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Photo-induced Alignment Behavior of Azobenzene-containing Polymer Films with Different Cross-linking Degree
Jing Shen a,Jin-tang Huang b,Yan-hua Luo a,Qi-jin Zhang a*,Ke-yi Wang b
Author NameAffiliationE-mail
Jing Shen a 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 230026, China  
Jin-tang Huang b 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 230026, China  
Yan-hua Luo a 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 230026, China  
Qi-jin Zhang a* 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 230026, China zqjm@ustc.edu.cn 
Ke-yi Wang b 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 230026, China  
Abstract:
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.
Key words:  Azo polymer, Cross-linking, Photo-induced alignment, Mass transport
FundProject:
Photo-induced Alignment Behavior of Azobenzene-containing Polymer Films with Different Cross-linking Degree
申婧 a,黄金堂 b,罗艳华 a,张其锦 a*,王克逸 b
摘要:
合成了带有不同取代基的偶氮苯基团和可交联丙烯酸基团的共聚物,并通过控制热聚合的反应条件获得一系列不同交联密度的聚合物薄膜. 红外光谱表征样品交联度是从0到32%. 不同交联密度的偶氮聚合物薄膜的光致取向行为的研究结果表明交联能够降低光致取向速率以及薄膜的最大透过率. 进一步的重复擦写实验还表明交联薄膜能够有效抑制在线偏光擦写过程中偶氮苯分子的趋光性质量迁移.
关键词:  偶氮聚合物,交联,光致取向,质量迁移
DOI:10.1088/1674-0068/21/05/493-499
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