (ρ*= 0.14) and not by their steric substituent constantsEs(δ =