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DC Field | Value | Language |
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dc.contributor.author | Barud, Hernani S. | - |
dc.contributor.author | Ribeiro, Clovis Augusto | - |
dc.contributor.author | Capela, Jorge Manual Vieira | - |
dc.contributor.author | Crespi, Marisa Spirandeli | - |
dc.contributor.author | Ribeiro, Sidney José Lima | - |
dc.contributor.author | Messadeq, Younes | - |
dc.date.accessioned | 2014-05-20T14:19:21Z | - |
dc.date.accessioned | 2016-10-25T17:41:02Z | - |
dc.date.available | 2014-05-20T14:19:21Z | - |
dc.date.available | 2016-10-25T17:41:02Z | - |
dc.date.issued | 2011-08-01 | - |
dc.identifier | http://dx.doi.org/10.1007/s10973-010-1118-9 | - |
dc.identifier.citation | Journal of Thermal Analysis and Calorimetry. Dordrecht: Springer, v. 105, n. 2, p. 421-426, 2011. | - |
dc.identifier.issn | 1388-6150 | - |
dc.identifier.uri | http://hdl.handle.net/11449/25837 | - |
dc.identifier.uri | http://acervodigital.unesp.br/handle/11449/25837 | - |
dc.description.abstract | Cellulose can be obtained from innumerable sources such as cotton, trees, sugar cane bagasse, wood, bacteria, and others. The bacterial cellulose (BC) produced by the Gram-negative acetic-acid bacterium Acetobacter xylinum has several unique properties. This BC is produced as highly hydrated membranes free of lignin and hemicelluloses and has a higher molecular weight and higher crystallinity. Here, the thermal behavior of BC, was compared with those of microcrystalline (MMC) and vegetal cellulose (VC). The kinetic parameters for the thermal decomposition step of the celluloses were determined by the Capela-Ribeiro non-linear isoconversional method. From data for the TG curves in nitrogen atmosphere and at heating rates of 5, 10, and 20 A degrees C/min, the E(alpha) and B(alpha) terms could be determined and consequently the pre-exponential factor A(alpha) as well as the kinetic model g(alpha). The pyrolysis of celluloses followed kinetic model g(alpha) = [-ln(1 - alpha)](1.63) on average, characteristic for Avrami-Erofeev with only small differences in activation energy. The fractional value of n may be related to diffusion-controlled growth, or may arise from the distributions of sizes or shapes of the reactant particles. | en |
dc.format.extent | 421-426 | - |
dc.language.iso | eng | - |
dc.publisher | Springer | - |
dc.source | Web of Science | - |
dc.subject | Bacterial cellulose | en |
dc.subject | Non-isothermal kinetic | en |
dc.subject | Thermal decomposition | en |
dc.title | Kinetic parameters for thermal decomposition of microcrystalline, vegetal, and bacterial cellulose | en |
dc.type | outro | - |
dc.contributor.institution | Universidade Estadual Paulista (UNESP) | - |
dc.description.affiliation | Araraquara Paulista State Univ, Inst Chem, BR-14800900 São Paulo, Brazil | - |
dc.description.affiliationUnesp | Araraquara Paulista State Univ, Inst Chem, BR-14800900 São Paulo, Brazil | - |
dc.identifier.doi | 10.1007/s10973-010-1118-9 | - |
dc.identifier.wos | WOS:000293213000006 | - |
dc.rights.accessRights | Acesso restrito | - |
dc.relation.ispartof | Journal of Thermal Analysis and Calorimetry | - |
dc.identifier.orcid | 0000-0002-7984-5908 | pt |
Appears in Collections: | Artigos, TCCs, Teses e Dissertações da Unesp |
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