An investigation of thermal degradation and charring of larch lignin in the condensed phase: the effects of boric acid, guanyl urea phosphate, ammonium dihydrogen phosphate and ammonium polyphosphate

摘要: The thermal degradation and charring of larch lignin treated with boric acid, guanyl urea phosphate, ammonium phosphate polyphosphate in the condensed phase, were investigated by a combination thermogravimetry (TGA) X-ray photoelectron spectroscopy (XPS). TGA data under nitrogen indicated that had very high char forming ability. Data from both XPS demonstrated dihydrogen did not show an obvious effect. This is because highly crosslinked carbon-carbon bonds between guaiacyl propane units, which could be further proven showing low binding energy at room temperature compared manchurian ash reported our previous work. In air, completely decomposed 500 °C, however, flame retardants, especially polyphosphate, promote formation untreated lignin. experimental results effective agent air for lignin, attributed to catalytic crosslinking effect polyphosphoric acid produced decomposition.