DSC, DTA, AND TG OF CELLULOSE UNTREATED AND TREATED WITH FLAME-RETARDANTS

DSC of untreated cellulose and cellulose treated with diammonium hydrogen phosphate, sodium tetraborate decahydrate, boric acid, ammonium sulfamate, or guanidine sulfamate, was conducted in a nitrogen atmosphere. In addition, DTA and TG under vacuum were performed for untreated cellulose and cellulose treated with the above first two salts. Two endotherms were found on both DSC and DTA curves, and these as well as the effects of the chemicals on the DSC and DTA behavior were explained by a pyrolysis chain reaction mechanism. The endothermic heat due to the weight loss was reduced by treatments with ammonium sulfamate and guanidine sulfamate, and was increased by treatment with boric acid. The decrease in heat may be due to depropagation accelerated by the addition of salts. The increase is ascribable to the termination accelerated by boric acid.