Unprecedented Sequence Control and Sequence‐Driven Properties in a Series of AB‐Alternating Copolymers Consisting Solely of Acrylamide Units. Issue 13 (11th February 2020)

• Record Type: Journal Article
• Authors: Kametani, Yuki; Tournilhac, François; Sawamoto, Mitsuo; Ouchi, Makoto
• Is Part Of: Angewandte Chemie international edition. Volume 59:Issue 13(2020)
• Page Start: 5193
• Page End: 5201
• Publication Date: 2020-02-11
• Subjects: alternating copolymers -- copolymerization -- cyclopolymerization -- polyacrylamides -- radical polymerization; Chemistry -- Periodicals; 540
• DOI: 10.1002/anie.201915075
• Languages: English
• ISSNs: 1433-7851

Abstract

Abstract: Herein, we report a method to synthesize a series of alternating copolymers that consist exclusively of acrylamide units. Crucial to realizing this polymer synthesis is the design of a divinyl monomer that contains acrylate and acrylamide moieties connected by two activated ester bonds. This design, which is based on the reactivity ratio of the embedded vinyl groups, allows a "selective" cyclopolymerization, wherein the intramolecular and intermolecular propagation are repeated alternately under dilute conditions. The addition of an amine to the resulting cyclopolymers afforded two different acryl amide units, i.e., an amine‐substituted acryl amide and a 2‐hydroxy‐ethyl‐substituted acryl amide in alternating sequence. Using this method, we could furnish ten types of alternating copolymers; some of these exhibit unique properties in solution and in the bulk, which are different from those of the corresponding random copolymers, and we attributed the differences to the alternating sequence. Abstract : Alternating copolymers that consist exclusively of acrylamide units have been produced. Crucial to realizing this unprecedented polymer synthesis is the design of a divinyl monomer carrying two activated ester bonds to allow "selective" cyclopolymerization and aminolysis. Some of the alternating copolyacrylamides exhibit unique properties compared to the random copolymers in solution and in the bulk state.