Although gas phase phenomena have been reasonably well understood for materials burning, condensed phenomena have not been understood as well as those in the gas phase. Several important processes observed in our experiments for burning of thermoplastic materials will be presented. These are mass transport processes of thermal degradation products through molten thermoplastic materials by bubbling and boiling, capillary process through char and filler additives and also indepth absorption of radiative heat feed back by vibrational absorption bands of polymeric materials. Another important process that often neglected is polymer melt flow of thermoplastics when they are burning in a configuration other than horizontal one.
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