Molecular Orientation and Photophysical Characteristics of Mono- and Multilayer Polymer Films

本文采用Langmuir-Blodgett方法制备了超薄聚合物薄膜，通过单层两亲性聚合物的沉积在分子尺度上控制各层的厚度和空间顺序。采用荧光探针技术对聚合物LB膜的结构进行了研究。用荧光探针对部分聚合物进行了标记，荧光光谱法检测了以下几点：聚合物链的分子取向，2。2 .客体分子在二维平面上的分布；层状结构的质量；层状结构的热稳定性。此外，超分子结构被用作激发能转移和光致电子转移过程等光函数场。揭示了聚合物LB膜的光物理特性。结果表明，作为LB材料，非晶聚合物具有化学结构多样、针孔少、单层薄、功能单元易于引入、客体部分分布均匀等优点。这表明聚合物LB膜是一种很有前途的实现人工分子组装的新材料。

In this work, ultrathin polymer films were prepared by the Langmuir-Blodgett method, in which the thickness and spatial order of each layer were controlled in molecular dimension by the deposition of monolayer of amphiphilic polymers. Fluorescence method was applied as a probing technique for the structural studies on the polymer LB films. Some polymers were labeled with fluorescent probes and the following points were examined by fluorescence spectroscopy :1. Molecular orientation of polymer chains,2. Distribution of guest molecules in a two-dimensional plane,3. Quality of the Layered Structure,4. Thermal Stability of the Layered Structure.Furthermore, the supermolecular structure was used as a field of photofunctions such as excitation energy transfer and photoinduced electron transfer processes. The photophysical characteristics of polymer LB films were manifested. The results indicated that the amorphous polymers have various advantages as LB materials : variety of the chemical structure, fewer pinholes, thinness of one layer, easy introduction of functional units, and uniform distribution of the guest moieties. These shows that the polymer LB films are promising new materials for realizing artificial molecular assemblies.