SUPERCRITICAL FRACTIONATION OF PYRENE OLIGOMERS FOR ENHANCED MATERIALS PROPERTIES

摘要

As new technologies are developed, one concern that must be addressed is the heat that they are producing. When exposed to high temperatures for long periods of time, the lifespan of many devices steadily decreases. This drives up the demand for materials with high thermal conductivities, while still maintaining a lightweight structure. A suitable precursor for these materials is polycyclic aromatic hydrocarbons (PAH's). It has been found that when PAH monomers are heated in an inert atmosphere, they have the ability to transition from an isotropic phase to a liquid crystalline phase [1,2]. In their more ordered liquid crystalline state, these materials can serve as precursors for advanced carbon materials such as high thermal conductivity carbon fibers, carbon electrodes, and carbon-carbon composites [3,4].