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Effect of Coconut, Sisal and Jute Fibers on the Properties of Starch/Gluten/Glycerol Matrix

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Abstract

Coconut, sisal and jute fibers were added as reinforcement materials in a biodegradable polymer matrix comprised of starch/gluten/glycerol. The content of fibers used in the composites varied from 5% to 30% by weight of the total polymers (starch and gluten). Materials were processed in a Haake torque rheometer (120 °C, 50 rpm) for 6 min. The mixtures obtained were molded by heat compression and further characterized. Addition of lignocellulosic fibers in the matrix decreased the water absorption at equilibrium. The diffusion coefficient decreased sharply around 5% fiber concentration, and further fiber additions caused only small variations. The thermogravimetric (TG) analysis revealed improved thermal stability of matrix upon addition of fibers. The Young’s modulus and ultimate tensile strength increased with fiber content in the matrix. The storage modulus increased with increasing fiber content, whereas tanδ curves decreased, confirming the reinforcing effect of the fibers. Morphology of the composites analyzed under the scanning electron microscope (SEM) exhibited good interfacial adhesion between the matrix and the added fibers. Matrix degraded rapidly in compost, and addition of increased amounts of coconut fiber in the matrix caused a slowdown the biodegradability of the matrix.

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Acknowledgements

The authors wish to thank Corn Products Brail Ltda for supplying the starch and gluten products used in this study. The financial and technical support provided by EMBRAPA/Labex CNPq, FINEP, FAPESP and ARS/USDA is gratefully acknowledged.

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Authors and Affiliations

  1. Departamento de Engenharia de Materiais da UFSCar, CP 676, 13560-905, São Carlos, SP, Brazil

    Elisângela Corradini & José A. M. Agnelli

  2. Bioproduct Chemistry & Engineering Research Unit, Western Regional Research Center, ARS-USDA, Albany, CA, 94710, USA

    Syed H. Imam

  3. Embrapa Instrumentação Agropecuária, CP 741, 13560-970, São Carlos, SP, Brazil

    Elisângela Corradini & Luiz H. C. Mattoso

Authors
  1. Elisângela Corradini
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  2. Syed H. Imam
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  3. José A. M. Agnelli
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  4. Luiz H. C. Mattoso
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Correspondence to Syed H. Imam.

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Names are necessary to report factually on available data; however, the USDA neither guarantees nor warrants the standard of the product, and the use of the name by USDA implies no approval of the product to the exclusion of others that may be suitable.

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Corradini, E., Imam, S.H., Agnelli, J.A.M. et al. Effect of Coconut, Sisal and Jute Fibers on the Properties of Starch/Gluten/Glycerol Matrix. J Polym Environ 17, 1–9 (2009). https://doi.org/10.1007/s10924-009-0115-1

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  • DOI: https://doi.org/10.1007/s10924-009-0115-1

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