Premium
Efficient Synthesis of Cyclic Block Copolymers by Rotaxane Protocol by Linear/Cyclic Topology Transformation
Author(s) -
Valentina Stephanie,
Ogawa Takahiro,
Nakazono Kazuko,
Aoki Daisuke,
Takata Toshikazu
Publication year - 2016
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201601266
Subject(s) - rotaxane , copolymer , topology (electrical circuits) , materials science , polymer , crown ether , polymer chemistry , crystallinity , ether , block (permutation group theory) , ring opening polymerization , crystallography , chemistry , supramolecular chemistry , composite material , organic chemistry , crystal structure , mathematics , geometry , ion , combinatorics
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.