Effect of Coconut, Sisal and Jute Fibers on the Properties of Starch/Gluten/Glycerol Matrix |
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Authors: | Elisângela Corradini Syed H Imam José A M Agnelli Luiz H C Mattoso |
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Institution: | 1. Departamento de Engenharia de Materiais da UFSCar, CP 676, 13560-905, S?o Carlos, SP, Brazil 3. Embrapa Instrumenta??o Agropecuária, CP 741, 13560-970, S?o Carlos, SP, Brazil 2. Bioproduct Chemistry & Engineering Research Unit, Western Regional Research Center, ARS-USDA, Albany, CA, 94710, USA
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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.
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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Keywords: | Starch Gluten Coconut Sisal Jute Fiber Composite Reinforcement Cellulosic |
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