Rapid Near-Infrared Light Responsive Shape Memory Polymer Hybrids And Novel Chiral Actuators Based On Photothermal W18o49 Nanowires
ADVANCED FUNCTIONAL MATERIALS(2019)
摘要
Photoresponsive actuators are built by introducing oligo(ethylene glycol) (OEG)-modified W18O49 nanowires into cross-linked polyethylene glycol diacrylate (cPEGDA) polymer matrices. Due to the good compatibility, OEG-W18O49 NWs disperse well and increase the crystallinity of cPEGDA matrices even in high loading concentrations (4.0 wt%). The cPEGDA/W18O49 nanocomposites show efficient photothermal transition and rapid shape memory behaviors. They can raise the local temperature to 160 degrees C in only 8.5 s and recover the initial shape within 10 s. Making use of the broad and strong absorption property of W18O49, the cPEGDA/W18O49 NW actuators respond to both ultraviolet and near-infrared light and make contraction and bending motions. Furthermore, by utilizing oriented chain segments of the crystalline polymer and vector sum of shape recovery forces, the cPEGDA/W18O49 NW hybrid actuators exhibit stable helical deformation (right-handed and left-handed).
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关键词
hybrids, photoresponsive actuators, shape memory polymers, W18O49 nanowires
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