Self-healing biodegradable poly(urea-urethane) elastomers based on hydrogen bonding interactions |
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Authors: | Cong-cong Liu Ai-ying Zhang Lin Ye Zeng-guo Feng |
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Affiliation: | School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China |
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Abstract: | Self-healing poly(urea-urethane)s (PUUs) showing a tolerance to mechanical damage are particularly desirable for high-performance elastomeric biomaterials. In this study a kind of biodegradable PUUs was synthesized from poly(ε-caprolactone) diol with L-lysine ethyl ester diisocyanate (LDI) extended with L-lysine ethyl ester dihydrochloride (LEED) in DMF and characterized by using 1H-NMR, FTIR, DSC, XRD, SEM and tensile tests. Interestingly, they exhibited a self-healing characteristic upon exposure to 37℃ for as short as 30 min with the tensile strength keeping at 4.23 MPa and the elongation at break reaching to 627%. It is revealed that increasing the hard segment content in PUUs benefits the self-healing performance, and on the opposite increasing the soft segment content contributes to the biodegradability. |
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Keywords: | L-lysine ethyl ester diisocyanate ε-caprolactone) diol')" href=" #" >Poly(ε-caprolactone) diol Poly(urea-urethane) Self-healing Biodegradable |
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