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 | Acesso ao texto completo restrito à biblioteca da Embrapa Amazônia Oriental. Para informações adicionais entre em contato com cpatu.biblioteca@embrapa.br. |
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Registro Completo |
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Biblioteca(s): |
Embrapa Amazônia Oriental. |
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Data corrente: |
06/12/2011 |
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Data da última atualização: |
11/11/2022 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
ALVES, T. V. G.; TAVARES, E. J. M.; AOUADA, F. A.; NEGRÃO, C. A. B.; OLIVEIRA, M. E. C.; DUARTE JÚNIOR, A. P.; COSTA, C. E. F. da; SILVA JÚNIOR, J. O. C.; COSTA, R. M. R. |
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Afiliação: |
TAÍS VANESSA AGBBAY ALVES, UFPA; ERALDO JOSE MADUREIRA TAVARES, CPATU; FAUZE AHMAD AOUADA, USP; CHALES ALBERTO BRITO NEGRÃO, UFPA; MARCOS ENE CHAVES OLIVEIRA, USP / CPATU; ANIVALDO PEREIRA DUARTE JÚNIOR, UFPA; CARLOS EMMERSON FERREIRA DA COSTA, UFPA; JOSÉ OTÁVIO CARRÉRA SILVA JUNIOR, UFPA; ROSEANE MARIA RIBEIRO COSTA, UFPA. |
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Título: |
Thermal analysis characterization of PAAm-co-MC hydrogels. |
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Ano de publicação: |
2011 |
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Fonte/Imprenta: |
Journal of Thermal Analysis and Calorimetry, v. 106, n. 3, p. 717-724, 2011. |
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DOI: |
10.1007/s10973-011-1572-z |
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Idioma: |
Inglês |
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Conteúdo: |
This paper reports the thermal characterization of polyacrylamide-co-methylcellulose hydrogels and the constituent monomers (acrylamide and methylcellulose). Polymeric materials can be used to produce hydrogels, which can be natural, synthetic, or a mixture. The hydrogels described here were obtained by free radical polymerization, in the presence of N,N0-methylene-bisacrylamide as a cross-linker agent. Four acrylamide concentrations were used for the synthesis of hydrogels: 3.6, 7.2, 14.7, and 21.7% (w/v). The materials so obtained were analyzed by TG, DTG, DSC, and FT-IR. The TG curves of acrylamide and methylcellulose showed three mass loss events. In DSC curves, the acrylamide exhibited one melting peak at 84.5 C, and methylcellulose indicated one exothermic event. Nevertheless, acrylamide was considered more stable than methylcellulose. The TG curves of the hydrogels exhibited three mass loss events, and on the DSC curves, three endothermic events were observed. It was verified that the different acrylamide proportions influenced the thermic behavior of hydrogels, and that the authors considered the 7.2% hydrogel a promising drug carrier system. The absorption bands were well defined, confirming the presence of the functional groups in the samples. |
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Palavras-Chave: |
Análise térmica; Hidrogel. |
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Categoria do assunto: |
W Química e Física |
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Marc: |
LEADER 02040naa a2200253 a 4500
001 1908634
005 2022-11-11
008 2011 bl uuuu u00u1 u #d
024 7 $a10.1007/s10973-011-1572-z$2DOI
100 1 $aALVES, T. V. G.
245 $aThermal analysis characterization of PAAm-co-MC hydrogels.$h[electronic resource]
260 $c2011
520 $aThis paper reports the thermal characterization of polyacrylamide-co-methylcellulose hydrogels and the constituent monomers (acrylamide and methylcellulose). Polymeric materials can be used to produce hydrogels, which can be natural, synthetic, or a mixture. The hydrogels described here were obtained by free radical polymerization, in the presence of N,N0-methylene-bisacrylamide as a cross-linker agent. Four acrylamide concentrations were used for the synthesis of hydrogels: 3.6, 7.2, 14.7, and 21.7% (w/v). The materials so obtained were analyzed by TG, DTG, DSC, and FT-IR. The TG curves of acrylamide and methylcellulose showed three mass loss events. In DSC curves, the acrylamide exhibited one melting peak at 84.5 C, and methylcellulose indicated one exothermic event. Nevertheless, acrylamide was considered more stable than methylcellulose. The TG curves of the hydrogels exhibited three mass loss events, and on the DSC curves, three endothermic events were observed. It was verified that the different acrylamide proportions influenced the thermic behavior of hydrogels, and that the authors considered the 7.2% hydrogel a promising drug carrier system. The absorption bands were well defined, confirming the presence of the functional groups in the samples.
653 $aAnálise térmica
653 $aHidrogel
700 1 $aTAVARES, E. J. M.
700 1 $aAOUADA, F. A.
700 1 $aNEGRÃO, C. A. B.
700 1 $aOLIVEIRA, M. E. C.
700 1 $aDUARTE JÚNIOR, A. P.
700 1 $aCOSTA, C. E. F. da
700 1 $aSILVA JÚNIOR, J. O. C.
700 1 $aCOSTA, R. M. R.
773 $tJournal of Thermal Analysis and Calorimetry$gv. 106, n. 3, p. 717-724, 2011.
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Registro original: |
Embrapa Amazônia Oriental (CPATU) |
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Tipo/Formato |
Classificação |
Cutter |
Registro |
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URL |
Voltar
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| Acesso ao texto completo restrito à biblioteca da Embrapa Clima Temperado. Para informações adicionais entre em contato com cpact.biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Clima Temperado. |
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Data corrente: |
03/03/2020 |
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Data da última atualização: |
08/06/2020 |
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Tipo da produção científica: |
Capítulo em Livro Técnico-Científico |
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Autoria: |
PEREIRA, I. dos S.; BAMBERG, A. L.; SILVEIRA, C. A. P.; ANTUNES, L. E. C.; SOUSA, R. O. de. |
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Afiliação: |
Ivan dos Santos Pereira; ADILSON LUIS BAMBERG, CPACT; CARLOS AUGUSTO POSSER SILVEIRA, CPACT; LUIS EDUARDO CORREA ANTUNES, CPACT; Rogério Oliveira de Sousa. |
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Título: |
Nitrogen Fertilization in Blackberry. |
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Ano de publicação: |
2019 |
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Fonte/Imprenta: |
In: RIGOBELO, E.; SERRA, A. (Ed.). Nitrogen Fixation. [s.l.]: IntechOpen, 2019. |
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Páginas: |
p. 11 |
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DOI: |
10.5772/intechopen.82409 |
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Idioma: |
Inglês |
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Palavras-Chave: |
Cultivar differences; Fertilization recommendation; Nutritional deficiency; Nutritional requirements; Rubus spp. |
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Thesagro: |
Amora. |
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Thesaurus NAL: |
Soil organic matter. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 00797naa a2200265 a 4500
001 2120827
005 2020-06-08
008 2019 bl uuuu u00u1 u #d
024 7 $a10.5772/intechopen.82409$2DOI
100 1 $aPEREIRA, I. dos S.
245 $aNitrogen Fertilization in Blackberry.$h[electronic resource]
260 $c2019
300 $ap. 11
650 $aSoil organic matter
650 $aAmora
653 $aCultivar differences
653 $aFertilization recommendation
653 $aNutritional deficiency
653 $aNutritional requirements
653 $aRubus spp
700 1 $aBAMBERG, A. L.
700 1 $aSILVEIRA, C. A. P.
700 1 $aANTUNES, L. E. C.
700 1 $aSOUSA, R. O. de
773 $tIn: RIGOBELO, E.; SERRA, A. (Ed.). Nitrogen Fixation. [s.l.]: IntechOpen, 2019.
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