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Valentina S, Ogawa T, Nakazono K, et al. Efficient Synthesis of Cyclic Block Copolymers by Rotaxane Protocol by Linear/Cyclic Topology Transformation. Chemistry. 2016;22(26):8759-62doi: 10.1002/chem.201601266.
Valentina, S., Ogawa, T., Nakazono, K., Aoki, D., & Takata, T. (2016). Efficient Synthesis of Cyclic Block Copolymers by Rotaxane Protocol by Linear/Cyclic Topology Transformation. Chemistry (Weinheim an der Bergstrasse, Germany), 22(26), 8759-62. https://doi.org/10.1002/chem.201601266
Valentina, Stephanie, et al. "Efficient Synthesis of Cyclic Block Copolymers by Rotaxane Protocol by Linear/Cyclic Topology Transformation." Chemistry (Weinheim an der Bergstrasse, Germany) vol. 22,26 (2016): 8759-62. doi: https://doi.org/10.1002/chem.201601266
Valentina S, Ogawa T, Nakazono K, Aoki D, Takata T. Efficient Synthesis of Cyclic Block Copolymers by Rotaxane Protocol by Linear/Cyclic Topology Transformation. Chemistry. 2016 Jun 20;22(26):8759-62. doi: 10.1002/chem.201601266. Epub 2016 May 12. PMID: 27037975.
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Chemistry. 2016 Jun 20;22(26):8759-62. doi: 10.1002/chem.201601266. Epub 2016 May 12.

Efficient Synthesis of Cyclic Block Copolymers by Rotaxane Protocol by Linear/Cyclic Topology Transformation.

Chemistry (Weinheim an der Bergstrasse, Germany)

Stephanie Valentina, Takahiro Ogawa, Kazuko Nakazono, Daisuke Aoki, Toshikazu Takata

Affiliations

  1. Department of Organic and Polymeric Materials, Tokyo Institute of Technology, 2-12-1 O-okayama, Meguro-ku, Tokyo, 152-8552, Japan.
  2. Department of Organic and Polymeric Materials, Tokyo Institute of Technology, 2-12-1 O-okayama, Meguro-ku, Tokyo, 152-8552, Japan. [email protected].

PMID: 27037975 DOI: 10.1002/chem.201601266

Abstract

High-yielding synthesis of cyclic block copolymer (CBC) using the rotaxane protocol by linear-cyclic polymer topology transformation was first demonstrated. Initial complexation of OH-terminated sec-ammonium salt and a crown ether was followed by the successive living ring-opening polymerizations of two lactones to a linear block copolymer having a rotaxane structure by the final capping of the propagation end. CBC was obtained in a high yield by an exploitation of the mechanical linkage through the translational movement of the rotaxane component to transform polymer structure from linear to cyclic. Furthermore, the change of the polymer topology was translated into a macroscopic change in crystallinity of the block copolymer.

© 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Keywords: polymers; ring-opening polymerization; rotaxanes; structural transformation; topology

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