GOALI: Gas Transport and Barrier Properties Aromatic Polyamides

摘要CTS-9803225 Benny Freeman/N.C.州立大学 专有的无定形聚酰胺在商业上用于气体分离应用;液晶（LC）芳香族聚酰胺是最不渗透的阻隔聚合物。 然而，全芳族聚酰胺通常和特别是LC聚酰胺通常难以溶解，并且具有接近或高于其分解温度的熔点;因此，这些材料的熔融和溶液加工可能相当困难。 此外，新的更高性能芳族聚酰胺的合成可能由于它们缺乏溶解性而受到阻碍。 拟议的实验研究计划是一个早期的两年计划的延续，以探索合成和气体吸附，运输和渗透性能的一类新的高度可溶性的全芳族聚酰胺，具有刚性杆，可能介晶，骨干或半棒状骨干和结构元素，这可能是进一步的反应，如交联或悬垂的刚性或柔性基团的附件的前体。 这些基础研究是针对开发一个扩展的和更微妙的结构修饰的合理剪裁的超膜和超屏障有用的剧目。 中心的论文正在考虑的概念，提出的主要化学结构的变化可能会显着影响聚合物超结构（即聚合物链堆积），聚合物渗透剂的相互作用，并反过来，强烈影响气体吸附，运输和渗透性能。 提出了一个实验方案，涉及控制合成具有取代基的高溶解性全芳族聚酰胺，该取代基可用于交联聚合物或连接刚性或柔性侧链。 这些聚合物的化学结构、物理性质和气体传输性质将被表征，以明确地确定侧链和主链分子结构和侧链刚性的影响，加上交联的可能性，对整体吸附、传输和渗透行为的影响。 ***

ABSTRACT CTS-9803225 Benny Freeman/N.C. State U. Proprietary amorphous polyamides used commercially in gas separation applications; liquid crystalline (LC) aromatic polyamides area among the most impermeable barrier polymers available. However, wholly aromatic polyamides in general and LC ones in particular are typically difficult to dissolve and have melting points near or above their decomposition temperatures; melt and solution processing of these materials can be, therefore, quite difficult. Moreover, the synthesis of new higher performance aromatic polyamides can be impeded by their lack of solubility. The proposed experimental research program is a continuation of an earlier two year program to explore the synthesis and gas sorption, transport, and permeation properties of a new class of highly soluble wholly aromatic polyamides, having either rigid rod, possibly mesogenic, backbones or semi-rodlike backbones and structural elements which could be precursors for further reactions such as crosslinking or the attachment of pendent rigid or flexible groups. These fundamental studies are directed toward developing an expanded and more subtle repertoire of structural modification useful for the rational tailoring of super-membranes and super-barriers. Central to the thesis under consideration is the notion that the proposed primary chemical structure variations could markedly influence polymer suprastructure (i.e. polymer chain packing), polymer-pentrant interactions, and, in turn, strongly effect gas sorption, transport, and permeation properties. An Experimental program is proposed involving controlled synthesis of highly soluble wholly aromatic polyamides having substituents which could be used to crosslink the polymers or attach rigid or flexible side chains. The chemical structure, physical properties, and gas transport properties of these polymers would be characterized to determine explicitly the influence of side and main chain molecular architecture and side chain stiffne ss, plus the potential for crosslinking, on the overall sorption, transport, and permeation behavior. ***