Functionalized Rigid Polymers

9424317 KW本研究的主要目的是阐明取代基对刚性聚合物的溶解性、凝胶化、凝固层结构的形成、侧链结晶和相容性的影响。用刚性聚合物的侧链取代来改善溶解性现在是一种成熟的策略。过去对磺化聚对苯二甲酰胺的研究得到了一种可溶于多种溶剂的聚合物。然而，这些溶液一站起来就变成了凝胶。双折射凝胶具有向列型液晶结构，具有热可逆性。该聚合物显示出作为高能电池应用的固体聚合物电解质的潜力。当交联时，对电场刺激的机械力化学反应类似于柔性聚电解质凝胶的反应。本研究由四个部分组成。第一部分是关于磺化芳香族聚酰胺在溶液中聚集的动力学以及随后溶液转变为凝胶的动力学。动态光散射测量将被用来监测聚集现象。第二部分将继续金属离子导电固体聚合物聚电解质和电场刺激的研究。研究的第三部分包括具有新结构的取代聚(对苯基)和由这些聚合物衍生的分子复合材料。研究侧链结晶和堆积层结构是这项工作的一个重要方面。研究的第四部分涉及取代纤维素的合成，以测试具有长烷基侧基的半柔性主链是否可以自组装成堆积层结构。***

9424317 Kwei The primary objective of the research is to elucidate the influence of substituent groups on the solubility, gelation, formation of staaked layer structure, side-chain crystallization, and miscibility of rigid polymers. Side chain substitution of rigid polymers to improve solubility is now a well-established strategy. Past work on sulfonated poly(p-phenylene terephthalamide) resulted in a polymer which was soluble in many solvents. The solutions, however, turned into gels upon standing. The birefringent gels showed nematic liquid crystalline structures and were thermoreversible. The polymer showed potential as a solid polymer electrolyte for high-energy battery applications. When crosslinked, the mechanochemical response to electrical field stimulation was similar to the responses of flexible polyelectrolyte gels. %%% The study consists of four parts. The first part is concerned with the kinetics of aggregation of sulfonated aromatic polyamide in solution and the subsequent transformation of the solution into a gel. Dynamic light scattering measurements will be used to monitor the aggregation phenomenon. In the second part, the study on metal-ion conducting solid-polymer polyelectrolytes and electric-field stimulation will be continued. The third part of the study includes substituted poly(p-phenylenes) having novel structures and molecular composites derived from these polymers. Investigation of side chain crystallization and stacked layer structures is an important aspect of the work. The fourth part of the study involves the synthesis of substituted cellulose to test whether semi flexible main chains having long alkyl side groups can self assemble into stacked layer structures. ***