Anionic polymerization of α,α-disubstituted β-propiolactones with cryptates as counterions |
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| Authors: | Johnny Haggiage Patrick Hémery Sylvie Boileau Robert W Lenz |
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| Affiliation: | Laboratoire de Chimie Macromoléculaire associé au CNRS, Collège de France, 11 place Marcelin Berthelot, 75231 Paris Cédex 05, France;Materials Research Laboratory, Chemical Engineering Department, University of Massachusetts, Amherst, MA 01003, USA |
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| Abstract: | A kinetic study of the anionic polymerization of α-methyl-α-propyl-β-propiolactone has been made in tetrahydrofuran at ?20°C, with the cryptate K++222] as counter-ion. Conductance measurements have been made on THF solutions of potassium β-naphthoate complexed by 222] as a model of cryptated carboxylates. Propagation reaction proceeds through cryptated ion pairs and free ions. Cryptated carboxylate ion pairs are more reactive than free ions. |
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| Keywords: | α-Methyl-α-propyl-β-propiolactone anionic polymerization cryptates kinetics conductivity |
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