Polyolefin composites with curaua fibres: Effect of the processing conditions on mechanical properties, morphology and fibres dimensions

Autor(es)

Mano, B. ^[1] ; Araujo, J. R. ^[1] ; Spinace, M. A. S. ^[1] ; De Paoli, M. -A. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Campinas, Inst Quim, BR-13083970 Campinas, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: COMPOSITES SCIENCE AND TECHNOLOGY; v. 70, n. 1, p. 29-35, JAN 2010.
• Citações Web of Science: 46

Resumo

Composites of polypropylene (PP) and high density polyethylene (HDPE) reinforced with 20 wt.% of curaua fibres were prepared using a twin-screw extruder and the effect of screw rotation speed (SRS) was evaluated by measuring the output, the mechanical properties of the composites, the morphology and the fibre dimensions. Increase in SRS causes a decrease in length, diameter and aspect ratio of the fibres in both composites, due to the high shear forces acting in the molten polymer and transferred to the fibres. Consequently, the reinforcement effect of the fibres decreased, as evidenced by the flexural and tensile mechanical properties of the composites. Additionally, polymeric matrices undergoes thermo-mechanical degradation during processing, this also contributed to the changes in the mechanical properties. Comparison between the matrices showed that PP composites are less affected by changes in SRS, suffering fewer changes in fibre dimensional parameters and in the mechanical properties than HDPE composites. (C) 2009 Elsevier Ltd. All rights reserved. (AU)

• Processo FAPESP: 06/58343-7 - Compósitos de polipropileno com fibras de curauá obtidos por extrusão e moldados por injeção
• Beneficiário: Bárbara Íria Silva Mano
• Modalidade de apoio: Bolsas no Brasil - Mestrado
• Processo FAPESP: 04/15084-6 - Materiais poliméricos de baixo impacto ambiental
• Beneficiário: Marco-Aurelio de Paoli
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 06/58342-0 - Compositos de polietileno de alta densidade reforcados com fibra de curaua obtidos por extrusao/injecao.
• Beneficiário: Joyce Rodrigues de Araújo
• Modalidade de apoio: Bolsas no Brasil - Mestrado