Advanced Functional Materials · 2017 · 120 citations · 31 references
Natural SciencesMaterials EngineeringMaterials SciencePolymer ChemistryPolymer EngineeringPolymer MaterialsPolymer NetworksPolymer Physical ChemistryPolymer PhysicsPolymer StabilitySelf-healing MaterialsThermoplastic PolymersElevated-temperature Material PropertiesMelting PointPolycaprolactonePolymer Network StructureSelf-healing Polymer MaterialsSelf-healing PolymersShape-memory Polymer NetworksShape-memory Polymers
Abstract 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.
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Poly(ε-caprolactone) Polyurethane and Its Shape-Memory Property
Peng Ping, Wenshou Wang, Xuesi Chen et al. · Biomacromolecules · 2005 · 350 citations
Natural Sciences, Materials Engineering, Materials Science +17