Effect of borates on thermal degradation and flame retardancy of epoxy resins using polyhedral oligomeric silsesquioxane as a curing agent
writer：Hongyu Yang, Xin Wang, Bin Yu, Lei Song, Yuan Hu*, Richard K. K. Yuen
keywords：Epoxy resin; Synergism; Flame retardant mechanism; Flammability
source：期刊
specific source：Thermochimica Acta
Issue time：2012年
A series of flame-retardant epoxy resins containing boron and silicon were obtained through a crosslinking reaction, using tris (2-hydroxypropyl) borate (THPB) together with octaaminophenyl POSS(OapPOSS) as the curing agents. The limiting oxygen index (LOI) reached 30.5% when the contents ofboron and silicon in the cured system were 1.5% and 0.5%, respectively, indicating that THPB and OapPOSS exhibited good flame retardant effect onepoxy resins (EP). Microscale combustion calorimetry (MCC) results indicated that the peak heat release rate (PHRR) and total heat release (THR) of the cured systems were reduced by 69% and 46%, respectively, compared to those of pure EP. Moreover, the thermal degradation process and flameretardant mechanism of the composites were investigated by TGA, real time FTIR and TG-FTIR. The chemical components of the char residues were explored by XPS.