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合成了含有缩酮保护基团的共聚物聚N-十二烷基丙烯酰胺/1.4-二噁螺环[4,4]壬烷-2-亚甲基甲基丙烯酸酯pDDMA/DNMMA,并用Langmuir技术构建了单层和多层纳米超薄膜,用表面压(π)和静态弹性模量(Es)随平均重复单元面积(A)的变化研究了聚合物在气/液界面上的表面行为。研究结果表明,共聚物pDDMA/DNMMA能在水面上紧密排列,形成稳定的分子取向规整的Langmuir分子膜,其单层膜的厚度为1.6nm;分子的主链平躺在水面上,分子的侧链基团以与水面呈62°夹角向上伸展。与π-A曲线相比,Es-A曲线能更清楚直观地反映单分子层在挤压过程中微观结构的变化。Es-π曲线的研究为优化拉膜工艺条件提供了可靠依据。排列紧密的单分子膜在一定的表面压下,可单层、多层均匀的转移到固体基板上,形成规整有序层状结构的LB膜。
Poly-N-lauryl acrylamide / 1.4-dioxaspiro [4,4] nonane-2-methylene methacrylate pDDMA / DNMMA containing a ketal protecting group was synthesized and characterized by Langmuir The single-layer and multi-layer nano-thin films were fabricated by using the technique. The surface behavior of the polymer at the gas / liquid interface was investigated by the change of surface pressure (π) and static elastic modulus (Es) with the average repeating unit area (A) The results show that the copolymer pDDMA / DNMMA can be closely arranged on the water surface to form a stable molecular orientation regular Langmuir molecular film, the thickness of the monolayer film is 1.6nm; the main chain of the molecule lies on the water surface, the molecular side Chain groups with the water surface was 62 ° angle upward. Compared with the π-A curve, the Es-A curve can reflect the changes of the microstructure of the monolayer more clearly and clearly. The study of Es-π curve provides a reliable basis for optimizing the process conditions of drawing film. Arranged close to the monomolecular film in a certain surface pressure, monolayer, multi-layer uniform transfer to the solid substrate, forming a regular and orderly layered LB film structure.