A comparative study of the non-isothermal degradation of natural rubber from Mangabeira (Hancornia speciosa Gomes) and Seringueira (Hevea brasiliensis)

Medeiros, Eliton S.; Galiani, Patrini D.; Moreno, R. M. B.; Mattoso, Luiz H. C.; Malmonge, José Antônio

doi:10.1007/s10973-009-0477-6

Cited by 16 publications

(16 citation statements)

References 16 publications

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“…In order to obtain the kinetic parameters of polymer degradation, thermogravimetric curves were analyzed according to Flynn-Wall-Ozawa's approach using the methodology described in our previous works on rubber decomposition [12] . Briefly, when a polymeric material undergoes thermal decomposition according to the reaction ( , if the decomposition starts at a temperature (T 0 ) and is carried out at a linear increasing in temperature (T=T 0 +βt), where β is the constant heating rate ( dT dt β = ), the thermal decomposition events can be described by the following expression [13][14][15][16] :…”

Section: Flinn-wall-ozawa's Approachmentioning

confidence: 99%

“…Thermal analysis of conducting polymers is of great interest to determine their thermal behavior in various technological applications, since it provides important information on the effect of morphological and structural changes such as cross-linking and functionalization. This method has been largely used in the study of curing and degradation of polymers and decomposition of several other substances [12][13][14][15][16][17] . Improvements in the determination of the kinetic triplet -activation energy, pre-exponential factor and order of rection -has been proposed by several other authors, including more accurate solutions for the the temperature integral.…”

Section: Introductionmentioning

confidence: 99%

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Non-isothermal decomposition kinetics of conductive polyaniline and its derivatives

et al. 2018

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ObstractThe non-isothermal decomposition kinetics of conductive polyaniline (PANI) and its derivatives, poly(o-methoxyaniline) (POMA) and poly(o-ethoxyaniline) (POEA), was investigated by thermogravimetric analysis (TGA), under inert and oxidative atmospheres, using Flynn-Wall-Ozawa's approach to assess the kinetic parameters of the decomposition process. The order of reaction was found to be dependent on the degree of conversion indicating that both the early and the later stages of polymer degradation were next the zero or pseudo zero order kinetics, whereas the intermediate stages follow a first order kinetics. The activation energy was found to be dependent on both the degree of conversion and PANI derivative. Activation energy values vary from 125 to 250 kJ/mol, to decompositions carried out under nitrogen, and 75 to 120 kJ/mol to oxidative atmosphere. Parent PANI presented the best thermal stability and suggesting that thermal stability is also influenced by derivatization and type of atmosphere used.In this work, polyaniline (PANI) and its derivatives, poly(o-metoxyaniline), POMA, and poly(etoxyaniline), POEA, were analyzed by thermogravimetric analysis (TGA) and their kinetics of thermal decomposition was studied by Flynn-Wall-Ozawa's approach to access the kinetics triplet (activation energy, pre-exponential factor and order of reaction) in order to compare the thermal behavior of PANI with its POEA and POMA derivatives.

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Section: Flinn-wall-ozawa's Approachmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Non-isothermal decomposition kinetics of conductive polyaniline and its derivatives

et al. 2018

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“…Müll.Arg.). Ambos estudos compararam as propriedades da borracha obtidas da mangabeira e da seringueira, um de maneira mais geral (Malmonge et al 2009), outro, avaliando especificamente a degradação não isotérmica da borracha natural obtida de ambas espécies (Medeiros et al 2010). …”

Section: Ciências Agráriasunclassified

Coletânea bibliográfica acadêmica sobre a mangabeira (Hancornia speciosa Gomes)

Oliveira

Cruz

Freitas

et al. 2017

G. Sci.

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resumo -A mangabeira (Hancornia speciosa Gomes) é uma árvore nativa do Brasil, cujo fruto é obtido predominantemente de forma extrativista e apreciado tanto in natura quanto na forma de polpas, geleias, doces. As raízes, cascas e látex possuem uso medicinal e sua madeira é usada como combustível. Ocorre do Nordeste até os Cerrados das regiões Centro-Oeste, Norte e Sudeste. Entende-se que estudos científicos sobre espécies nativas de base extrativista são essenciais a fim de subsidiar estratégias para a conservação da espécie. O presente trabalho objetivou analisar as publicações acadêmicas sobre a mangabeira disponíveis na plataforma de periódicos da Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (Capes), utilizando os princípios da bibliometria. As buscas aconteceram por meio das palavras chave: "mangaba", "mangabeira" e "Hancornia speciosa Gomes", o que resultou em 103 publicações sobre a espécie. Essas publicações foram classificadas de acordo com o ano, o tipo e o periódico de publicação; e, de acordo com o seu conteúdo, enquadradas nas áreas de conhecimento estabelecidas pela Capes. Após o enquadramento verificou-se que 40,8% das pesquisas estão relacionadas às Ciências Biológicas, 19,4% às Ciências de Alimentos, 13,6% às Ciências Agrárias, 10,7% às Ciências da Saúde, 7,8% às Ciências Multidisciplinares e 1,9% às Ciências Sociais Aplicadas. Constatou-se que há poucos estudos sobre aspectos socioeconômicos, ecológicos e culturais, o que indica a necessidade de mais estudos sob esses enfoques para subsidiar estratégias para a conservação da espécie. Palavras-Chave: Mangaba; periódicos; biblioMetria; sustentabilidade.ComPilation aCademiC literature on mangabeira (Hancornia speciosa gomes) abstraCt -The mangabeira (Hancornia speciosa Gomes) is a tree native to Brazil, whose fruit is obtained predominantly extractive way e appreciated both in nature e in the form of pulps, jellies, jams, etc. Their roots, bark e latex have medicinal uses e its wood is used as fuel. Is the Northeast to the Cerrado of the Center-West, North e East of the country. It is understood that scientific studies of native species of extractive base are essential in order to support strategies for the conservation of the species.

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“…The technological properties of the mangabeira latex are quite similar to those of H. brasiliensis (Malmonge et al, 2008). Mangabeira latex has a lower protein content than Hevea, a fact that suggests its latex may have important application in situations requiring the use of anti-allergenic rubber (Medeiros et al, 2010).…”

Section: Mangaba Latex: Technological and Pharmacological Propertiesmentioning

confidence: 99%

Uses and technological prospects for the mangaba, a native fruit of Brazil

Silva¹,

Soares²,

Lédo³

et al. 2017

Afr. J. Biotechnol.

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Mangaba (Hancornia speciosa Gomes -Apocynaceae) is a native fruit of Brazil which is of great importance in its areas of occurrence. This species has been subjected to habitat fragmentation that is mainly due to human activity, and requires conservation. The aim of the present review was to evaluate the biotechnological advances in the species. This paper deals with recent studies on the genetic diversity and bioactive compounds.

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A comparative study of the non-isothermal degradation of natural rubber from Mangabeira (Hancornia speciosa Gomes) and Seringueira (Hevea brasiliensis)

Cited by 16 publications

References 16 publications

Non-isothermal decomposition kinetics of conductive polyaniline and its derivatives

Non-isothermal decomposition kinetics of conductive polyaniline and its derivatives

Coletânea bibliográfica acadêmica sobre a mangabeira (Hancornia speciosa Gomes)

Uses and technological prospects for the mangaba, a native fruit of Brazil

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