偶氮苯聚合物(PGMAA-20)膜光栅结构的分子取向机制  

Molecular Reorientation Mechanism of Gratings Structure in an Azobenzene Polymer (PGMAA-20) Film

作　　者：牛永平[1] 张灵志[1] 苏育志[1] 梁兆熙[1] 陆伟[2] 佘卫龙[2] 

机构地区：[1]中山大学化学与化工学院高分子研究所,广东广州510275 [2]中山大学光电材料与技术国家重点实验室,广东广州510275

出　　处：《感光科学与光化学》2004年第3期183-189,共7页Photographic Science and Photochemistry

基　　金：广东省自然科学基金项目(001249;980346).

摘　　要：设计合成及表征了一种含偶氮苯聚合物(PGMAA 20)材料.利用两束S偏振光作为泵浦光在PGMAA 20膜上刻写光栅并观察光栅的衍射信号;然后再用相衬显微镜直接观察偶氮苯薄膜上的光栅结构,并以分子取向机制为基础对光栅形成和消除过程提出了新解释,这种观点被实验观察结果进一步证实.An azobenzene polymer (PGMAA-20) was synthesized and characterized.Photoinduced refractive index gratings were written in the azobenzene polymer films by using S+S configuration.After the gratings formed,the samples were investigated under a polarized optical phase contrast microscope.It has been found that the gratings are polarization sensitive.This kind of gratings can be kept in the material for a long time.A mode of molecular reorientation is used to explain the formation mechanism of these gratings and it is well consistent with our experimental results.

关 键 词：偶氮苯聚合物 光致异构 光栅结构 分子取向 

分 类 号：TQ571[化学工程—精细化工]