偶氮苯超分子聚合物有序多孔膜的制备与定向光调控

Preparation and Directional Photomanipulation of Azobenzene Containing Supramolecular Polymer Ordered Porous Film

两亲性嵌段共聚物聚苯乙烯-b-聚(4-乙烯基吡啶)(PS-b-P4VP)中,吡啶的氮原子能够与4'-碘-4-二甲氨基偶氮苯(IAzo)的碘原子以卤键结合,从而构筑超分子聚合物.通过静态呼吸图法制备了含偶氮苯的PS-b-P4VP超分子聚合物PS-b-P4VP(IAzo)x蜂窝状有序多孔膜,并详细研究了IAzo的含量及光照条件对孔尺寸和形貌的影响.通过红外光谱、扫描电镜等表征手段对PS-b-P4VP(IAzo)x的制备及成膜的表面和断面形貌进行了研究.结果表明,随IAzo含量的增加,超分子聚合物多孔膜的孔径逐渐增大.此外,由于偶氮苯的光致形变特性,在线性偏振光照射下,多孔膜的圆孔可以转变为矩形孔或菱形孔.增加偶氮苯含量,能够加快形变速度.提出了简单新颖的光响应超分子聚合物制备方法,并成功地实现了孔结构的光调控,为可控表面图案的设计和应用提供了新的解决思路.

Supramolecular polymer can be formed from amphiphilic block copolymer polystyrene-b-poly（4-vinylpyridine）（PS-b-P4VP） and 4＇-iodo-4-dimethylaminoazobenzene molecule through halogen bond. In this paper, honeycomb ordered porous films were prepared by static breath figure（BF） method by this supramolecular polymer. The effects of IAzo content and light illumination conditions on the morphology of supramolecular polymer porous film were studied in detail. The formation of the supramolecular polymer, the surface and the fracture morphology of the porous film were characterized by infrared spectroscopy and scanning electron microscopy. These results showed that with the increase of IAzo content, the pore size of supramolecular polymer porous film gradually increased. In addition, under the irradiation of linearly polarized light, the round hole structure of the porous film can be converted into rectangular holes or rhombic holes according to the change of polarization direction of linearly polarized light. The degree of deformation increases with the increase of azobenzene content and the extension of illumination time. The porous film prepared from this azobenzene-containing supramolecular polymer realizes the light regulation of porous structure by non-synthetic means.