2008 NSTI Nanotechnology Conference and Trade Show - Nanotech 2008 - 11th Annual

Partnering Events:

TechConnect Summit
Clean Technology 2008

Supra-Nano-Structured Polyimide-Carbon Composites: Fabrication and Characterization of Thermal and Electrical Properties

J. Su, T.B. Xu, T. Wilkes, S.H. Chu, J. Li, R. Pater
NASA Langley Research Center, US

Keywords:
supra-nano-structured, composites, thermal stability, electrical conductivity

Abstract:
A supra-nano-structured polyimide-carbon composite developed at NASA Langley Research Center exhibited significantly enhanced thermal stability and electrical conductivity compared to the pristine polymer resin. Depending on the resin, the glass transition temperature increased up to more than 50oC with a corresponding reduction of the coefficient of thermal expansion of 40-50%, making the materials more stable thermo-dimensionally and thermo-mechanically. The composite also exhibited significantly high electrical conductivity (up to 4x10o S/cm) and high charging-discharging efficiency. This combination of properties makes the material a promising candidate for multifunctional materials. The fabrication method to make supra-nano-structured polymer-carbon composites will also be described. The results obtained from differential scanning calorimetry, thermal mechanical analysis, and four-pin-probe electrical conductivity analysis, as well as the electrical I-V charging and discharging tests will be presented. To understand the experimental results, possible mechanisms of a free volume controlled thermal stability and a three dimensional path controlled electrical conductivity and corresponding models are proposed.


Nanotech 2008 Conference Program Abstract