Melt processing of polymer biocomposites
Marinho, Juliana França; Braga, Natália Ferreira; Krohn, Annelise; Myata, Fernanda Salviano; Silveira, Luiz Henrique; Cabral Neto, Abner; Fechine, Guilhermino J. M.
http://dx.doi.org/10.1590/0104-1428.1847
Polímeros: Ciência e Tecnologia, vol.25, n2, p.133-136, 2015
Abstract
A coupled device extruder and injection moulding were used to prepare biocomposites in order to provide a continuous and large-scale production, and overcome the fiber degradation inside the extruder. Two types of biocomposites were prepared, Sisal/poly(buthylene adipate-co-terephthlate) – PBAT and Juta/poly(lactide acid)/poly(buthylene adipateco-terephthlate) blend. The biocomposites were prepared with fiber as-received and alkaline treated. The mechanical properties of biocomposites were increased by the fibers content; and the alkaline treatment was efficient to promote a good adhesion between fiber and polymer. In the case of the Juta fiber, the alkaline treatment used was too strong and led to fiber degradation. The results presented here show an alternative and continuous process to obtain biocomposites with relevant mechanical properties using fiber roving and avoiding fiber degradation.
Keywords
biocomposite, natural fibers, PBAT, PLA/PBAT, alkaline treatment.
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4. Rosa, M. F., Chiou, B.-S., Medeiros, E. S., Wood, D. F., Williams, T. G., Mattoso, L. H. C., Orts, W. J., & Imam, S. H. (2009). Effect of fiber treatments on tensile and thermal properties of starch/ethylene vinyl alcohol copolymers/coir biocomposites. Bioresource Technology, 100(21), 5196-5202. http://dx.doi.org/10.1016/j.biortech.2009.03.085. PMid:19560341
5. Matkó, S., Toldy, A., Keszei, S., Anna, P., Bertalan, G., & Marosi, G. (2005). Flame retardancy of biodegradable polymers and biocomposites. Polymer Degradation & Stability, 88(1), 138145. http://dx.doi.org/10.1016/j.polymdegradstab.2004.02.023.
6. Coombes, A. G. A., Verderio, E., Shaw, B., Li, X., Griffin, M., & Downes, S. (2002). Biocomposites of non-crosslinked natural and synthetic polymers. Biomaterials, 23(10), 2113-2118. http://dx.doi.org/10.1016/S0142-9612(01)00341-6. PMid:11962651
7. Corradini, E., Imam, S., Agnelli, J. M., & Mattoso, L. C. (2009). Effect of coconut, sisal and jute fibers on the properties of starch/gluten/glycerol matrix. Journal of Polymers and the Environment, 17(1), 1-9. http://dx.doi.org/10.1007/s10924009-0115-1.
8. Nadhan, A. V., Rajulu, A. V., Li, R., Jie, C., & Zhang, L. (2012). Properties of regenerated cellulose short fibers/cellulose green composite films. Journal of Polymers and the Environment, 20(2), 454-458. http://dx.doi.org/10.1007/s10924-011-0398-x.
9. Lemos, A. L., & Martins, R. M. (2014). Desenvolvimento e caracterização de compósitos poliméricos à base de poli (ácido lático) e fibras naturais development and characterization of polymeric composites. Polímeros: Ciência e Tecnologia, 24, 190-197. http://dx.doi.org/10.4322/polimeros.2014.047.
10. Santos, E. F., Moresco, M., Rosa, S. M. L., & Nachtigall, S. M. B. (2010). Extrusão de compósitos de PP com fibras curtas de coco : efeito da temperatura e agentes de acoplamento. Polímeros: Ciência e Tecnologia, 20, 215-220. http://dx.doi.org/10.1590/S0104-14282010005000036.
11. Santos, P. A., Spinacé, M. A. S., Fermoselli, K. K. G., & De Paoli, M.-A. (2009). Efeito da forma de processamento e do tratamento da fibra de curauá nas propriedades de compósitos com poliamida-6. Polímeros: Ciência e Tecnologia, 19, 31-39. http://dx.doi.org/10.1590/S0104-14282009000100010.
12. Nam, T. H., Ogihara, S., Tung, N. H., & Kobayashi, S. (2011). Effect of alkali treatment on interfacial and mechanical properties of coir fiber reinforced poly(butylene succinate) biodegradable composites. Composites. Part B, Engineering, 42(6), 16481656. http://dx.doi.org/10.1016/j.compositesb.2011.04.001.
13. Li, X., Tabil, L. G., & Panigrahi, S. (2007). Chemical treatments of natural fiber for use in natural fiber-reinforced composites: a review. Journal of Polymers and the Environment, 15(1), 25-33. http://dx.doi.org/10.1007/s10924-006-0042-3.
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