Abstract
The polymers exhibit excellent color and are purer than those formed in the free radical polymerization process. The use of α-methylstyrene comonomer increases heat resistance. Some anionic polymerizations are also described as living polymers in the absence of impurities. Electron-withdrawing substituents adjacent to an olefinic bond tend to stabilize carbanion formation and thus activate the compound toward anionic polymerization. The relative initiator activities are not always simple functions of the reactivity of the free anion but involve contributions by complexing ability, ionization, or dissociation reactions. The anionic polymerization of styrene using the organolithium initiator scan is described as termination-free polymerization. The degree of polymerization is determined by the ratio of the overall rate of propagation to that of initiation.
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