Backbone/Branched Chain Structure Tailoring and Photoinduced Deformability Controlling of Photodriven Polyethers
A post-functionalized photosensitive polyether material prepared by ring-opening polymerization(ROP),as well as side group modification that conducted by"click chemistry"is reported in this work.Allyl glycidyl ether(AGE)was used as the precursor to prepare poly(allyl glycidyl ether)(PAGE)by anionic ring-opening polymerization under the catalysis of cesium pivalate.Then the photosensitive moieties of cinnamoyl chloride were introduced onto side chains of PAGE prepolymer by two-step reactions of thiol-ene"click chemistry"and esterification,aiming to prepare polyether with photosensitive properties.The main chain length of PAGE prepolymer and the grafting rate of cinnamoyl chloride side groups can be flexibly controlled by adjusting the monomer/initiator ratio and grafting reaction time,respectively.After casted and photocured,the photosensitive PAGE film possesses a low glass transition temperature(Tg),and exhibits rapid and reversible deformation characteristic undergoing a reversible[2+2]cycloaddition reaction triggered by ultraviolet light with a wavelength of 365 and 254 nm.From the aspect of designing and optimizing the polyether main chain/side branches structure via ring-opening polymerization and"click chemistry"reaction design,the results provide practical ideas for broadening the service temperature window of photo-functional polyether,and improving its photo-induced deformation sensitivity.The obtained polyether materials also show some potential applications in the fields of controlled drug release and flexible intelligent robots.
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维普
