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Registro Completo |
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Biblioteca(s): |
Embrapa Agroenergia. |
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Data corrente: |
24/11/2020 |
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Data da última atualização: |
24/11/2020 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
BARROSO, R. G. M. R.; GONCALVES, S. B.; MACHADO, F. |
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Afiliação: |
Raissa Gabriela M. Reis Barroso, Universidade de Brasília; SILVIA BELEM GONCALVES, CNPAE; Fabricio Machado, Universidade de Brasília. |
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Título: |
A novel approach for the synthesis of lactic acid-based polymers in an aqueous dispersed medium. |
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Ano de publicação: |
2020 |
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Fonte/Imprenta: |
Sustainable Chemistry and Pharmacy, v. 15, 100211, Mar. 2020. |
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DOI: |
https://doi.org/10.1016/j.scp.2019.100211 |
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Idioma: |
Inglês |
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Conteúdo: |
In recent years, the search for environmentally friendly monomers has gradually increased as an important field, attracting the attention of researchers worldwide. Our approach to obtaining lactic acid-based polymers entails the use of an environmentally friendly monomer, derived from lactic acid (ELA), presenting double-bond functionality, allowing it to undergo free-radical polymerization, while further having an eco-friendly water-based miniemulsion polymerization process. It has been demonstrated that the ELA/methyl methacrylate (MMA) copolymer can successfully be synthesized. Highly stable latexes were obtained at high conversion. The incorporation of ELA and its effect on the copolymer properties were evaluated; results indicated that polymer properties such as average molar masses and glass transition temperatures are strongly dependent on the ELA composition. |
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Palavras-Chave: |
Ecofriendly latex; ELA; MMA. |
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Thesagro: |
Ácido Lático; Agricultura Sustentável; Desenvolvimento Sustentável; Latex; Metil. |
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Thesaurus Nal: |
Environmental sustainability; Lactic acid; Methylmethacrylate; Polymerization; Sustainable agriculture. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/218184/1/A-novel-approach-for-the-synthesis-2020.pdf
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Marc: |
LEADER 01828naa a2200313 a 4500
001 2127013
005 2020-11-24
008 2020 bl uuuu u00u1 u #d
024 7 $ahttps://doi.org/10.1016/j.scp.2019.100211$2DOI
100 1 $aBARROSO, R. G. M. R.
245 $aA novel approach for the synthesis of lactic acid-based polymers in an aqueous dispersed medium.$h[electronic resource]
260 $c2020
520 $aIn recent years, the search for environmentally friendly monomers has gradually increased as an important field, attracting the attention of researchers worldwide. Our approach to obtaining lactic acid-based polymers entails the use of an environmentally friendly monomer, derived from lactic acid (ELA), presenting double-bond functionality, allowing it to undergo free-radical polymerization, while further having an eco-friendly water-based miniemulsion polymerization process. It has been demonstrated that the ELA/methyl methacrylate (MMA) copolymer can successfully be synthesized. Highly stable latexes were obtained at high conversion. The incorporation of ELA and its effect on the copolymer properties were evaluated; results indicated that polymer properties such as average molar masses and glass transition temperatures are strongly dependent on the ELA composition.
650 $aEnvironmental sustainability
650 $aLactic acid
650 $aMethylmethacrylate
650 $aPolymerization
650 $aSustainable agriculture
650 $aÁcido Lático
650 $aAgricultura Sustentável
650 $aDesenvolvimento Sustentável
650 $aLatex
650 $aMetil
653 $aEcofriendly latex
653 $aELA
653 $aMMA
700 1 $aGONCALVES, S. B.
700 1 $aMACHADO, F.
773 $tSustainable Chemistry and Pharmacy$gv. 15, 100211, Mar. 2020.
