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

ISSN号：1674-0068
期刊名称：《化学物理学报》
时间：0
分类：O625.65[理学—有机化学;理学—化学] TE357.46[石油与天然气工程—油气田开发工程]
作者机构：[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
相关基金：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）.

作者： Jing Shena[1], Jin-tang Huang[2], Yan-hua Luoa[1], Qi-jin Zhang[1], Ke-yi Wang[2]

关键词：光致对齐行为, 偶氮苯, 聚合物, 化学分析, Azo polymer, Cross-linking, Photo-induced alignment, Mass transport

中文摘要：

与各种各样的取代者和交叉连接的某些数量包含偶氮苯组的非结晶的共聚物的三个系列有能力的丙烯酸的组被准备。cross-linked 聚合物电影被丙烯酸的组的热聚合在共聚物，由控制 cross-linking 反应的时间，这些电影能与不同 cross-linking 度在期间被做获得(从 0 ～ 32% ，它被英尺红外系列测量监视) 。这些电影的导致相片的排列过程在 442 nm 与线性地极化的光在照耀下面被执行，并且导致相片的排列率上的 cross-linking 度的效果被调查。导致相片的排列的动力学与双性人一起被分析指数的曲线试穿。因为 cross-linking，导致相片的排列率和这些电影的最大的发射度减少了。为 cross-linked 样品，在重复了“写”并且“擦掉”周期以后，而且，他们发射度的浸透的价值保持不变，这被发现。调查结果表明电影罐头的 cross-linking 有效地由极化的光在照耀期间制止偶氮的聚合物的趋光性的集体运输。在 cross-linking 度和偶氮的聚合物的导致相片的排列行为之间的关系详细被讨论。

英文摘要：

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.