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Small Business Innovation Research/Small Business Tech Transfer

Functionally Graded Polyimide Nanocomposite Foams for Ablative and Inflatable/Flexible/Deplorable Structures

Completed Technology Project

Project Description

Functionally Graded Polyimide Nanocomposite Foams for Ablative and Inflatable/Flexible/Deplorable Structures
The objective of the proposed research is to develop functionally graded polyimide foams as light-weight, high performance thermal protection systems (TPS) for ablative and inflatable/flexible/deplorable structures used in space exploration missions. In the first phase of this project, we will demonstrate the feasibility of fabricating graded polyimide micro/nanocellular foam structures and characterize their insulation and ablative properties. We propose to fabricate graded polyimide foams with density gradient that are similar to those of functionally graded PMMA foams produced at UT Austin recently, using melt processable thermoplastic polyimide films by a solid-state foaming process with supercritical CO2. Gradient polyimide foam structures with tuned thermal protection properties are unique and not available until now. The advantage of this innovative approach is two folds: 1)Functionally graded, non-homogeneous polyimide foams that allows continuous variation in macroscopic mechanical and physical properties, to tune the thermal conductivity, specific heat, density, and ablative behavior. 2)The use of melt processable polyimides and the solid-state supercritical CO2 foaming process eliminates the needs of using high boiling solvents, and the costly, tedious solvent exchange process, which is required during the making of porous aerogels from solutions. Open-celled polyimide foams with large visible uniform pore sizes have been produced commercially, however, graded porous polyimide thin films with density gradient, open or close celled, are rare and pose more technical challenges, but can provide additional unique benefits. More »

Anticipated Benefits

Primary U.S. Work Locations and Key Partners

Technology Transitions

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This is a historic project that was completed before the creation of TechPort on October 1, 2012. Available data has been included. This record may contain less data than currently active projects.