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Quantitative comparison of selectivities in the polymerization of cyclic esters
Authors:Jolanta Baran  Andrzej Duda  Adam Kowalski  Ryszard Szymanski  Stanislaw Penczek
Abstract:Chain transfer processes (ktr) taking place in the polymerization (anionic and pseudoanionic) of cyclic esters (lactones) are reviewed. These reactions are mostly responsible for the departure of these systems from the fully controlled (living) polymerizations. The ratios of kp/ktr have been determined for a number of initiating systems and the structures of the growing species are related to their selectivity, expressed by kp/ktr. It has been shown that the less reactive and more sterically crowded active species polymerize more selectively.
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