Research On Carbon Fiber Reinforced Graphene-TiO₂Modified Cyanate Matrix Composite And Electron Irradiation Resistance

The fiber reinforced cyanate matrix composites have been widely used in theaerospace field, automobile field and so on. Cyanate ester resin（CE） is a novelthermosetting resin, and it has been widely used. In this thesis, CE was modified withnano graphene-TiO₂（GE-TiO₂）to improve the physical property and electronirradiation resistence. Essential data and theoretical support were given for theapplication of CE in space application.GE-TiO₂was synthesized by sol-gel method using graphene oxide （GO） andbutyl titanate.By means of incorporation GE-TiO₂into CE,new type GE-TiO₂reinforced cyanate matrix（GE-TiO₂/CE） and the carbon/cyanate （C/CE）nano-composites were fabricated. The micro structure of composites were analyzedand characterized using XRD, FT-IR,SEM and TEM, etc. It showed that anatase TiO₂attached to the GE, and there chemical bond between them.The effect of GE-TiO₂on thermal property, mechanical properties, dimensionalstability of cyanate ester was investigated. It was shown that CE and thecarbon/cyanate composite can be enhanced and toughened by GE-TiO₂.The new typenano particle composites have better thermal property, dimensional stability thanbefore. When the content of GE-TiO₂is2%, the modified resin’s tensile, bending,compression performance were68MPa,111MPa,168MPa,which were increased by33%,30%and20%than before. The interlayer shear strength of graphite fiber/cyanateester composites are improved about8%.The changes in mechanical properties, mass loss were measured before and afterthe160keV electron irradiation.Due to the addition of the nano graphene-TiO₂,themechanical properities and the resistance to electron irradiation of CE and C/CEincreased obviously.It has shown that the electron irradiation damage mostly occurredin the cyanate matrix, resulting from the cross-linking and degradation effects. Withthe fluence increasing, the mass loss of carbon fiber, CE and C/CE compositesaccordingly increased and then became steady, and the mass loss of CE was biggest.When the fluence was less then1×10¹⁶e/cm², bending strength of GE-TiO₂/CE andthe interlayer shear strength of C/CE nano-composites increased.When the fluenceexceeded1×1016e/cm2, bending strength of GE-TiO₂/CE and the interlayer shear strength of C/CE nano-composites decreased.The properties of the materials have aclose relationship with the cross-linking density of the resin.