Ohkita Masaki, Higuchi Masahiro, Kawaguchi Masami
Department of Chemistry for Materials, Faculty of Engineering, Mie University, Tsu, Mie 514-8507, Japan.
J Colloid Interface Sci. 2005 Dec 1;292(1):300-3. doi: 10.1016/j.jcis.2005.05.035. Epub 2005 Jul 12.
LB films of rigid-rod-like poly(n-hexyl isocyanate) (PHIC), flexible poly(vinyl acetate) (PVAc), and binary mixtures of PHIC as well as of PHIC and PVAc transferred on a mica surface from the air-water interface were observed by AFM. The grain structure of three individual PHIC samples in the AFM images changed shape from a rigid rod to a coiled rod with an increase in the molecular weight due to changes in the chain rigidity of PHIC. On the other hand, the AFM image of PVAc was similar to that of a mica surface, indicating that PVAc forms a uniform and homogeneous film. For the binary mixtures of PHIC, the grain structure in the AFM image of the highest molecular weight PHIC was expanded with a similar shape after the addition of the smallest one, whereas it lost its shape after the addition of the middle one. Their peak-to-valley values in the AMF images were similar to those of the individual PHIC samples. For the binary mixtures of PHIC with the highest mass and PVAc, the grain in the AFM image of the PHIC lost its shape after the addition of PVAc and it changed shape from a connected partial lost coil to an extended bundle rod with an increase in the PVAc component.
通过原子力显微镜（AFM）观察了从空气 - 水界面转移到云母表面的刚性棒状聚（正己基异氰酸酯）（PHIC）、柔性聚（醋酸乙烯酯）（PVAc）以及PHIC的二元混合物和PHIC与PVAc混合物的LB膜。由于PHIC链刚性的变化，随着分子量的增加，AFM图像中三个单独的PHIC样品的晶粒结构从刚性棒状变为盘绕棒状。另一方面，PVAc的AFM图像与云母表面的图像相似，这表明PVAc形成了均匀且同质的膜。对于PHIC的二元混合物，在加入分子量最小的PHIC后，分子量最高的PHIC的AFM图像中的晶粒结构以相似的形状扩展，而在加入分子量中等的PHIC后，其形状消失。它们在AFM图像中的峰谷值与单独的PHIC样品相似。对于质量最大的PHIC与PVAc的二元混合物，加入PVAc后，PHIC的AFM图像中的晶粒失去其形状，并且随着PVAc组分的增加，其形状从连接的部分失稳线圈变为延伸的束状棒。
