Thermoresponsive polyurethane (PU)–silica nanocomposites were synthesized by incorporating silica particles as multifunctional cross-linkers into the PUvia sol–gel reactions. At 2 wt% silica, the composites showed over 99% shape fixity and shape recovery up to the 4th thermomechanical cycle along with outstanding mechanical properties in their rubbery as well as glass state. The incorporated nano-sized silica particles gave dual effects of multifunctional chemical cross-links and reinforcing fillers. The properties were favorably compared with those of uncross-linked PU and conventionally cross-linked PU.
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Jang et al. (2009) studied this question.
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