Synthesis and characterization of methylcellulose produced from bacterial cellulose under heterogeneous condition
In this work, methylcellulose (MC) was produced from bacterial cellulose (BC), using dimethyl sulfate in a 3 h (MC3h) or 5 h (MC5h) reaction under heterogeneous conditions, with reagent substitution at each hour. MC3h showed a degree of substitution (DS) of 2.26 ± 0.13 and MC5h showed a DS of 2.33 ±...
| Autores: | , , , , , , |
|---|---|
| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2015 |
| País: | Brasil |
| Institución: | Universidade Estadual Paulista (UNESP) |
| Repositorio: | Repositório Institucional da UNESP |
| Idioma: | inglés |
| OAI Identifier: | oai:repositorio.unesp.br:11449/177488 |
| Acceso en línea: | http://dx.doi.org/10.5935/0103-5053.20150163 http://hdl.handle.net/11449/177488 |
| Access Level: | acceso abierto |
| Palabra clave: | Bacterial cellulose Cellulose derivatives FTIR Methylcellulose NMR spectroscopy TGA/DTA |
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Synthesis and characterization of methylcellulose produced from bacterial cellulose under heterogeneous conditionBacterial celluloseCellulose derivativesFTIRMethylcelluloseNMR spectroscopyTGA/DTAIn this work, methylcellulose (MC) was produced from bacterial cellulose (BC), using dimethyl sulfate in a 3 h (MC3h) or 5 h (MC5h) reaction under heterogeneous conditions, with reagent substitution at each hour. MC3h showed a degree of substitution (DS) of 2.26 ± 0.13 and MC5h showed a DS of 2.33 ± 0.05. The two samples were characterized by Fourier transform infrared spectroscopy (FTIR), X-ray powder diffraction (XRD), differential thermal analysis (DTA), thermal gravimetric analysis (TGA), <sup>13</sup>C nuclear magnetic ressonance (NMR) and <sup>1</sup>H NMR techniques. The FTIR spectra of the BC and MC samples present significant differences in the regions from 3750 to 2750 cm<sup>-1</sup> and from 1500 to 750 cm<sup>-1</sup>, which evidence the methylation of the samples. Solid state NMR spectroscopy of the MC samples was used to identify the <sup>13</sup>C NMR signals of substitution at sites C-2, C-3 or C-6 in the glucopyranose units. The modification of bacterial cellulose produced a material with a high DS, determined by three different techniques (chemically and using the liquid <sup>1</sup>H and solid <sup>13</sup>C NMR spectra). These samples also demonstrate high crystallinity and thermal stability. With the MC samples synthesized in this work, transparent and resistant films were prepared and also a highly porous sponge like material.Instituto de Química, Universidade Estadual Paulista Júlio de Mesquita Filho (UNESP)Instituto de Química, Universidade Federal de UberlândiaFaculdade de Ciências Integradas, Universidade Federal de UberlândiaInstituto de Química, Universidade Estadual Paulista Júlio de Mesquita Filho (UNESP)Universidade Estadual Paulista (Unesp)Universidade Federal de Uberlândia (UFU)2018-12-11T17:25:43Z2018-12-11T17:25:43Z2015-09-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article1861-1870application/pdfhttp://dx.doi.org/10.5935/0103-5053.20150163Journal of the Brazilian Chemical Society, v. 26, n. 9, p. 1861-1870, 2015.1678-47900103-5053http://hdl.handle.net/11449/17748810.5935/0103-5053.20150163S0103-505320150009018612-s2.0-84941557745S0103-50532015000901861.pdfScopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengJournal of the Brazilian Chemical Society0,3570,357info:eu-repo/semantics/openAccessOliveira, Rafael L. [UNESP]Vieira, Júlia G.Barud, Hernane S. [UNESP]Assunção, Rosana M. N.Filho, Guimes R.Ribeiro, Sidney J. L. [UNESP]Messadeqq, Younes [UNESP]2025-05-28T05:05:18Zoai:repositorio.unesp.br:11449/177488Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestrepositoriounesp@unesp.bropendoar:29462025-05-28T05:05:18Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
| dc.title.none.fl_str_mv |
Synthesis and characterization of methylcellulose produced from bacterial cellulose under heterogeneous condition |
| title |
Synthesis and characterization of methylcellulose produced from bacterial cellulose under heterogeneous condition |
| spellingShingle |
Synthesis and characterization of methylcellulose produced from bacterial cellulose under heterogeneous condition Oliveira, Rafael L. [UNESP] Bacterial cellulose Cellulose derivatives FTIR Methylcellulose NMR spectroscopy TGA/DTA |
| title_short |
Synthesis and characterization of methylcellulose produced from bacterial cellulose under heterogeneous condition |
| title_full |
Synthesis and characterization of methylcellulose produced from bacterial cellulose under heterogeneous condition |
| title_fullStr |
