Conformation and Configuration Transitions in Thermotropic Liquid Crystal Polymers

9312823 Geil开发“刚性棒状”热致液晶聚合物潜力的一个主要问题是，目前对合成和加工对a)共聚物的构型(聚体顺序)和b)同质和共聚物在使用和加工状态下的“晶体结构”(构象、迁移率和堆积)的影响缺乏了解。使用氧基苯甲酸酯-氧代萘甲酸酯系列聚酯作为一般的液晶聚合物，主要是利用以特别适合于研究的方式合成的单晶在室温和高温下的电子衍射研究，辅之以X射线衍射、电子显微镜、红外光谱和热分析来寻求上述问题的解决方案。人们认为，这些观察结果也与理解非液晶聚合物的结晶问题有关。***

9312823 Geil A major problem in the development of the potential of "rigid-rod" thermotropic liquid crystal polymers is to current lack of understanding of the effect of synthesis and procesing on a) the configuration (mer sequence) of copolymers and b) the "crystal structure" (conformation, mobility and packing) of both homo- and copolymers in the as-used and as-processed states. Using the oxybenzoate-oxynaphthoate family of polyesters as generic liquid crystal polymers, the solutions to the above problem are being sought using, primarily, electron diffraction studies at room and elevated temperature of single crystals synthesized in a manner particularly suitable for the research, complemented by x-ray diffraction, electron microscopy, infrared spectroscopy and thermal analysis. The observations, it is believed, are also of relevance to the problem of understanding the crystallization of polymers that are not liquid crystalline in nature. ***