Technical Operations Support III (TOPS III). Delivery Order 0081: Novel Pitch Materials for High Thermal Conductivity Carbon Fibers, Foams and Composites - Phase 3.

摘要

The overall goal of this project was to control nanotexture of pitch precursors by the introduction nanomodifiers of different aspect ratios, thereby modifying the structure of the resulting fibers. The specific objectives were to: (i) Characterize the dispersion of nanoparticles and the microstructure of the fibers; (ii) Quantify the effect of nanomodification on fiber mechanical properties; and (iii) Develop an experimental protocol to measure and model the high thermal conductivity of such carbon fibers based on their composites. The use of melt mixing was confirmed to be an acceptable method for dispersing carbon nanomodifiers such as SAR MWCNT and carbon black into a mesophase pitch matrix. A method for capturing high-speed images of a carbon fiber during the single-filament tensile recoil test was established. Finite element analysis was used to simulate laser flash analysis on unidirectional carbon fiber-epoxy composites.