光照可逆调控侧链液晶聚合物膜的表面能  

Light-induced reversible changes the surface energy of side-chain liquid crystalline polymer film

作　　者：李园园[1] 董明灵[1] 田晶晶[1] 刘剑[1] 

机构地区：[1]西南科技大学材料科学与工程学院,四川绵阳621010

出　　处：《功能材料》2012年第5期611-613,617,共4页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(20774076)

摘　　要：对侧链液晶聚合物聚甲基丙烯酸(5-[4-(4-氰基偶氮苯)苯氧基]戊酯)进行溶液铸膜,用473nm线偏振光(LPL)照射使聚合物膜发生光致取向,用锥光成像的方法表征了侧链液晶聚合物的取向。取向前接触角为71.8°,取向后为86.4°;用365nm紫外光照射后,薄膜发生了解取向,解取向后接触角为72.3°。取向使膜表面能由40.1变为30.8mJ/m2,解取向后又恢复到39.8mJ/m2。表明光照能可逆调控侧链液晶聚合物表面能。Light-induced orientation and disorientation of an azobenzene containing side-chain liquid crystalline polymer poly （5-[4-（4＇-cyano-azohenzene） phenoxy]pentyl methacrylate） were conducted on a solution-cast film. When exposed under a vertical linearly polarized light （LPL） at 473nm,in-plane orientations of the meso- gens were induced and were confirmed by the POM observations under conoseopic and orthoscopic illuminations. The contact angles of a drop of water on the different orientated films were measured of 71.8 and 86.4° on the non orientated and orientated film, respectively. The disorientated film was obtained by irradiated the ori- entated film upon exposed with a 365nm UV-light. The contact angle of a drop of water on the disoriented film is 72.3°. The surface energy of thin film was further calculated according to the measured contact angles,which reversibly varied between 40. 1 and 30.8mJ/m2.

关 键 词：偶氮苯 光照 可逆调控 表面能 侧链液晶聚合物 

分 类 号：TB34[一般工业技术—材料科学与工程] TB324