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 synthesize...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（e-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.展开更多
基金financially supported by the "863" Project of Minister of Science and Technology of China(No. 2007AA021905)
文摘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（e-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.
