Thermal decomposition and charring behavior of polyphenylene sulfide/para-amrid fiber composite paper with excellent fireproof property.

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. This study has revealed a distinct charring behavior during the combustion of ACFs/PPS composite paper. The combustion, thermal degradation, fireproofing, and flame retardancy of ACFs/PPS were all thoroughly researched. The PPS has a considerable impact on the production of a more compact char layer in a condensed phase on the aramid surface during combustion. This structure maximum extent to ensure the structural integrity of ACFs and form residual carbon with certain mechanical properties. At the same time, the carbon structure has good flame and fire resistance. In addition, ACFs/PPS composite paper has the advantages of being lightweight and flexible, which indicates that it has great flexibility in demand. This kind of aramid composite paper with good flame retardant, fireproofing, and heat insulation properties provides a feasible way to be used as the interlayer of firefighting clothing and electrically insulating materials. [Display omitted] • Adding PPS greatly improve the flame retardancy and char yield of aramid paper. • Highly graphitization char layer was formed during the combustion of ACFs/PPS composite paper. • ACFs/PPS composite paper showcase the application in electrically insulating and firefighting clothing interlayer. [ABSTRACT FROM AUTHOR]