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(ɛ-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°C 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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The work was in part financially supported by the “863” Project of Minister of Science and Technology of China (No. 2007AA021905).
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Liu, Cc., Zhang, Ay., Ye, L. et al. Self-healing biodegradable poly(urea-urethane) elastomers based on hydrogen bonding interactions. Chin J Polym Sci 31, 251–262 (2013). https://doi.org/10.1007/s10118-013-1211-1
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DOI: https://doi.org/10.1007/s10118-013-1211-1