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On the thermal degradation of cellulose allomorphs

Domenii publicaţii > Chimie + Tipuri publicaţii > Articol în revistã ştiinţificã

Autori: Ciolacu, Diana; Popa, Valentin I.

Editorial: CELLULOSE CHEMISTRY AND TECHNOLOGY, 40 (6), p.445-449, 2006.

Rezumat:

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 that of cellulose I or II.

Cuvinte cheie: cellulose allomorphs, crystallinity, thermogravimetry, differential thermogravimetry