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Materials produced from plant biomass. Part II : evaluation of crystallinity and degradation kinetics of cellulose

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Materials produced from plant biomass. Part II : evaluation of crystallinity and degradation kinetics of cellulose

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Título Materials produced from plant biomass. Part II : evaluation of crystallinity and degradation kinetics of cellulose
Autor Poletto, Matheus
Pistor, Vinicius
Santana, Ruth Marlene Campomanes
Zattera, Ademir José
Abstract In this study Eucalyptus grandis (CEG) and Pinus taeda (CPT) cellulose fibers obtained from kraft and sulfite pulping process, respectively, were characterized using Fourier transform infrared (FTIR) spectroscopy and thermogravimetry (TGA). The degradation kinetic parameters were determined by TGA using Coats and Redfern method. FTIR results showed that CPT presented a more ordered structure with higher crystallinity than CEG. Thermogravimetric results showed that CPT had a higher thermal stability than CEG. The kinetic results revel that for CEG the degradation mechanism occurs mainly by random nucleation, although phase boundary controlled reactions also occurs while for CPT the degradation process is more related with phase boundary controlled reactions. Results demonstrated that differences between thermal stability and degradation mechanisms might be associated with differences in the cellulose crystalline structure probably caused by different pulping processes used for obtaining the cellulose fibers.
Contido em Materials research : ibero-american journal of materials [recurso eletrônico]. São Carlos, SP. vol. 15, no. 3 (May/June 2012), p. 421-427.
Assunto Biomassa
Celulose
[en] Cellulose
[en] Crystallinity
[en] Eucalyptus grandis
[en] FTIR spectroscopy
[en] Pinus taeda
[en] Thermal degradation
Origem Nacional
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/75885
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