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Registro original: |
Embrapa Agroenergia (CNPAE) |
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Registro Completo
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Biblioteca(s): |
Embrapa Florestas. |
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Data corrente: |
29/03/2001 |
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Data da última atualização: |
08/04/2015 |
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Autoria: |
OLIVEIRA, Y. M. M. de. |
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Afiliação: |
Pesquisadora da Embrapa Florestas. |
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Título: |
Investigation of remote sensing for assessing and monitoring the Araucaria Forest Region of Brazil. |
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Ano de publicação: |
1999 |
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Fonte/Imprenta: |
1999. |
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Páginas: |
247 f. |
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Idioma: |
Inglês |
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Notas: |
Doctor (Philosophy Thesis) - University of Oxford, Oxford. |
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Conteúdo: |
Southern Brazil has experienced a rapid deterioration of its forest during the last century, mainly due to the impacts of exploitative land use practices. Mixed Ombrophilous forest with Araucaria angustifolia (Bertoloni) O. Kuntze (Veloso and Goes-Filho), is typically dominated by the species Araucaria angustifolia, also known as parana-pine. Although the species is predominant, Araucaria forest also supports a complex, variable and regional ecosystem composed of many species, some of which are endemic to this forest type. The present study focused on an area of the Araucaria forest biome located within the first plateau of Parana Slate. It includes the Irati National Forest (INF), the only protected area with Araucaria forest in Paran Slate. The main goal of the thesis was to determine the relationship between vegetation and satellite remote sensing for assessing and monitoring Araucaria forest and ecosystems associated with the Araucaria forest region. The reflective properties and spectral signatures of the four main forest types in the INF (Araucaria forest, Araucaria angustifolia plantation, Pinus elliottii plantation and Pinus taeda plantation) were analysed and characterised. It was noted that spectral responses of A. angustifolia plantation and P. taeda plantation are similar. Standard Principal Component Analysis (PCA) revealed that the spectral data space could be reduced to three eingenvectors. The discrimination of A. angustifolia was achieved using the second component of the PCA using near infrared and mid infrared wavebands. Linear Mixing Modelling was undertaken to detect and identify A. angustifolia at sub-pixel level. The shade image was sensitive to forestry structure (density) and species differentiation. Use of the Normalised Difference Vegetation Index was successful in the biomass change detection using image differencing process, resulting in a proposed alternative monitoring system to detect forest changes in the Araucaria forest region. MenosSouthern Brazil has experienced a rapid deterioration of its forest during the last century, mainly due to the impacts of exploitative land use practices. Mixed Ombrophilous forest with Araucaria angustifolia (Bertoloni) O. Kuntze (Veloso and Goes-Filho), is typically dominated by the species Araucaria angustifolia, also known as parana-pine. Although the species is predominant, Araucaria forest also supports a complex, variable and regional ecosystem composed of many species, some of which are endemic to this forest type. The present study focused on an area of the Araucaria forest biome located within the first plateau of Parana Slate. It includes the Irati National Forest (INF), the only protected area with Araucaria forest in Paran Slate. The main goal of the thesis was to determine the relationship between vegetation and satellite remote sensing for assessing and monitoring Araucaria forest and ecosystems associated with the Araucaria forest region. The reflective properties and spectral signatures of the four main forest types in the INF (Araucaria forest, Araucaria angustifolia plantation, Pinus elliottii plantation and Pinus taeda plantation) were analysed and characterised. It was noted that spectral responses of A. angustifolia plantation and P. taeda plantation are similar. Standard Principal Component Analysis (PCA) revealed that the spectral data space could be reduced to three eingenvectors. The discrimination of A. angustifolia was achieved using the second co... Mostrar Tudo |
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Palavras-Chave: |
Brasil; Forest; Monitoramento; Paraná. |
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Thesagro: |
Araucária; Araucária Angustifólia; Espécie Nativa; Floresta; Sensoriamento Remoto. |
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Thesaurus NAL: |
Brazil; monitoring; remote sensing. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/121961/1/Yeda.pdf
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Marc: |
LEADER 02758nam a2200277 a 4500
001 1308307
005 2015-04-08
008 1999 bl uuuu m 00u1 u #d
100 1 $aOLIVEIRA, Y. M. M. de
245 $aInvestigation of remote sensing for assessing and monitoring the Araucaria Forest Region of Brazil.
260 $a1999.$c1999
300 $a247 f.
500 $aDoctor (Philosophy Thesis) - University of Oxford, Oxford.
520 $aSouthern Brazil has experienced a rapid deterioration of its forest during the last century, mainly due to the impacts of exploitative land use practices. Mixed Ombrophilous forest with Araucaria angustifolia (Bertoloni) O. Kuntze (Veloso and Goes-Filho), is typically dominated by the species Araucaria angustifolia, also known as parana-pine. Although the species is predominant, Araucaria forest also supports a complex, variable and regional ecosystem composed of many species, some of which are endemic to this forest type. The present study focused on an area of the Araucaria forest biome located within the first plateau of Parana Slate. It includes the Irati National Forest (INF), the only protected area with Araucaria forest in Paran Slate. The main goal of the thesis was to determine the relationship between vegetation and satellite remote sensing for assessing and monitoring Araucaria forest and ecosystems associated with the Araucaria forest region. The reflective properties and spectral signatures of the four main forest types in the INF (Araucaria forest, Araucaria angustifolia plantation, Pinus elliottii plantation and Pinus taeda plantation) were analysed and characterised. It was noted that spectral responses of A. angustifolia plantation and P. taeda plantation are similar. Standard Principal Component Analysis (PCA) revealed that the spectral data space could be reduced to three eingenvectors. The discrimination of A. angustifolia was achieved using the second component of the PCA using near infrared and mid infrared wavebands. Linear Mixing Modelling was undertaken to detect and identify A. angustifolia at sub-pixel level. The shade image was sensitive to forestry structure (density) and species differentiation. Use of the Normalised Difference Vegetation Index was successful in the biomass change detection using image differencing process, resulting in a proposed alternative monitoring system to detect forest changes in the Araucaria forest region.
650 $aBrazil
650 $amonitoring
650 $aremote sensing
650 $aAraucária
650 $aAraucária Angustifólia
650 $aEspécie Nativa
650 $aFloresta
650 $aSensoriamento Remoto
653 $aBrasil
653 $aForest
653 $aMonitoramento
653 $aParaná
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Registro original: |
Embrapa Florestas (CNPF) |
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