Poly (vinyl alcohol)/melamine phosphate composites prepared through thermal processing: thermal stability and flame retardancy
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 (T5%) decreased about 10 oC, the residual char increased
nearly by 27%, the temperature at the maximum peak heat release rate (TP)
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.