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

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Abstract

Due to the increasing search for alternative sources of natural rubber (NR) whose properties are similar to Hevea brasiliesis, several sources have been studied in the past few years. Among them, Mangabeira (Hancornia speciosa Gomes), which is native to Amazon rainforest and other regions of Brazil, has a potential as another viable rubber source. As a continuation of a series of comparative studies between Hancornia and Hevea (clone RRIM 600) these two species by our research team, their thermal behavior was analyzed by thermogravimetry (TG) using Flynn–Wall–Ozawa’s approach in order to obtain kinetic parameters (reaction order, pre-exponential factor and activation energy) of the decomposition process. Results indicated that the thermal behavior of NR from Hancornia was comparable to Hevea with some differences observed as follows: reaction order for Hancornia was higher than for Hevea at the beginning of degradation and very close for temperatures over 350 °C; activation energy and pre-exponential factor had the same trend, i.e., increased with increasing degree of conversion remaining almost constant between 20 and 70% and then increasing for higher degrees, although Hevea was slightly more thermally stable than Hancornia. These major influences in the degradation process in the early stage are attributed to differences in non-rubber constituents present in these two species.

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Acknowledgements

Some of the authors (Malmonge, Galiani, Moreno and Mattoso) gratefully acknowledge the financial support provided by Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP), Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) and Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES).

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Authors and Affiliations

  1. Departamento de Engenharia e Materiais, Centro de Tecnologia, Cidade Universitaria, Universidade Federal da Paraíba, CEP 58051-900, João Pessoa, PA, Brazil

    Eliton S. Medeiros

  2. Laboratório Nacional de Nanotecnologia para o Agronegócio, Embrapa Instrumentação Agropecuária, C.P. 741, CEP 13560-970, São Carlos, SP, Brazil

    Patrini D. Galiani, Rogerio M. B. Moreno & Luiz H. C. Mattoso

  3. Departamento de Química, Centro de Ciências Exatas e de Tecnologia, Universidade Federal de São Carlos, Rod. Washington Luís, Km 235, Caixa-Postal 676, CEP 13565-905, São Carlos, SP, Brazil

    Patrini D. Galiani

  4. Departamento de Física e Química, UNESP, São Paulo State University, 15.385-000, Ilha Solteira, SP, Brazil

    José A. Malmonge

Authors
  1. Eliton S. Medeiros
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  2. Patrini D. Galiani
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  3. Rogerio M. B. Moreno
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  4. Luiz H. C. Mattoso
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  5. José A. Malmonge
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Correspondence to José A. Malmonge.

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Medeiros, E.S., Galiani, P.D., Moreno, R.M.B. et al. A comparative study of the non-isothermal degradation of natural rubber from Mangabeira (Hancornia speciosa Gomes) and Seringueira (Hevea brasiliensis). J Therm Anal Calorim 100, 1045–1050 (2010). https://doi.org/10.1007/s10973-009-0477-6

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  • DOI: https://doi.org/10.1007/s10973-009-0477-6

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