STTR Phase I: Development of Fourth Generation High Temperature Materials

这个小企业技术转让（STTR）第一阶段项目将开发和表征一类新型苯乙炔基封端的热固性聚酰亚胺/无机杂化树脂的结构性能-加工关系。对能够在371- 454 ℃（700- 900 F）延长使用寿命耐久性的聚合物基质复合材料（PMC）存在日益增长的需求，所述PMC材料：（i）与现有的制造过程（高压釜、树脂传递模塑、树脂灌注等）相容，(ii)表现出至少与现有技术聚酰亚胺相当的机械性能和耐化学性，和（iii）可以承受国防航空航天、导弹和NASA和空军运载火箭应用的侵蚀性服务环境。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最多限于343 C（650 F）的扩展工作温度，用于国防应用、深海钻探、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。加工和性能的必要平衡与有机化学中的基本限制相结合产生了这种限制。该项目的新型混合方法结合了空军和NASA研究实验室开发的最先进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对无机和有机/无机混合聚合物的当前理解。从分子水平构建所提出的“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.