Synthesis and Characterization of Methylcellulose Produced from Bacterial Cellulose under Heterogeneous Condition
Autor(a) principal: | |
---|---|
Data de Publicação: | 2015 |
Outros Autores: | , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Journal of the Brazilian Chemical Society (Online) |
Texto Completo: | http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532015000901861 |
Resumo: | 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), 13C nuclear magnetic ressonance (NMR) and 1H NMR techniques. The FTIR spectra of the BC and MC samples present significant differences in the regions from 3750 to 2750 cm−1 and from 1500 to 750 cm−1, which evidence the methylation of the samples. Solid state NMR spectroscopy of the MC samples was used to identify the 13C 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 1H and solid 13C 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. |
id |
SBQ-2_f7a705e14b38650ce5753e99cf609526 |
---|---|
oai_identifier_str |
oai:scielo:S0103-50532015000901861 |
network_acronym_str |
SBQ-2 |
network_name_str |
Journal of the Brazilian Chemical Society (Online) |
repository_id_str |
|
spelling |
Synthesis and Characterization of Methylcellulose Produced from Bacterial Cellulose under Heterogeneous Conditionbacterial cellulosecellulose derivativesmethylcelluloseFTIRTGA/DTANMR spectroscopyIn 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), 13C nuclear magnetic ressonance (NMR) and 1H NMR techniques. The FTIR spectra of the BC and MC samples present significant differences in the regions from 3750 to 2750 cm−1 and from 1500 to 750 cm−1, which evidence the methylation of the samples. Solid state NMR spectroscopy of the MC samples was used to identify the 13C 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 1H and solid 13C 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.Sociedade Brasileira de Química2015-09-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532015000901861Journal of the Brazilian Chemical Society v.26 n.9 2015reponame:Journal of the Brazilian Chemical Society (Online)instname:Sociedade Brasileira de Química (SBQ)instacron:SBQ10.5935/0103-5053.20150163info:eu-repo/semantics/openAccessOliveira,Rafael L.Vieira,Júlia G.Barud,Hernane S.Assunção,Rosana M. N.R. Filho,GuimesRibeiro,Sidney J. L.Messadeqq,Youneseng2015-09-11T00:00:00Zoai:scielo:S0103-50532015000901861Revistahttp://jbcs.sbq.org.brONGhttps://old.scielo.br/oai/scielo-oai.php||office@jbcs.sbq.org.br1678-47900103-5053opendoar:2015-09-11T00:00Journal of the Brazilian Chemical Society (Online) - Sociedade Brasileira de Química (SBQ)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. bacterial cellulose cellulose derivatives methylcellulose FTIR TGA/DTA NMR spectroscopy |
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 |
author |
Oliveira,Rafael L. |
author_facet |
Oliveira,Rafael L. Vieira,Júlia G. Barud,Hernane S. Assunção,Rosana M. N. R. Filho,Guimes Ribeiro,Sidney J. L. Messadeqq,Younes |
author_role |
author |
author2 |
Vieira,Júlia G. Barud,Hernane S. Assunção,Rosana M. N. R. Filho,Guimes Ribeiro,Sidney J. L. Messadeqq,Younes |
author2_role |
author author author author author author |
dc.contributor.author.fl_str_mv |
Oliveira,Rafael L. Vieira,Júlia G. Barud,Hernane S. Assunção,Rosana M. N. R. Filho,Guimes Ribeiro,Sidney J. L. Messadeqq,Younes |
dc.subject.por.fl_str_mv |
bacterial cellulose cellulose derivatives methylcellulose FTIR TGA/DTA NMR spectroscopy |
topic |
bacterial cellulose cellulose derivatives methylcellulose FTIR TGA/DTA NMR spectroscopy |
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), 13C nuclear magnetic ressonance (NMR) and 1H NMR techniques. The FTIR spectra of the BC and MC samples present significant differences in the regions from 3750 to 2750 cm−1 and from 1500 to 750 cm−1, which evidence the methylation of the samples. Solid state NMR spectroscopy of the MC samples was used to identify the 13C 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 1H and solid 13C 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 |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532015000901861 |
url |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532015000901861 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
10.5935/0103-5053.20150163 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
text/html |
dc.publisher.none.fl_str_mv |
Sociedade Brasileira de Química |
publisher.none.fl_str_mv |
Sociedade Brasileira de Química |
dc.source.none.fl_str_mv |
Journal of the Brazilian Chemical Society v.26 n.9 2015 reponame:Journal of the Brazilian Chemical Society (Online) instname:Sociedade Brasileira de Química (SBQ) instacron:SBQ |
instname_str |
Sociedade Brasileira de Química (SBQ) |
instacron_str |
SBQ |
institution |
SBQ |
reponame_str |
Journal of the Brazilian Chemical Society (Online) |
collection |
Journal of the Brazilian Chemical Society (Online) |
repository.name.fl_str_mv |
Journal of the Brazilian Chemical Society (Online) - Sociedade Brasileira de Química (SBQ) |
repository.mail.fl_str_mv |
||office@jbcs.sbq.org.br |
_version_ |
1750318177482440704 |