New matrix precursor for carbon-carbon composites—COPNA resin

Uncross-linked condensed polynuclear aromatics(COPNA)resins were prepared using benzaldehyde as cross-link agent and naphthalene as monomer with the presence of strong sulfuric acid catalyst.Synthesis reaction and thermostability of COPNA resins were analyzed by DTA/TG,IR spectra,etc.COPNA-B resin impregnation was used to densify performs wraped with T300 6K carbon-cloth in order to get carbon fiber reinforced COPNA-based carbon-carbon composites.After impregnation,solidification and carbonization in the normal pressure reactor,char yield reached 53.15%.The findings indicate that char yield will be increased by optimizing the molar ratio of monomer and cross-link agent and mass content of catalyst,which expresses COPNA resin is a new kind of promising matrix precursor of carbon-carbon composites.