Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 28, Issue 7, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201704109
Keywords
Self-healing; shape memory; shape recovery; shape fixity; polyurethane and poly(caprolactone)
Categories
Funding
- Fundings for Natural Science Foundation of China (NSFC) [51373096, U1733130, 11704244]
- Shanghai Sailing Plan Project from Shanghai Scientific and Technical Personnel Committee [16YF1406100]
- Shanghai Natural Science Funding from Shanghai Scientific and Technical Personnel Committee [17ZR1441000]
- Basic Research Field of Shanghai Science and Technology Innovation Program [16JC1401500]
- Shanghai Production-Study-Research Cooperative Project [15521107600]
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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 degrees 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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