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Preparation and characterization of blends of recycled polystyrene with cassava starch

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Abstract

Secondary recycling is an alternative to solve at least part of the worldwide pollution problem caused by persistence of petrochemical plastic materials in the environment. In this work we report the secondary recycling of disposable polystyrene (PS) using cassava starch (Manihot esculenta Crantz) and a natural plasticizer extracted from a palm tree of the Amazon: Buriti (Mauritia flexuosa L.) oil. 13C-NMR spectroscopy reveals incorporation of the oil in the polymer matrix. Although phase separation had occurred, SEM depicts a very good dispersion of the thermoplastic starch (TPS) in the PS matrix with distinct domains. Thermal analyses indicate smaller thermal stability of the PS/TPS blends compared to PS and that possess intermediate characteristics between the pure PS and TPS, confirmed by DRX. Kinetic study shows a lowering of the activation energy for the thermal degradation of the blends.

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Acknowledgements

The authors are grateful for XRD measurements at the Instituto de Geociências – Laboratório de Difração de Raios-X and financial support from UnB-IQ, CNPq, FAP-DF, FINATEC, FINEP-CT INFRA No. 0970/01 and to Dr. J. A. Dias (IQ-UnB) for NMR spectra acquisition.

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Authors and Affiliations

  1. Laboratório de Pesquisa em Polímeros (LabPol), Instituto de Química, Universidade de Brasília, caixa postal 04478, Brasilia, DF, 70904-970, Brazil

    Tais A. P. F. Pimentel, Jussara A. Durães, Adriana L. Drummond, Daniela Schlemmer & Maria José Araújo Sales

  2. Laboratório de Microscopia Eletrônica do RGB – EMBRAPA, San Paulo, Brazil

    Rosana Falcão

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  1. Tais A. P. F. Pimentel
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  2. Jussara A. Durães
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  3. Adriana L. Drummond
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  4. Daniela Schlemmer
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  5. Rosana Falcão
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  6. Maria José Araújo Sales
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Correspondence to Maria José Araújo Sales.

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Pimentel, T.A.P.F., Durães, J.A., Drummond, A.L. et al. Preparation and characterization of blends of recycled polystyrene with cassava starch. J Mater Sci 42, 7530–7536 (2007). https://doi.org/10.1007/s10853-007-1622-x

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  • DOI: https://doi.org/10.1007/s10853-007-1622-x

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