Preparation and Study on Photochromic Performance of Azobenzene Polyether Based on Backbone/Branched Chain Structure Designing
The introduction and orderly alignment of azobenzene moieties can bring the polymer rapid and reversible photoresponsive behavior.To improve the uniformity and controllability of azophenyl photochromic polymer materials,it is necessary to further design the topological structures of the main chain and functional branches.In this work,poly(allyl glycidyl ether)(PAGE)with unsaturated side groups was prepared by ring-opening polymerization of allyl glycidyl ether(AGE).The unsaturated side structures were hydroxylated via thiol-ene click chemistry,followed by a modification of photosensitive p-dicarboxylic azobenzene moieties.The influence of click chemical reaction conditions on the grafting ratio was investigated,and the design and optimization of the side chain structures had been carried out according to the relationship between the reaction conditions and grafting ratio.Ultimately,the azobenzene grafted polyether(PAGE-OH-Azo)with rapid conformational transition behavior under ultra violate had been obtained,which possesses good photo-responsiveness.Under continuous irradiation of ultraviolet and blue light,the PAGE-OH-Azo shows rapid reversible and cyclic-stable color change in liquid phase.By designing and optimizing the main chain and side group structures,polyethers with reliable and controllable color-changing properties were obtained,providing a practical basis on expanding the application of azobenzene modified polyether in the field of photoactive polymers.
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