Synthesis and characterization of methylcellulose produced from bacterial cellulose under heterogeneous condition |
| title_full_unstemmed |
Synthesis and characterization of methylcellulose produced from bacterial cellulose under heterogeneous condition |
| title_sort |
Synthesis and characterization of methylcellulose produced from bacterial cellulose under heterogeneous condition |
| dc.creator.none.fl_str_mv |
Oliveira, Rafael L. [UNESP] Vieira, Júlia G. Barud, Hernane S. [UNESP] Assunção, Rosana M. N. Filho, Guimes R. Ribeiro, Sidney J. L. [UNESP] Messadeqq, Younes [UNESP] |
| author |
Oliveira, Rafael L. [UNESP] |
| author_facet |
Oliveira, Rafael L. [UNESP] Vieira, Júlia G. Barud, Hernane S. [UNESP] Assunção, Rosana M. N. Filho, Guimes R. Ribeiro, Sidney J. L. [UNESP] Messadeqq, Younes [UNESP] |
| author_role |
author |
| author2 |
Vieira, Júlia G. Barud, Hernane S. [UNESP] Assunção, Rosana M. N. Filho, Guimes R. Ribeiro, Sidney J. L. [UNESP] Messadeqq, Younes [UNESP] |
| author2_role |
author author author author author author |
| dc.contributor.none.fl_str_mv |
Universidade Estadual Paulista (Unesp) Universidade Federal de Uberlândia (UFU) |
| dc.subject.por.fl_str_mv |
Bacterial cellulose Cellulose derivatives FTIR Methylcellulose NMR spectroscopy TGA/DTA |
| topic |
Bacterial cellulose Cellulose derivatives FTIR Methylcellulose NMR spectroscopy TGA/DTA |
| description |
In this work, methylcellulose (MC) was produced from bacterial cellulose (BC), using dimethyl sulfate in a 3 h (MC3h) or 5 h (MC5h) reaction under heterogeneous conditions, with reagent substitution at each hour. MC3h showed a degree of substitution (DS) of 2.26 ± 0.13 and MC5h showed a DS of 2.33 ± 0.05. The two samples were characterized by Fourier transform infrared spectroscopy (FTIR), X-ray powder diffraction (XRD), differential thermal analysis (DTA), thermal gravimetric analysis (TGA), <sup>13</sup>C nuclear magnetic ressonance (NMR) and <sup>1</sup>H NMR techniques. The FTIR spectra of the BC and MC samples present significant differences in the regions from 3750 to 2750 cm<sup>-1</sup> and from 1500 to 750 cm<sup>-1</sup>, which evidence the methylation of the samples. Solid state NMR spectroscopy of the MC samples was used to identify the <sup>13</sup>C NMR signals of substitution at sites C-2, C-3 or C-6 in the glucopyranose units. The modification of bacterial cellulose produced a material with a high DS, determined by three different techniques (chemically and using the liquid <sup>1</sup>H and solid <sup>13</sup>C NMR spectra). These samples also demonstrate high crystallinity and thermal stability. With the MC samples synthesized in this work, transparent and resistant films were prepared and also a highly porous sponge like material. |
| publishDate |
2015 |
| dc.date.none.fl_str_mv |
2015-09-01 2018-12-11T17:25:43Z 2018-12-11T17:25:43Z |
| dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
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info:eu-repo/semantics/article |
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article |
| status_str |
publishedVersion |
| dc.identifier.uri.fl_str_mv |
http://dx.doi.org/10.5935/0103-5053.20150163 Journal of the Brazilian Chemical Society, v. 26, n. 9, p. 1861-1870, 2015. 1678-4790 0103-5053 http://hdl.handle.net/11449/177488 10.5935/0103-5053.20150163 S0103-50532015000901861 2-s2.0-84941557745 S0103-50532015000901861.pdf |
| url |
http://dx.doi.org/10.5935/0103-5053.20150163 http://hdl.handle.net/11449/177488 |
| identifier_str_mv |
Journal of the Brazilian Chemical Society, v. 26, n. 9, p. 1861-1870, 2015. 1678-4790 0103-5053 10.5935/0103-5053.20150163 S0103-50532015000901861 2-s2.0-84941557745 S0103-50532015000901861.pdf |
| dc.language.iso.fl_str_mv |
eng |
| language |
eng |
| dc.relation.none.fl_str_mv |
Journal of the Brazilian Chemical Society 0,357 0,357 |
| dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
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openAccess |
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1861-1870 application/pdf |
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Scopus reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
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Universidade Estadual Paulista (UNESP) |
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UNESP |
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UNESP |
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Repositório Institucional da UNESP |
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Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
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repositoriounesp@unesp.br |
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