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A Fast Room‐Temperature Self‐Healing Glassy Polyurethane
Author(s) -
Xu JianHua,
Chen JiaoYang,
Zhang YaNa,
Liu Tong,
Fu JiaJun
Publication year - 2021
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.202017303
Subject(s) - glass transition , materials science , polyurethane , self healing , ultimate tensile strength , polymer , hydrogen bond , composite material , relaxation (psychology) , modulus , chemical engineering , molecular dynamics , polymer chemistry , molecule , chemistry , organic chemistry , computational chemistry , medicine , psychology , social psychology , alternative medicine , pathology , engineering
We designed and synthesized a colorless transparent glassy polyurethane assembled using low‐molecular‐weight oligomers carrying a large number of loosely packed weak hydrogen bonds (H‐bonds), which has a glass transition temperature ( T g ) up to 36.8 °C and behaves unprecedentedly robust stiffness with a tensile Young's modulus of 1.56±0.03 GPa. Fast room‐temperature self‐healing was observed in this polymer network: the broken glassy polyurethane (GPU) specimen can recover to a tensile strength up 7.74±0.76 MPa after healing for as little as 10 min, which is prominent compared to reported room‐temperature self‐healing polymers. The high density of loose‐packed hydrogen bonds can reversibly dissociate/associate below T g of GPU (that is secondary relaxation), which enables the reconfiguration of the damaged network in the fractured interfaces, despite the extremely slow diffusion dynamics of molecular chains under room temperature. This GPU shows potential application as an optical lens.