Thermal degradation and flammability studies of wood coated with fly ash intumescent composites

摘要

In the present study, poplar (Populus) wood is coated with intumescent formulation (ammonium polyphosphate/melamine/pentaerythritol), using acrylic resin as binder. Samples have also been prepared by adding fly ash (FA) in intumescent formulation at different loading levels. Thermal stability of composites has been studied with thermogravimetry, derivative thermogravimetry and differential thermal analysis. Limiting oxygen index and Underwriter’s Laboratory (UL 94) studies point toward an appreciable increase in flame retardancy for intumescent coated sample and goes on increasing as loading of FA in intumescent formulation increases. Scanning Electron Microscopy is used to explain flame retardant mechanism of composites.