- II - ABSTRACT Preparation and Properties of Carbon Nanotubes and Graphene Reinforced PEI Composites ABSTRACT With the development of aerospace industry, the requirement of polyimide composites is higher and higher. Carbon nanoparticle reinforced polyetherimide (PEI) composite is an important method to obtain high performance polyimide materials. The specific surface area of carbon nanoparticles is large, the theoretical strength and modulus of carbon nanoparticles are high, especially the carbon nanotube with one dimensional structure and graphene with two-dimensional structure, which shows the