Abstract
A charring behavior was found during the combustion of para-aramid chopped fibers/polyphenylene sulfide (ACFs/PPS) composite paper, which formed a highly graphitized carbon layer structure with specific mechanical properties. This sturdy structure is composed of a dense carbon layer mixed evenly between the inner and outer layers, the outer layer can effectively block the spread of oxygen and degradation products, as well as external heat radiation, while safeguarding the inner layer's structural integrity. Herein, we systematically researched the flame retardancy and thermal degradation properties of ACFs/PPS composite paper. In combustion testing, the char of ACFs/PPS composite paper could support a weight of 50 g, while the neat aramid paper was burned through by fire, which indicates the Charcoal-forming property of ACFs/PPS composite paper is better than that of neat aramid paper, and ACFs/PPS composite paper has better fire resistance because of its good char formation. Meanwhile, we further showcase the application in electrically insulating and firefighting clothing interlayers.
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