Study On The Compatibility Of Carbon Fiber Reinforced Resin Matrix Composite With Cryogenic Liquild Oxygen

For the obviously advantage of lightweight of polymer composite Liquid Oxygen (LOX) tank, it is critical and broadly studied in the development of the launch vehicles of next generation, especially in the propelling system. However, the compatibility of the polymer and composite with Liquid Oxygen (LOX) is the one of the essential problems; however, we China were badly lagged in this scientific area. The compatibility of the polymer and composite will be mainly discussed in the following paper. We will endeavor to narrow the gap between china and the advanced countries and wish to the lay a good foundation of this area for the following researchers.This paper start from the mechanism of the compatibility of polymer with LOX, selected epoxy and cyanate ester as the basic resin system after a broadly test. Used copolymerization and nano-SiO₂ particles modify method to enhance the compatibility of polymer with LOX. The biphenol-A epoxy(E51/CE) shows better integrative properties than TDE85/CE. The heat-resistant quality, carbonization and thermal oxidative properties improved with the nanoo-SiO₂ particles introduced into the resin system.Analyse the results of the LOX impact test of polymer and composite we found that, E51/CE resin system show a lower IRS, the resin system with 2% or 5% nano-SiO₂ particles obviously reduce the IRS of E51/CE resin system. Some polymer micromolecule will introduced when modified the resin system with sol-gel method, which will increase the IRS with LOX. Prepare the composite with E51/CE as matrix and T700 carbon fiber as reinforcement show better in the LOX impact test, however, the defect and delimitation area may developed as"hot point"which will cause to uncompatibility.The research on cryogenic property and mechanical property shows that, with the nano-SiO₂ particles added in, the strength &toughness of the polymer is improved. And also perform better after the high-low temperature cycling test. After25times high-low temperature cycling the property of composite laminate panel almost stay the same, however, in the LOX environment the shearing strength of T700/E51/CE composite improved 6.6%,and the shearing modules improved 37.5%.