摘要
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。
A novel series of ketal - protected copotymer, poly （ N - dodecylmethacrylamide - co - 1,4 - dioxaspiro [ 4.4 ] nonane - 2 - methyl methaerylate） p （ DDMA - DNMMA）, were synthesized, and their monolayer and muhilayer nanosheets were deposited by Langmuir - Blodgett （LB） technique. The surface behavior of the copolymer monolayer at the air/water interface was investigated by measuring the surface pressure （π） and the static elasticity （Es） as a function of mean repeat area （A） isotherm. The results showed that p （DDMA -DNMMA） could form the stable, well - defined molecular orientation Langmuir monolayer on the water surface, which was further proved by the measurements of the atomic force microscopy （AFM）. The polymer main chain lies flat on a water surface and the side chains attached to the main chain stretch out at the angle of about 62°. Condensed monolayer were transferred onto solid substrates at a given surface pressure, forming regular homogeneous Y - type LB films. UV - visible absorption spectra indicated that the well - ordered layer - by - layer structure was successfully controlled in the LB films.
出处
《中州大学学报》
2009年第2期103-107,共5页
Journal of Zhongzhou University
基金
河南省自然科学基金(0611020100)
河南省杰出人才创新基金(074100510015)
