STTR Phase I: Development of Fourth Generation High Temperature Materials

这个小型企业技术转移（STTR）第一阶段项目将开发和表征一类新型苯乙烯端端热固性聚酰亚胺/无机杂化树脂的结构、性能和加工关系。对具有371-454C （700-900F）延长使用寿命耐久性的聚合物基复合材料（PMC）的需求日益增长：(i)与现有的制造程序（高压灭菌器，树脂传递成型，树脂注入等）兼容，（ii）表现出至少与最先进的聚酰亚胺相当的机械性能和耐化学性，以及（iii）可以承受国防航空航天，导弹，NASA和空军运载火箭应用的恶劣服务环境。具有这些特性的材料目前还不存在，但可以用于这些和许多其他未来系统。目前最先进的pmc仅限于国防应用、深海钻井、商用飞机发动机和可重复使用运载火箭（RLV）技术所需的恶劣环境，最多可扩展使用温度343C （650F）。处理和性能的必要平衡结合有机化学的基本限制产生了这个极限。该项目的新型混合方法结合了美国空军和NASA研究实验室开发的最先进的热固性聚酰亚胺的已知结构-性能-加工关系，以及学术界和工业界目前对无机和有机/无机混合聚合物的理解。从分子水平构建拟议的“第四代”材料代表了最先进的技术。

This Small Business Technology Transfer (STTR) Phase I project will develop and characterize the structure property- processing relationships for a novel class of phenylethynyl terminated thermosetting polyimide/inorganic hybrid resins. There exists a growing need for polymer matrix composite (PMC) materials capable of 371-454C (700-900F) extended service life durability that: (i) are compatible with existing fabrication procedures (autoclave, resin transfer molding, resin infusion, etc.), (ii) exhibit at least equivalent mechanical performance and chemical resistance to state of the art polyimides, and (iii) can withstand the aggressive service environments of defense aerospace, missile, and NASA and Air Force launch vehicle applications. Materials with these properties do not presently exist, but are enabling for these and many other future systems. Current state of the art PMCs are limited to, at best, 343C (650F) extended service temperatures for aggressive environments required in defense applications, deep sea drilling, commercial aircraft engines, and reusable launch vehicle (RLV) technology. Necessary balancing of processing and performance combined with fundamental limitations in organic chemistry yield this limit. This project's novel hybrid approach combines known structure-property-processing relationships of state of the art thermosetting polyimides developed at Air Force and NASA research laboratories with the current understanding of inorganic and organic/inorganic hybrid polymers provided by academia and industry. Building the proposed "Fourth Generation" materials from the molecular level represents a state of the art technology.