Key Words:SILICONE ELASTOMER
Abstract:It is a desirable to prepare high performance polyester elastomers that possess high strength, good elasticity and efficient self-healing capability. Herein, we report the preparation of such elastomers based on aliphatic poly-esters cross-linked by UPy-UPy quadruple hydrogen bonding. A functional monomer alpha-methylene-gamma-butyr-olactone (MBL) was copolymerized with epsilon-caprolactone (epsilon-CL) to give pendent double bonds functionalized copolyester precursors, which were subject to post-modification with UPy groups via the efficient thiol-ene click reaction. Then, the self-healing polyester elastomers were finally obtained by tuning the molecular weight of precursors, the contents of UPy units and crystallization behaviors. The results show that high polyester mo-lecular weight, moderate UPy content and inhibition of crystallization are helpful to improve the mechanical and self-healing properties of elastomers. The obtained elastomers show good mechanical strength (1.0-1.5 MPa), excellent elongation at break (970-1560 %) and toughness (9.6-11.9 MJ/m3), and have the rapid self-healing property (>70 % after healing at 60 degrees C for 2 h), displaying great potential in biomedical applications.
Volume:184
Issue:
Translation or Not:no