Construction Of Reversible Light-controlled Ordered Structure Based On Azobenzene Compounds And Its Optical Properties

Azobenzene compounds have excellent photochromic properties and can realize the mutual transformation of trans and cis structures under different conditions,so they are widely used in the fields of optical storage and optical response.The ordered structure based on azobenzene compounds can change the optical properties through the reversible transformation of azobenzene configuration.This thesis mainly carried out the synthesis and optical properties of azobenzene compounds with different functional groups,the preparation of silica-photonic crystals(PC-Azo)grafted with azobenzene compounds and their photoresponsive properties and the grafted azobenzene Preparation of the compound’s temperature-sensitive polymer(PNIPAM-Azo)photothermal dual response material and its solution self-assembly behavior.The main contents are as follows:1.Three azobenzene compounds with different structures were synthesized and their structures were characterized.The effects of the polarity of the solvent and H+ in the solution on the optical properties of the azobenzene compound were studied.The photo-isomerization and thermal-isomerization behaviors of the synthesized azobenzene compounds were studied,and the results showed good optical reversibility.2.Due to the existence of photonic band gap(PBG),photonic crystals(PCs)as a periodic medium structure have control over the transmission of light.PCs prepared by silica microspheres grafted with azobenzene compounds can be adjusted for PBG by changing the configuration of azobenzene under ultraviolet and visible light irradiation.Silica microspheres with different particle sizes were prepared,and the effects of different reaction conditions on particle size were investigated.Nano-SiO2 microspheres grafted with azobenzene compounds were synthesized and prepared into photo-responsive photonic crystal PC-Azo.It was found that its PBG photoresistance would be red-shifted by 16 nm.The silica photonic crystal was filled with PNIPAM hydrogel to prepare a thermally responsive photonic crystal PC-PNIPAM,whose PBG has a reversible response to temperature of 12 nm.3.Poly-N-isopropylacrylamide(PNIPAM)is a widely studied temperature-sensitive polymer.By grafting azobenzene compounds,a photothermal dual-responsive amphiphilic material can be prepared and can be self-assembled in solution.Using the trithioester with azophenyl groups(DDMAT-Azo)as the chain transfer agent,the photothermal dual-response material PNIPAM-Azo was synthesized by the reversible addition fragmentation transfer method,and its self-assembly adhesive in aqueous solution was studied beaming behavior.Based on its good solubility in aqueous solution,a photothermal response PNIPAM hydrogel was prepared,and its photothermal response performance was studied.