TUNABLE THERMAL, FLAME RETARDANT AND TOXIC EFFLUENTS SUPPRESSION PROPERTIES OF POLYSTYRENE BASED ON ALTERNATING GRAPHITIC CARBON NITRIDE AND MULTI-WALLED CARBON NANOTUBES

摘要

a highly effective graphitic carbon nitride/acidized multi-walled carbon nanotube(g-C3N4/aMWCNT) bilayer was deposited on PS sphere for reducing its fire hazards.The PS sphere allowed the intimate assembly of g-C3N4/aMWCNT bilayer on its surface through electrostatic interaction.Structural and morphological characterization revealed the successful assembly of PS/g-C3N4/aMWCNT systems.Enhanced thermal stability and flame retardancy(e.g.decrease of ca.45％ and 47％ in HRR and THR,respectively) were obtained for the ternary assembled systems instead of the binary materials.The phenomena were caused by two reasons:g-C3N4/aMWCNT bilayers induced the construction of the "tortuous path" which impeded the permeation of heat and the escape of pyrolysis volatile products; on the other hand,stacked g-C3N4 nanosheets or thermolabile aMWCNTs with uncompact network structure led to poor thermal stability and fire resistance.Thus,this work paves a potential pathway to design efficient assembled fire-retardant systems for fire safety.