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.
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