可溶性热塑性双酮酐型聚酰亚胺及其碳纤维复合材料的制备与性能研究

Because the mechanical properties of composites depend on not only the properties of the constituent materials but also the nature of the interfacial bond and the mechanism of load transfer, the topic of the fiber/matrix interface, or ‘‘interphase’’ has been the subject of considerable research. For carbon fibers, a number of surface treatments have been used to improve adhesion at the fiber/matrix interface. Interfacial adhesion is typically improved by enhancing the chemical interaction at the interface or by increasing the fiber surface area, providing a larger area over which to transfer load. This proposal intends to design and synthesis the polyimide with di-ketone anhydride groups then develop the novel carbon fiber / polyimide composites with excellent performance. The lab made 4,4’-terephthaloyldiphthalic anhydride (TDPA), 4-bis (3, 4- dicarboxpheyl) phthaloyphthalicbiphey anhydride (BPPA), bis (3, 4- dicarboxpheyl) phthaloyldiphthalic dipheylether anhydride (BPOPA) and aromatic diamine which containing the aryl ether ketone or the aryl ether sulfone structure will be used as the monomers. By the thermal imidization or the chemical imidization, PAA films converte to the polyimide (DKPA-PI). In the above condensation reaction, we shall investigate the impact using different starting material and the molar ratio of the DKPA to the aromatic diamine. The new formulation should then possess a low melt viscosity, high green strength, fast setting speed, yet exhibit exceptional adhesive and cohesive performance. The impact of the PI molar content and the semi-flexible main chain segments will be characterized. It is our hypothesis that this combination can enhance the thermal stability and mechanical properties of the final DKPA-PI/CF composite materials beyond what traditional CF prepreg chemistry can provide. In this study, all aspects of the preparation process and the thermal stability the of the DKPA-PAA, DKPA-PI and PI-CF will be analyzed. Their mechanical performance will be evaluated using traditional stress-strain techniques, in conjunction with our unique time resolved spectroscopy capable of measuring the changes at both the macro and micro levels. This new proposal is based on the accomplishments of the NSFC research funded previously. We have gained a great deal experience working with PI systems. The research results about the polyimide resin and its carbon fiber composite materials used in aerospace, aviation and other fields to provide experimental and theoretical basis.

碳纤维增强树脂基复合材料(CFRP)的研究与应用一直是新材料领域世界各国优先发展和应用的主体。本研究旨在设计合成新型双酮酐型聚酰亚胺，研究碳纤维与双酮酐型聚酰亚胺树脂的表面处理技术，从而开发一类性能优异的新型碳纤维/聚酰亚胺（CF/PI）复合材料。从PI结构与性能的关系分析出发，合成TDPA、BPPA和BPOPA等聚合级双酮酐。双酮酐单体与含芳醚酮、芳醚砜等结构的芳二胺缩聚，合成高分子量的双酮酐型聚酰胺酸（DKPA-PAA）。热亚胺化和化学亚胺化将DKPA-PAA转变为双酮酐型聚酰亚胺（DKPA-PI）。筛选出适合于预浸料法及薄膜镶嵌法制备碳纤维（CF）复合材料工艺要求的PI新品种。合成、研究和表征高性能热塑性双酮酐型聚酰亚胺（DKPA）以及DKPA和碳纤维复合材料的结构和性能，为航空航天等领域的实际应用提供可熔融加工、性能卓越的热塑性CF/PI复合材料。

全芳香族聚酰亚胺作为一类重要的高性能聚合物，因其具有高的耐热性和热氧化稳定性，低的介电常数，优异的力学性能和耐化学性等显著特点而引起了人们的广泛关注，其在航空航天、电子等高科技领域的应用也在迅速增加。碳纤维增强树脂基复合材料的研究与应用一直是新材料领域世界各国优先发展和应用的主体。本研究旨在设计并合成一系列新型的聚二酮酰亚胺，并期望发展一类性能优异的新型碳纤维/聚酰亚胺复合材料。. 本项目以邻二甲苯、对苯二甲酰氯等芳二酰氯为主要原料，探索了1,4-双(3,4-二羧基苯甲酰基)苯二酸酐等4 种二酮二酸酐的制备方法，随后将其与芳香族二胺缩聚，首先得到聚酰胺酸，继而进行热亚胺化或化学亚胺化，制得了一系列聚二酮酰亚胺，并对其溶解性、热稳定性、结晶性和机械性能等进行了分析表征，考察了聚合物的结构和性能关系，初步探索了聚二酮酰亚胺与碳纤维的复合工艺及其复合材料的性能，并为其潜在的应用提供一定的实验依据和理论基础。