重氮偶合方法合成主链型光响应偶氮聚合物  

SYNTHESIS OF A MAIN-CHAIN PHOTO-RESPONSIVE AZO POLYMER THROUGH AZO-COUPLING REACTION

作　　者：车鹏超[1] 和亚宁[1] 王晓工[1] 

机构地区：[1]清华大学化工系高分子研究所教育部先进材料重点实验室,北京100084

出　　处：《高分子学报》2006年第8期977-981,共5页Acta Polymerica Sinica

基　　金：国家自然科学基金(基金号50273018)资助项目

摘　　要：提出了一种利用重氮偶合方法合成主链偶氮聚合物的新方法,合成了一种主链含有假芪型偶氮生色团的聚合物.对合成聚合物的结构、热性能以及光响应性能进行了详细表征.在线偏振激光的作用下,聚合物膜中的偶氮苯生色团发生光致取向,用偏振紫外-可见光光谱测量了此聚合物膜的二向色性,得到聚合物膜的取向有序度为0.03.用波长为488 nm,能量密度为150 mW/cm2的相干Ar+激光对聚合物膜照射1000 s,得到形貌规整的正弦波形表面起伏光栅,光栅的周期为900 nm,起伏深度为89 nm.A novel polymer PAPE, containing electron donator-acceptor azobenzene chromophores in the main chain, has been synthesized by azo-coupling reaction. The azo polymer was characterized by 1H-NMR, UV-Vis spectrometry and thermal analysis. The it λmax of the polymer film and DMF solution was determined to be 445 nm and 446 nm, respectively. The number average molecular weight determined by GPC was Mn = 5600 with a polydispersion index 2.2. The glass transition temperature （ Ts ） of the polymer was 132℃ observed from DSC thermogram. The results showed the azo polymer can be successfully synthesized through azo-coupling reaction. The synthetic scheme demonstrated in this work is a feasible way to prepare main-chain azo polymers under an extremely mild condition. Dichroism was optically induced in the PAPE films under the irradiation of Ar^＋ laser beam at 488 nm, and the orientational order parameter obtained was 0.03. Surface-relief-gratings were observed on PAPE films after irradiated by an interference pattern of Ar^＋ laser beam for 1000 s. The surface modulation depth and the grating spacing were measured by AMF to be 89 nm and 900 nm.

关 键 词：重氮偶合 偶氮聚合物 光致二向色性 表面起伏光栅 

分 类 号：O633.2[理学—高分子化学]