Design, Synthesis And Characterization Of New Azobenenze Photosensitive Polymer

Two series of photosensitive mutifunctional monomers containing azobenzene moieties have been synthesized by molecular design, after which azobenene-corsslinked polymers were obtained by suitable reaction with the monomers above.We synthesized 4,4’-dihydroxy-azobenzene (ABP) and 4,4’-di-(n-hydroxy)-n-alkoxy-azobenzene (ABDHn) which have two hydroxy as azo basic unit.The structure and photoisomerization of the monomers were characterized by infrared spectroscopy(IR), nuclear magnetic resonance spectroscopy(1HNMR), differential scanning calorimetry (DSC) and UV-visible spectrum(UV-Vis).The second part of the works focus on the thermal performance and the photosensitivity of acrylic azobenzene-corsslinked polymers. First we composed diacrylic azobenzene corsslinking monomers,4,4’-bis-acrylate-yl-azobenzene(ABME), 4,4’-bis-[(acrylic-n-ester-yl)-n-alkoxy]azobenzene(ABDMEn). Structures and properties of monomers were characterized by IR,1HNMR, DSC and UV-Vis. Then we systhesized a series of azobenene polymers by crosslinking monoacrylate and the diacrylic azobenzene corsslinking monomers. IR was used to prove the structure of these polymers. DSC showed that all these polymers was amorphous type and their Ts values were considered about the azo moieties. Crosslinking with the same monomer, Tg values increased by the rising of the concentrantion of azobenzene; crosslinking with the same concentration of the azobenzene monomers, Tg increased with the reduction of the flexible segment length. UV-Vis studied the photosensitive and isomerization kinetics. The higher azo moieties concentration the copolymers have, the higher is the photoresponsen rate. Isomerization could be initiated by both light and heating.In the third parts, we obtained the 4,4’-the diglycidyl ether azobenzene (ABDE) by epoxidation,4,4’-bis-{[N1,N2-bis(tert-butyl-oxycarbonyl)-L-lysine-ester-yl]-n-alkoxy} azobenzene(Boc-ABDLn) by esterification,4,4’-bis-[(L-lysine-ester-yl)-n-alkoxy] azobenzenen(NH2-ABDn) by removing the protective group[N1,N2-bis-(tert-butyl-oxycarbonyl)]. Boc-ABDLn and NH2-ABDn were not seen before in reports. Experiments were carried out to customize a good reaction process. Structures and properties of all the monomers were characterized by IR,1NMR, DSC and UV-Vis. For the reactive groups which ABDE and NH2-ABDn have, we attempted to conduct a curing reaction of the two monomers in molar ratio of 4:1 by using DSC method in 10℃/min heating rate. And the DSC and the ER results showed the reaction achieved the desired result.