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Nanocomposites of natural rubber and polyaniline-modified cellulose nanofibrils

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Abstract

Cellulose nanofibrils (CNF) were isolated from cotton microfibrils (CM) by acid hydrolysis and coated with polyaniline (PANI) by in situ polymerization of aniline onto CNF in the presence of hydrochloride acid and ammonium peroxydisulfate to produce CNF/PANI. Nanocomposites of natural rubber (NR) reinforced with CNF and CNF/PANI were obtained by casting/evaporation method. TG analyses showed that coating CNF with PANI resulted in a material with better thermal stability since PANI acted as a protective barrier against cellulose degradation. Nanocomposites and natural rubber showed the same thermal profiles to 200 °C, partly due to the relatively lower amount of CNF/PANI added as compared to conventional composites. On the other hand, mechanical properties of natural rubber were significantly improved with nanofibrils incorporation, i.e., Young’s modulus and tensile strength were higher for NR/CNF than NR/CNF/PANI nanocomposites. The electrical conductivity of natural rubber increased five orders of magnitude for NR with the addition of 10 mass% CNF/PANI. A partial PANI dedoping might be responsible for the low electrical conductivity of the nanocomposites.

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Acknowledgements

The authors acknowledge the Brazilian agencies CNPq, CAPES, and FAPESP for financial support.

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Authors and Affiliations

  1. Departamento de Física e Química, Faculdade de Engenharia, UNESP – Univ. Estadual Paulista, Campus de Ilha Solteira, Ilha Solteira, SP, Brazil

    M. J. Silva, A. O. Sanches & J. A. Malmonge

  2. Departamento de Engenharia de Materiais, Universidade Federal da Paraíba, João Pessoa, PB, Brazil

    E. S. Medeiros

  3. Laboratório Nacional de Nanotecnologia para o Agronegócio (LNNA), Embrapa Instrumentação (CNPDIA), São Carlos, SP, Brazil

    L. H. C. Mattoso

  4. Western Regional Research Center, USDA-ARS, Albany, CA, 94710, USA

    C. M. McMahan

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  1. M. J. Silva
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  2. A. O. Sanches
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  3. E. S. Medeiros
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  4. L. H. C. Mattoso
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  5. C. M. McMahan
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  6. J. A. Malmonge
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Correspondence to J. A. Malmonge.

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Silva, M.J., Sanches, A.O., Medeiros, E.S. et al. Nanocomposites of natural rubber and polyaniline-modified cellulose nanofibrils. J Therm Anal Calorim 117, 387–392 (2014). https://doi.org/10.1007/s10973-014-3719-1

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  • DOI: https://doi.org/10.1007/s10973-014-3719-1

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