Rubbing-Induced Molecular Reorientation on an Alignment Surface of an Aromatic Polyimide Containing Cyanobiphenyl Side Chains
作者:Jason J. Ge、Christopher Y. Li、Gi Xue、Ian K. Mann、Dong Zhang、Shyh-Yeu Wang、Frank W. Harris、Stephen Z. D. Cheng、Seok-Cheol Hong、Xiaowei Zhuang、Y. R. Shen
DOI:10.1021/ja0042682
日期:2001.6.1
This SLD technique probes the anisotropic surface orientation of the outermost molecules of the rubbed polyimide layer. The SERS results show that prior to rubbing the surface, both the pendent cyanobiphenyls in the side chains and backbones possess nearly planar chain conformations at the polyimide surface. Mechanical rubbing causes not only tilting of the backbone moieties, such as imide-phenylene structure
表面层状装饰 (SLD)、表面增强拉曼散射 (SERS) 和光学二次谐波产生 (SHG) 实验已被用于研究摩擦聚酰亚胺取向层表面的分子取向和构象变化。这种含有悬垂氰基联苯介晶的芳族聚酰亚胺是通过 2,2'-双(3,4-二羧基-苯基)六氟丙烷二酐 (6FDA) 与双[ω-[4-(4-氰基苯基)苯氧基]己基]的缩聚反应合成的4,4'-diamino-2,2'-biphenyldicarboxylate (nCBBP, n = 6),缩写为 6FDA--6CBBP。在室温下对聚酰亚胺薄膜表面进行机械摩擦并随后进行退火后,已经实现了均匀取向层,具有范围从 39 度到 43 度的高预倾角。这是第一次检测到高预倾角相对于摩擦方向(即与摩擦方向相反)具有负角(-theta(c)),与传统的预倾角(theta(c))显着不同。 c)) 沿摩擦方向观察。使用磁零和 SHG 方法证实了这一观察结果。结合聚乙烯