2011
DOI: 10.1590/s0104-14282011005000025
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Abstract: Abstract:Cellulose acetates with different degrees of substitution (DS, from 0.6 to 1.9) were prepared from previously mercerized linter cellulose, in a homogeneous medium, using N,N-dimethylacetamide/lithium chloride as a solvent system. The influence of different degrees of substitution on the properties of cellulose acetates was investigated using thermogravimetric analyses (TGA). Quantitative methods were applied to the thermogravimetric curves in order to determine the apparent activation energy (Ea) rela… Show more

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Cited by 36 publications
(31 citation statements)
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“…While cellulose I chains are orientated in parallel and the CH 2 OH groups of adjacent chains have the same conformation, the cellulose II chains are orientated in antiparallel, with CH 2 OH groups occupying different positions. Because of these differences, the hydrogen bonds in cellulose II are stronger than those in cellulose I, which result in a higher thermal stability of cellulose II in comparison with cellulose I (Morgado and Frollini, 2011). However, it was verified that for CNs samples, the type of acid had a greater influence than type of cellulose polymorph on E a for thermal decomposition.…”
Section: Kinetics Resultsmentioning
confidence: 97%
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“…While cellulose I chains are orientated in parallel and the CH 2 OH groups of adjacent chains have the same conformation, the cellulose II chains are orientated in antiparallel, with CH 2 OH groups occupying different positions. Because of these differences, the hydrogen bonds in cellulose II are stronger than those in cellulose I, which result in a higher thermal stability of cellulose II in comparison with cellulose I (Morgado and Frollini, 2011). However, it was verified that for CNs samples, the type of acid had a greater influence than type of cellulose polymorph on E a for thermal decomposition.…”
Section: Kinetics Resultsmentioning
confidence: 97%
“…CNs from KP extracted using both acids (H 2 SO 4 and HCl) and PMS extracted using HCl showed profiles of cellulose I, while CNs from PMS extracted using H 2 SO 4 and CELL extracted using both acids showed profiles of cellulose II. Morgado and Frollini (2011) studied the thermal decomposition kinetics of untreated linters cellulose (cellulose I) and mercerized linters cellulose (cellulose II). They observed that the value of E a for thermal decomposition of the former was 158 kJ/mol, while E a for the latter was 187 kJ/mol.…”
Section: Kinetics Resultsmentioning
confidence: 99%
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“…This was in agreement with the finding of other authors that cellulose always exhibits a long fiber structure, although the length may differ (El-Sakhawy and Hassan 2006;Adel at al. 2010;Ibrrahim et al 2010;Pereira et al 2011;Morgado and f Frollini 2011). The figures d through e represent SEM micrographs of MCC from Musa species, which revealed that during acid treatment, cellulose chains were degraded by the hydrolysis of the glycosidic bonds, leading to shortening of fiber length and formation of mixtures of non-aggregated spherical, rod-shaped, and thread-like microcrystalline cellulose.…”
Section: Morphological Study Of MCCmentioning
confidence: 98%
“…It was found that the pattern of CtF exhibited two strong diffraction peaks in the large-angle region (2u = 22 ); this could be assigned to cellulose II and in the small-angle region (2u = 15.5 ); this was assignable to cellulose I (Fig. 3a) [8][9][10]. However, the XRD profile of M-CtF(40) exhibited a strong diffraction peak in the large-angle region (2u = 22 ) and weak diffraction peak in the small-angle region (2u = 15.5 ) (Fig.…”
Section: Resultsmentioning
confidence: 98%