Light-driven actuators are widely used for smart devices such as soft robots.One of the main challenges for actuators is achieving rapid responsiveness,in addition to ensuring favorable mechanical properties.Herein,we...Light-driven actuators are widely used for smart devices such as soft robots.One of the main challenges for actuators is achieving rapid responsiveness,in addition to ensuring favorable mechanical properties.Herein,we focused on photoresponsive polyurethane(CD-Azo-PU)based on controlling the crystallization of the hard segments in polyurethane(PU)by complexation between azobenzene(Azo)and cyclodextrins(CDs).CD-Azo-PU incorporated polyurethane as the main chain and a 1:2 inclusion complex between Azo andγCD as a movable crosslink point.Upon ultraviolet light(UV,λ=365 nm)irradiation,the photoresponsiveness of CD-Azo-PU bent toward the light source(defined as positive),while that of the linear Azo polyurethane(Azo-LPU)without peracetylatedγ-cyclodextrin diol(TAcγCD-diOH)as a movable crosslinker bent in the direction opposite the light source.The bending rates were determined to be 0.25◦/s for CD-Azo-PU and 0.083◦/s for Azo-LPU,indicating that the bending rate for CD-Azo-PU was faster than that for Azo-LPU.By incorporating movable crosslinks into CD-Azo-PU,we successfully achieved specific photoresponsive actuation with an enhanced rate.展开更多
基金MEXT of Japan,Grant/Award Numbers:JP19H05714,JP19H05721Core Research for Evolutional Science and Technology(CREST),Grant/Award Number:JPMJCR22L4+4 种基金Establishment of university fellowships toward the creation of science technology innovation,Grant/Award Number:JPMJFS2125Iketani Science and Technology Foundation,Grant/Award Numbers:0341026-A,0351026-AAsahi Glass FoundationYazaki Memorial Foundation for ScienceCOI-NEXT program,Grant/Award Number:JPMJPF2218。
文摘Light-driven actuators are widely used for smart devices such as soft robots.One of the main challenges for actuators is achieving rapid responsiveness,in addition to ensuring favorable mechanical properties.Herein,we focused on photoresponsive polyurethane(CD-Azo-PU)based on controlling the crystallization of the hard segments in polyurethane(PU)by complexation between azobenzene(Azo)and cyclodextrins(CDs).CD-Azo-PU incorporated polyurethane as the main chain and a 1:2 inclusion complex between Azo andγCD as a movable crosslink point.Upon ultraviolet light(UV,λ=365 nm)irradiation,the photoresponsiveness of CD-Azo-PU bent toward the light source(defined as positive),while that of the linear Azo polyurethane(Azo-LPU)without peracetylatedγ-cyclodextrin diol(TAcγCD-diOH)as a movable crosslinker bent in the direction opposite the light source.The bending rates were determined to be 0.25◦/s for CD-Azo-PU and 0.083◦/s for Azo-LPU,indicating that the bending rate for CD-Azo-PU was faster than that for Azo-LPU.By incorporating movable crosslinks into CD-Azo-PU,we successfully achieved specific photoresponsive actuation with an enhanced rate.
