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Self‐Healing Supramolecular Materials Constructed by Copolymerization via Molecular Recognition of Cavitand‐Based Coordination Capsules
Author(s) -
Nitta Natsumi,
Takatsuka Mei,
Kihara Shinichi,
Hirao Takehiro,
Haino Takeharu
Publication year - 2020
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.202006604
Subject(s) - supramolecular chemistry , copolymer , polymer chemistry , polymer , supramolecular polymers , hydrodynamic radius , materials science , chemistry , crystallography , crystal structure , composite material
The repeating guest units of poly‐(R)‐ 2 were selectively encapsulated by the self‐assembled capsule poly‐ 1 possessing eight polymer side chains to form the supramolecular graft polymer (poly‐ 1 ) n ⋅poly‐(R)‐ 2 . The encapsulation of the guest units was confirmed by 1 H NMR spectroscopy and the DOSY technique. The hydrodynamic radius of the graft polymer structure was greatly increased upon the complexation of poly‐ 1 . The supramolecular graft polymer (poly‐ 1 ) n ⋅poly‐(R)‐ 2 was stably formed in the 1:1 host–guest ratio, which increased the glass transition temperature by more than 10 °C compared to that of poly‐ 1 . AFM visualized that (poly‐ 1 ) n ⋅poly‐(R)‐ 2 formed the networked structure on mica. The (poly‐ 1 ) n ⋅poly‐(R)‐ 2 gelled in 1,1,2,2‐tetrachloroethane, which led to fabrication of distinct viscoelastic materials that demonstrated self‐healing behavior in a tensile test.