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Scope and limitations of the nitroxide-mediated radical ring-opening polymerization of cyclic ketene acetals

Abstract : The ring-opening polymerization of cyclic ketene acetals (CKAs) by controlled radical mechanisms represents an alternative route for the synthesis of aliphatic polyesters. For the first time, 5,6-benzo-2-methylene-1,3-dioxepane (BMDO) and 2-methylene-4-phenyl-1,3-dioxolane (MPDL) were homopolymerized by nitroxide mediated polymerization (NMP), from the commercially available SG1-based BlocBuilder MA alkoxyamine. Various experimental conditions (i.e., reaction temperature, nature of solvent, and nature of the alkyl initiating radical) were varied to determine the optimized conditions in terms of polymerization kinetics and living character of the final polymer. Chain-end extensions from either PS-SG1 or PBMDO-SG1 were also performed in order to furnish PS-b-PBMDO and PBMDO-b-PS, respectively, thus demonstrating the synthesis of block copolymers comprising a CKA block. In order to have a better insight into the polymerization mechanism, the occurrence of side reactions was analyzed by P-31 NMR spectroscopy and ESI-MS. It was supposed that the ketal-based macroradical could be irreversibly trapped by nitroxide and thus the corresponding macroalkoxyamine decomposed by CO-N bond dissociation. DFT calculations as well as PREDICI modeling were also undertaken in order to support this hypothesis.
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https://hal-amu.archives-ouvertes.fr/hal-01415181
Contributor : Didier Siri <>
Submitted on : Monday, December 12, 2016 - 6:49:49 PM
Last modification on : Wednesday, October 14, 2020 - 3:46:42 AM

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Antoine Tardy, Vianney Delplace, Didier Siri, Catherine Lefay, Simon Harrisson, et al.. Scope and limitations of the nitroxide-mediated radical ring-opening polymerization of cyclic ketene acetals. Polymer Chemistry, Royal Society of Chemistry - RSC, 2013, 4 (17), pp.4776--4787. ⟨10.1039/c3py00719g⟩. ⟨hal-01415181⟩

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