聚乙烯醇缩甲酰苯基-乙烯基吡啶鎓盐的自组装膜及图案化

1991年发展起来的层层自组装(SA)是一种继Langmuir-Blodgett(LB)制膜技术之后的又一种以分子级控制的制备超薄膜的方法。虽然SA方法比LB膜技术晚了半个多世纪，但由于方法简单，不需专用设备；通常在水溶液中进行，对环境友好；对承受膜的物件形状和基材无严格限制等优点，十多年来一直受到关注，SA膜虽比LB膜稳定，但其层层间的离子键或氢键，仍不足以经受极性溶剂等的浸蚀，使其应用受到很大限制。

Self-assembed Film from Polyvinylacetal of Formyl-phenyl Ethenyl-pyridium and Its Patterning

Polyvinylacetal of 4-[2-(4-formylphenyl)ethenyl]pyridium(PVA-FEP) was synthesized and the layer by layer self-assembly from PVA-FEP as polycation with a series of polyanions was investigated. The multilayer utrathin films formed are photoreactive. Under UV irradiation the [2+2] cycloaddition of the styrylpiridium moieties of PVA-FEP takes place to produce crosslinking net works in the layers of the film. And the stability of the irradiated film toward polar solvents enhances greatly. The patterning of the film has been realized by selective UV exposure of the film through a photomask then developing in saturated sodium dodecyl sulfate aqueous solution.