Physical, chemical and mechanical properties of pehuen cellulosic husk and its pehuen-starch based composites |
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Authors: | J Castaño S Rodríguez-Llamazares C Carrasco R Bouza |
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Institution: | Materials Engineering Department, Universidad de Concepción, Edmundo Larenas 270, Concepción, Chile; Unidad de Desarrollo Tecnológico, Universidad de Concepción, Avda. Cordillera 2634, Coronel, Chile. |
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Abstract: | Pehuen cellulosic husk was characterized and employed as reinforcement for composite materials. In this research, thermoplastic pehuen starch (TPS) and TPS/poly(lactic acid) (PLA)/polyvinyl alcohol (PVA) composites, reinforced with 5 and 10% of pehuen husk, were prepared by melt-blending. Comparative samples of pehuen TPS and TPS/PLA/PVA blend were also studied. Physical, thermal, structural and mechanical properties of composites were evaluated. Pehuen husk mainly consists of cellulose (50wt%), hemicellulose (30wt%) and lignin (14wt%). In respect to lipids, this husk has only a 0.6wt%. Its surface is smooth and damage-free and it is decomposed above 325°C. The incorporation of pehuen husk improved considerably the thermal stability and mechanical properties of the studied composites, mainly in TPS composites. Their thermal stability enhances since biofiber hinders the "out-diffusion" of volatile molecules from the polymer matrix, while mechanical properties could raise due to the natural affinity between husk and starch in the pehuen seed. |
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