Abstract
In this work the effect of a combined NaOH + peracetic acid (PAA) purification treatment on the valorization of almond shell (AS) and rice husk (RH) lignocellulosic residues as fillers in PHB-based composites for short shelf life applications has been studied. The efficiency of the treatment at removing the non-cellulosic components of the fibers has been evaluated by SEM, FTIR, WAXS and TGA taking a commercial cellulose as reference. The influence of the untreated and treated fibers on the morphology, thermal, crystallization, tensile properties, fracture toughness and dynamo mechanical behavior of the PHB/fiber composites has been studied. The treatment has demonstrated its ability at removing the lignin, hemicelluloses and waxes allowing the obtention of fibers with relative crystallinity, thermal stability and composition similar to the commercial cellulose. The different agro-food based lignocellulosic residues used resulted in two suitable reinforcing fillers for a PHB matrix. Hence, composites prepared with the treated fibers presented better thermal and mechanical performance than those prepared with the untreated ones. Therefore, the so-obtained purified residue fibers are comparable to a pure cellulose as a filler for PHB composites.
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Acknowledgements
The authors would like to thank the financial support for this research from Ministerio de Ciencia, Innovación y Universidades (RTI2018-097249-B-C22), Pla de Promoció de la Investigació de la Universitat Jaume I (UJI-B2019-44) and H2020 EU Project YPACK (H2020-SFS-2017-1, Reference 773872). Authors would like to acknowledge the Instituto de Tecnología de Materiales of Universitat Politècnica de València-Campus de Alcoy, the Unidad Asociada IATA-UJI “Polymers Technology” and Servicios Centrales de Instrumentación Científica (SCIC) of Universitat Jaume I. We are also grateful to Raquel Oliver and Jose Ortega for experimental support.
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Sánchez-Safont, E.L., Aldureid, A., Lagarón, J.M. et al. Effect of the Purification Treatment on the Valorization of Natural Cellulosic Residues as Fillers in PHB-Based Composites for Short Shelf Life Applications. Waste Biomass Valor 12, 2541–2556 (2021). https://doi.org/10.1007/s12649-020-01192-1
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DOI: https://doi.org/10.1007/s12649-020-01192-1