掺偶氮染料聚甲基丙烯酸甲酯的介电特性研究  

Dielectric Characteristic of Photoinduced Isomerization in Azo-Dye Doped Polymeric Matrices

作　　者：罗锻斌[1] 佘卫龙[2] 吴水珠[3] 

机构地区：[1]华东理工大学理学院物理系,上海200237 [2]中山大学光电材料与技术国家重点实验室,广东广州510275 [3]华南理工大学高分子材料科学与工程系,广东广州510640

出　　处：《中国激光》2005年第11期1534-1538,共5页Chinese Journal of Lasers

基　　金：广东省科技计划(A1060201);广州市科技计划(2002J1-C0111)资助项目

摘　　要：制备了具有不同偶氮生色团掺杂浓度的主客式聚甲基丙烯酸甲酯(PMMA)样品。利用介电测量的方法,观测了样品在532 nm光照射下的介电常数和介电损耗的变化。发现随着生色团浓度的增加,样品的介电常数增大;而生色团的掺入对于聚甲基丙烯酸甲酯样品的介电损耗则主要表现在对β弛豫的影响。浓度一定的生色团样品的介电常数随着激发光功率的增加而增大;样品的高频介电损耗随着激发光功率的增大而减小,但低频直流电导损耗则随着激发光功率的增加而增大。利用生色团在光致异构反应和取向运动过程中与聚甲基丙烯酸甲酯基体的相互作用,定性地解释了上述实验现象。The guest-host polymethyl methacrylate （PMMA） polymer samples with different doping concentration of azo-dye （DR13） were prepared. The dielectric constants and dielectric relaxation of the polymer samples were investigated under the irradiation of 532 nm light at first time. The dielectric constants increased with the concentration of azo-dye chromophores increasing, and the β dielectric relaxation was mainly influenced by the doping azo-dye chromophores. At a given azo-dye concentration, the dielectric constant increased with the pump power of 532 nm light increasing. With the increase of pump light power, the low frequency dielectric dissipation increased while the high frequency dielectric dissipation decreased. The results were explained based on the photoinduce isomerization of azo-dye chromophores and the interaction between the chromophores and polymer matrices.

关 键 词：材料 偶氮化合物 光致异构 介电测量 

分 类 号：O632.52[理学—高分子化学]