Thermogravimetric Analysis and Pyrolysis Kinetics of Cotton Fabrics Finished with THPOH-NH3

Abstract

Abstract Unmodified cotton and cotton fabrics finished with eight add-ons of THPOH-NH3 were subjected to thermogravimetric analysis in a vacuum and in nitrogen. Nitrogen had no effect on the thermogravimetric data. THPOH-NH3up to 6% add-on lowered temperatures of maximum pyrolysis rates and decreased the weight loss per unit weight of cellulose. Additional add-on had little further effect. Arrhenius plots showed that the cellulose pyrolysis occurred in consecutive stages, the initial stage and a main stage. These stages were followed by a char pyrolysis. The main pyrolysis stage followed a first-order rate law. THPOH-NH3 up to 6% add-on increased the energy of activation for this stage from 62 to 97 kcal/mol and the entropy of activation from 29 to 104 cal/deg'mol. Again, additional add-on had little further effect. These thermogravimetric and kinetic data are interpreted in terms of a model for the main cellulose pyrolysis stage.