Direct Observation of Polymer Chain Packings in Polymer Monolayers

聚甲基丙烯酸甲酯(PMMA)/聚丙烯酸正丁酯共混单分子膜是一种互溶体系，如果少量的PMMA链被溶解在PNA单分子膜中，则首次用原子力显微镜成功地显示了PNA单分子膜中孤立的PMMA链。PMMA链在PNA单分子膜中的增溶回转半径与PMMA分子量成0.63次方关系，但在很大范围内与基质PNA分子量无关。这些结果表明，PNA/PMMA单分子膜是一个强相容体系，尽管PNA/PMMA分子量的标度系数(0.63)略小于二维良溶剂体系的标度值(0.75)。

Poly(methyl methacrylate)(PMMA)/poly(n-nonyl acrylate) blend monolayer was a miscible system, and if a small amount of PMMA chains was solubilized in a PNA monolayer, the isolated PMMA chains in the PNA monolayer were, for the first time, successfully visualized by atomic force microscopy. The radius of gyration of the PMMA chain solubilized in the PNA monolayer scaled with the PMMA molecular weight in a power of 0.63, but was independent on the molecular weight of the matrix PNA over a wide range. These results indicate that the PNA/PMMA monolayer is a strongly miscible system, although the scaling, 0.63 with the PMMA molecular weight is slightly smaller than the value for two-dimensional good solvent system (0.75).