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Heat Aging and High Temperature Mechanical Properties of PBO Fiber Paper-based Composites
Received:December 22, 2023  
DOI：10.11980/j.issn.0254-508X.2024.04.013
Key Words:PBO fiber paper-based composites  aging  high temperature testing  mechanical properties
Fund Project:国家重点研发计划（2021YFB3700104）。
Author NameAffiliationPostcode
SONG Zizhi School of Light Industry and Engineering， South China University of Techonlogy， Guangzhou， Guangdong Province， 510640 510640
LIAO Sihuang School of Light Industry and Engineering， South China University of Techonlogy， Guangzhou， Guangdong Province， 510640 510640
LONG Jin* School of Light Industry and Engineering， South China University of Techonlogy， Guangzhou， Guangdong Province， 510640 510640
WANG Yi School of Light Industry and Engineering， South China University of Techonlogy， Guangzhou， Guangdong Province， 510640 510640
XIONG Zhiyuan School of Light Industry and Engineering， South China University of Techonlogy， Guangzhou， Guangdong Province， 510640 510640
HU Jian School of Light Industry and Engineering， South China University of Techonlogy， Guangzhou， Guangdong Province， 510640 510640
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Abstract: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 tested 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.
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