Thermogravimetric analysis of cellulose: Effect of the molecular weight on thermal decomposition

Abstract

SynopsisCellulose fractions of different molecular weights were subjected to dynamic thermogravimetric analysis in a nitrogen atmosphere. From the experimental data, activation energies and reaction orders were obtained following the Freeman-Carroll and Broido methods. The thermal stabilities of the samples were estimated taking into account the values of T,, T,,,, and E,. The results show that thermal stability increases as the molecular weight increases. It was also found that the cellulose pyrolisis process cannot be described as having a single value of E, over the entire pyrolisis range. The dependence of E, on molecular weight is also discussed.

Modification of cellulose acetate membrane using monosodium glutamate additives prepared by microwave heating

“…As discussed in previous section, MW caused chain scission and thus shortened CA chains. The results seemed to be in agreement with the work done by Calahorra et al [42] where higher molecular weight cellulose promised a better thermal stability property. When MSG was present, the thermal stability of MWCA series membranes was improved, but the additive contributed a negative impact on TMCA series membranes.…”

Kinetic study of the thermal decomposition of cellulose nanocrystals with different polymorphs, cellulose I and II, extracted from different sources and using different types of acids

“…For all samples the order of reaction approximately to the unit. It can be seen from these results that the order of reaction decreased as the degree of polymerization decreased, as reported by Calahorra (Calahorra et al, 1989).…”

Can ionic liquids dissolve wood? Processing and analysis of lignocellulosic materials with 1-n-butyl-3-methylimidazolium chloride

“…While qualitatively, this indicates that the variations in the morphology and degree of polymerization (DP) of the celluloses recovered from the IL-based wood liquors are within those of pure and [C 4 mim]Cl-processed MCC. 23 As a final assessment of their physical properties, we explored the use of the regenerated samples in the preparation of cellulose-based membranes following methods described earlier by us. 24 Briefly, 5 wt% solutions of the reconstituted celluloses redissolved in [C 4 mim]Cl were prepared, cast onto glass plates as thin films, and perfused extensively with water.…”