Self‐Healing Supramolecular Materials Constructed by Copolymerization via Molecular Recognition of Cavitand‐Based Coordination Capsules. Issue 38 (23rd July 2020)

• Record Type: Journal Article
• Authors: Nitta, Natsumi; Takatsuka, Mei; Kihara, Shin‐ichi; Hirao, Takehiro; Haino, Takeharu
• Is Part Of: Angewandte Chemie international edition. Volume 59:Issue 38(2020)
• Page Start: 16690
• Page End: 16697
• Publication Date: 2020-07-23
• Subjects: graft polymers -- molecular recognition -- self-healing -- supramolecular chemistry; Chemistry -- Periodicals; 540
• DOI: 10.1002/anie.202006604
• Languages: English
• ISSNs: 1433-7851

Abstract

Abstract: 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. Abstract : Welcome to the chain : A supramolecular graft polymer was fabricated via multiple guest recognition of a coordination capsule possessing eight polymer side chains. The supramolecular graft polymer was stable in bulk and gelled in organic solvents. It is elastic and shows self‐healing behavior.