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Self‐Healing Shape Memory PUPCL Copolymer with High Cycle Life
Author(s) -
Ur Rehman Hafeez,
Chen Yujie,
Hedenqvist Mikael S.,
Li Hua,
Xue Wenchao,
Guo Yunlong,
Guo Yiping,
Duan Huanan,
Liu Hezhou
Publication year - 2018
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201704109
Subject(s) - materials science , copolymer , polyurethane , composite material , self healing , shape memory alloy , polycaprolactone , shape memory polymer , elongation , polymer , melting point , deformation (meteorology) , ultimate tensile strength , medicine , alternative medicine , pathology
New polyurethane‐based polycaprolactone copolymer networks, with shape recovery properties, are presented here. Once deformed at ambient temperature, they show 100% shape fixation until heated above the melting point, where they recover the initial shape within 22 s. In contrast to current shape memory materials, the new materials do not require deformation at elevated temperature. The stable polymer structure of polyurethane yields a copolymer network that has strength of 10 MPa with an elongation at break of 35%. The copolymer networks are self‐healing at a slightly elevated temperature (70 °C) without any external force, which is required for existing self‐healing materials. This allows for the new materials to have a long life of repeated healing cycles. The presented copolymers show features that are promising for applications as temperature sensors and activating elements.