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- Title
Self-Healing Polyurethanes with Shape Recovery.
- Authors
Heo, Yunseon; Sodano, Henry A.
- Abstract
Two new thermoresponsive self-healing polyurethanes (1DA1T and 1.5DA1T) based on the Diels-Alder (DA) reaction between furan and maleimide moieties are developed that use the shape-memory effect to bring crack faces into intimate contact such that healing can take place. Unlike other self-healing polymers, these polymers do not require external forces to close cracks but rather they use the shape-memory effect to autonomously close the crack. Both polyurethanes have a stable polymer structure and comparable mechanical properties to commercial epoxies. A differential scanning calorimeter is employed to check the glass transition temperature of the polymers as well as the DA and retro-DA (rDA) reaction temperatures. These DA and rDA reactions are confirmed with variable-temperature proton nuclear magnetic resonance. Healing efficiency is calculated using a measurement of the failure load from compact tension testing. The results show that the shape-memory effect can replace external forces to close two crack surfaces and the DA reaction can be repeatedly employed to heal the cracks.
- Subjects
POLYURETHANES; DIELS-Alder reaction; FURANS; POLYMER research; SHAPE memory effect
- Publication
Advanced Functional Materials, 2014, Vol 24, Issue 33, p5261
- ISSN
1616-301X
- Publication type
Article
- DOI
10.1002/adfm.201400299