ON THE THERMAL DEGRADATION OF CELLULOSE ALLOMORPHS

摘要

The complexity of cellulose thermal degradation results from the large number of parallel and consecutives reaction steps,from the change of the predominant reaction route with degradation temperature,from the intense influence of the ambient atmosphere on the degradation process and,last but not least,from the important role played by the structure of cellulose sample in thermal degradation.To determine the effect of the supramolecular structure on cellulose thermal decomposition,three crystalline forms of cellulose - I,II and III,respectively-have been prepared.For a systematic analysis of the thermal behaviour of cellulose allomorphs,cotton cellulose was used.The thermal properties of cellulose allomorphs were investigated by TG,DTG and DTA techniques.The study shows that the crystal form,as well as the crystallinity index,can affect the thermal stability of cellulose allomorphs;it appears that the thermal stability of cellulose III crystal form is lower than those of cellulose I or II.