偶氮苯聚合物的光控图案化

Photo-Controllable Patterning of Azopolymer

将自组装得到的聚苯乙烯胶体晶体,利用反应离子刻蚀和软刻蚀法复形到偶氮苯聚合物膜表面,获得六方非紧密排列的偶氮苯聚合物半球状阵列微图案膜。采用场发射扫描电子显微镜(FESEM)、原子力显微镜(AFM)和接触角测量仪等对膜的微阵列结构和表面润湿性能进行了表征。研究了光照对膜微图案结构和润湿性能的影响。结果表明:基于偶氮苯基团的光致取向特性,偶氮苯聚合物膜的微图案在偏振光照射下,可由初始的半球状阵列微结构形变成纺锤状和椭球状等结构,这种微结构的改变可以改变膜表面润湿性,实现偶氮苯聚合物膜表面不同微图案和润湿性能的光照调控。

A non-close-packed hemispherical azobenzene homopolymer （refered as azopolymer） hexagonal array micropattern was obtained by using the self-assembly of polystyrene colloidal spheres,reactive ion etching and polydimethylsiloxane soft lithography.The structure and wettability of microarray surface was characterized by FESEM,AFM and contact angle meter.The influence of irradiation on micropattern structure and wettability of the film was studied.Under irradiation of a linearly polarized light,the micropattern of azopolymer film deformed from original hemisphere array to spindle-like array and ellipsoid-like array.It＇s a result of the photo-induced orientation from azobenzene moieties.The deformed microstructures change the surface wettability of the films,which realize the photo-control of different micropatterns and wettability on the surface of azopolymer films.