Supramolecular photoresponsive polyurethane with movable crosslinks based on photoisomerization of azobenzene  

作　　者：Xin Zhou Ryohei Ikura Changming Jin Kenji Yamaoka Junsu Park Yoshinori Takashima 

机构地区：[1]Department of Macromolecular Science,Graduate School of Science,Osaka University,Toyonaka,Japan [2]Forefront Research Center,Graduate School of Science,Osaka University,Toyonaka,Japan [3]Innovative Catalysis Science Division,Institute for Open and Transdisciplinary Research Initiatives(OTRI),Osaka University,Suita,Japan

出　　处：《Aggregate》2024年第2期336-344,共9页聚集体（英文）

基　　金：MEXT of Japan,Grant/Award Numbers:JP19H05714,JP19H05721;Core Research for Evolutional Science and Technology(CREST),Grant/Award Number:JPMJCR22L4;Establishment of university fellowships toward the creation of science technology innovation,Grant/Award Number:JPMJFS2125;Iketani Science and Technology Foundation,Grant/Award Numbers:0341026-A,0351026-A;Asahi Glass Foundation;Yazaki Memorial Foundation for Science;COI-NEXT program,Grant/Award Number:JPMJPF2218。

摘　　要：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.

关 键 词：hydrogen bonding movable crosslink PHOTORESPONSIVE POLYURETHANE supramolecular materials UV irradiation 

分 类 号：O63[理学—高分子化学]