writer：Dan Guo, Qi Wang, Shibing Bai
keywords：poly (vinyl alcohol), melamine phosphate, composite foams, intumescent flame retardant, thermal processing
source：期刊
specific source：http://onlinelibrary.wiley.com/doi/10.1002/pat.3089/abstract
Issue time：2013年
Abstract: Poly (vinyl alcohol)/melamine phosphate composites (PVA/MP) as a novel halogen-free flame retardant foam matrix were prepared through thermal processing, and then their thermal stability and flame retardancy were investigated by thermo-gravimetric analysis (TGA), micro-scale combustion calorimeter (MCC), cone calorimeter, vertical burning test and limiting oxygen index test (LOI). It was found that the thermal stability and combustion properties of the PVA/MP composites could be influenced by the addition of MP. Compared with the control PVA sample (B-PVA), in the PVA/MP (75/25) composites, the temperature at 5% mass loss (T_5%) decreased about 10 oC, the residual char increased nearly by 27%, the temperature at the maximum peak heat release rate (T_P) shifted from 292 oC to 452 oC, the total heat released (THR) and the heat release capacity (HRC) decreased by 28% and 14%, respectively. Moreover, the PVA/MP composites could reach limiting oxygen index value (LOI) up to 35% and UL94 classification V-0, showing good flame retardancy. At the same time, both FT-IR and XPS spectra of the residual chars from the PVA/MP composites demonstrated that the catalytic effect of MP on the dehydration and decarboxylation reactions of PVA, and the chemical reactivity of MP during the chars forming reactions could be used to account for the changed thermal stability and flame retardancy of the PVA/MP composites.