Heat Aging and High Temperature Mechanical Properties of PBO Fiber Paper-based Composites
Poly-p-phenylene benzobisoxazole(PBO)paper was prepared by wet forming technology,and then impregnated with polyimide(PI)resin to obtain PBO fiber paper-based composite(PBO/PI).Then the PBO/PI was aged at 300 ℃,and the tensile properties were test-ed at 300 ℃.The effects of aging and high temperature on the mechanical properties of PBO/PI and meta-aramid impregnated paper(PMIA/PI)simulated honeycomb lattice wall were analyzed and compared.The results showed that the tensile strength of both PBO/PI and PMIA/PI decreased due to the formation and expansion of microcracks after aging at 300 ℃,whereas the strength of PBO/PI before and after aging was stronger than that of PMIA/PI.The dynamic mechanical properties showed that the storage modulus of PBO/PI before and after aging was greater than that of PMIA/PI,indicating that the rigidity of PBO/PI was greater than that of PMIA/PI,PBO/PI was not easy to deformation at high temperature.The tensile strength and retention ratio of PBO/PI were higher than those of PMIA/PI when they were tested at 300 ℃.The mechanical properties of PBO/PI were better than those of PMIA/PI at room temperature and 300 ℃.The composites prepared by PBO fiber could be used in load-bearing structures and honeycomb parts requiring high deformation resistance and thermal stability.
PBO fiber paper-based compositesaginghigh temperature testingmechanical properties
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