Abstract
AbstractIn order to improve the hydrophilic and elastic properties of polyester networks, the amorphous polymer networks of hydrophobic polyester/hydrophilic poly(ethylene glycol) dimethacrylate (PEGDMA) were prepared by UV‐photopolymerization of PEGDMA and poly[(D,L‐lactide)‐co‐glycolide]tetraacrylate (PLGATA). The interpenetrating polymer networks (IPNs) based on polyesterurethane and PEGDMA were synthesized in situ by UV‐photopolymerization of PEGDMA and thermal polymerization of oligo[(D,L‐lactide)‐co‐ε‐caprolactone]teraol (PCLA) or poly[(D,L‐lactide)‐co‐glycolide]teraol (PLGA) with isophorone diisocyanate (IPDI). The polymer networks and IPNs are transparent soft materials, and show good shape‐memory properties. They recovered their permanent shape in 12 seconds when the environment temperature was above glass transition temperature (Tg). The strain recovery rate (Rr) and the strain fixity rate (Rf) of the polymer networks and IPNs were above 90%. The wettability, degradation rate, mechanical properties, and Tg of the polymer networks and IPNs could be conveniently adjusted by changing PEGDMA content. The elastic networks are suitable for potential soft substrates with tailored mechanical properties for clinical or medical use.
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