Photo-induced Alignment Behavior of Azobenzene-containing Polymer Films with Different Cross-linking Degree  

作　　者：Jing Shena Jin-tang Huang Yan-hua Luoa Qi-jin Zhang Ke-yi Wang 

机构地区：[1]CAS Key Laboratory of Soft Matter Chemistry, Department of Polymer Science and Engineering, Key Laboratory of Optoelectronic Science and Technology, Anhui Province, University of Science and Technology of China, Hefei 230025, China [2]Department of Precision Machinery and Precision Instrumentation, University of Science and Tech- nology of China, Hefei 230025, China

出　　处：《Chinese Journal of Chemical Physics》2008年第5期493-499,共7页化学物理学报（英文）

基　　金：This work was supported by the National Natural Science Foundation of China （No.50573071, No.50533040, No.50703038, No.50773075, and No.50640420265）, the National Basic Research Program of China （No.2006cb302900）, and the Chinese Academy of Sciences （No.kjcx2.yw.H02）.

摘　　要：Three series of amorphous copolymers containing azobenzene groups with various substituents and certain amounts of crosslinkable acrylic groups were prepared. The cross-linked polymer films were obtained by thermal polymerization of the acrylic groups in the copolymers, during which, by controlling the time of cross-linking reaction, the films can be made with different cross-linking degree （from 0 to 32%, which was monitored by FT-IR spectra measurement）. Photo-induced alignment process of the films was performed under irradiation with linearly polarized light at 442 nm, and the effect of cross-linking degree on the photo-induced alignment rate was investigated. The dynamics of the photo-induced alignment was analyzed with biexponential curve fitting. The photo-induced alignment rate and the maximum transmittance of the films decreased because of the cross-linking. Furthermore, for the cross-linked samples, it was found that their saturated value of transmittances keep constant after repeated ＂writing＂ and ＂erasing＂ cycles. The findings reveal that the cross-linking of the film can effectively restrain the phototactic mass transport of azopolymer during irradiation by polarized light. The relationship between the cross-linking degree and the photo-induced alignment behavior of azopolymer is discussed in detail.

关 键 词：Azo polymer Cross-linking Photo-induced alignment Mass transport 

分 类 号：O625.65[理学—有机化学] TE357.46[理学—化学]