Study On The Thermal Degradation Of Cotton Cellulose Treated With Flame Retardants

This thesis consists of four sections.First of all, the necessity of studying on the flame retardance of textiles was reviewed, as well as the recent studies on the thermal degradation of cotton with flame retardants was analyzed. Then the significance and purpose of this paper were also summarized. Forty-six references were cited.Secondly, cotton cellulose was treated with flame retardants such as inorganic compounds, tetrakis(hydroxymethyl)phosphonium chloride(THPC), N-methyloldimet-hylphosphonopropionamide(CP) and synergistic agents. The flame retardance and thermal degradation of the treated cotton were studied by thermal analysis, IR, and limiting oxygen index. Compared with pure cotton cellulose, the changes of thermal decomposition behavior in the treated cellulose are as follows: (a) lowering in thermal degradation onset temperature; (b) decreasing in the activation energy of decomposition process; (c) increasing in char yield and limiting oxygen index.Thirdly, coordinate complexes of cellulose treated with flame retardants were prepared by reacting with metal ions. The thermal degradation of them was studied by thermal analysis, IR, and char yield. The results show that the activation energies of them decrease further, and char yields increase a little.Finally, thermal degradation of hemp cellulose treated with various compounds containing phosphorus, nitrogen and boron was studied by DTA/TG and SEM. The results suggest that phosphorus can catalyze dehydration and char yielding, that nitrogen can decompose into the inert gas preventing hemp from burning, that boron can form the glassiness layer cutting off the source of oxygen and heat.