Supermolecular Structure of Wholly Aromatic High Performance

全芳香族高性能超分子结构

基本信息

批准号：
06651045
负责人：
TAKAHASHI Toshisada
金额：
$ 1.47万
依托单位：
Fukui University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1994
资助国家：
日本
起止时间：
1994 至 1995
项目状态：
已结题

项目摘要

Recently, various kinds of wholly aromatic polymers have become important as high performance meterials. In the present research project, the supermolecular structure of some new aromatic polymers, phase behavior and structure of the thermoplastic polyimede (N-TPI)/ poly (ether imide) blends, crystal structure of poly (ketone sulfide) (PKS) have been studied using transmission electron microscope, DSC,wide-angle and small-angle x-ray diffractometry (WAXD & SAXS). The following results were obtained.(1) N-TPI,poly (ether nitrile) (PEN), and PKS form the folded chain crystals during the crystallization from the melt and the solution. The narrow lamellar habit is common among these aromatic polymers with usual molecular weight. (2) The morphology of the N-TPI melt-grown crystals and solution-cast thin films is very sensitive to its molecular weight. N-TPI with molecular weights larger than 55,000 do not crystallize from the melt. (3) N-TPI and PKS crystals grow rapidly along the b-axs, wh … More ereas PEN crystals grow rapidly along the a^<**>-axis, along which the cyano groups are arranged. N-TPI and PKS forms negative spherulites during the crystallization from the melt, whereas PEN forms positive spherulites. Attempts have been made to elucidate the origin of the morphological characteristics of PEN on the basis of its crystal structure. (4) N-TPI and PEI are fully miscible in the melt-quenched amorphous state. The N-TPI/PEI blends show very complicated phase behavior during the heat treatment at 260-360ﾟC.The SAXS studies of the blends lead to the conclusion that PEI segments are incorporated in the amorphous layr between the stacked N-TPI crystals. (6) Orthorhombic crystal of PKS is transformed into the monoclinic crystal during the drawing and rolling. (7) Some poly (amic acid) s (PAAs) synthesized from pyromellitic anhydride and some rigid-type aromatic diamines give optically heterogeneous solutions in which the negative spherulites are observed. The folded-chain crystals grow from dilute PAA solution during the imidizatin-crystallization. It has been suggested that flexible PAA segments are located on the fold surface of the polyimide crystals. Less

近年来，各种全芳香族聚合物作为高性能材料已成为重要的研究项目，一些新型芳香族聚合物的超分子结构、热塑性聚酰亚胺（N-TPI）/聚醚酰亚胺的相行为和结构。使用透射电子显微镜、DSC、广角和小角 X 射线衍射仪（WAXD 和(1)N-TPI、聚醚腈(PEN)和PKS在熔体和溶液中结晶时形成折叠链晶体，其中窄层状晶体是常见的。 (2) N-TPI熔体生长晶体和溶液浇铸薄膜的形貌对其分子量大于的N-TPI非常敏感。 55,000 不会从熔体中结晶。 (3) N-TPI 和 PKS 晶体沿 b 轴快速生长，而 PEN 晶体沿 a^<**> 轴快速生长，氰基沿该轴快速生长。 N-TPI 和 PKS 在熔体结晶过程中形成负球晶，而 PEN 形成正球晶。 (4) N-TPI 和 PEI 在熔融淬火非晶态下完全混溶 N-TPI/PEI 共混物在 260 ℃的热处理过程中表现出非常复杂的相行为。 -360°C。对共混物的 SAXS 研究得出的结论是，PEI 片段被纳入堆叠的 N-TPI 晶体之间的非晶层中 (6)。 PKS 的斜方晶体在拉伸和轧制过程中转变为单斜晶体。 (7) 由均苯四酸酐和一些刚性型芳香族二胺合成的一些聚酰胺酸 (PAA) 会产生光学异质溶液，其中负球晶为负球晶。观察到折叠链晶体在酰亚胺结晶过程中从稀 PAA 溶液中生长出来。位于聚酰亚胺晶体的折叠表面上较少。