Eventos Anais de eventos
COBEM 2017
24th ABCM International Congress of Mechanical Engineering
PREPARATION AND CHARACTERIZATION OF REPROCESSED COMPOSITES OF POLYPROPYLENE REINFORCED BY WOOD FIBERS: PHYSICAL AND MECHANICAL PROPERTIES
Submission Author:
Felipe Jedyn , PR
Co-Authors:
Thais Helena Sydenstricker Flores-Sahagun, Kelly Priscila Agapito, ROSA MARIA JIMENEZ AMEZCUA, Felipe Jedyn
Presenter: Felipe Jedyn
doi://10.26678/ABCM.COBEM2017.COB17-1636
Abstract
This study aims to discuss the effects of the reprocessing on the performance of wood-plastic composites regarding their physical and mechanical properties. Composites composed of a polypropylene (PP) matrix reinforced by sawdust of Pinus elliottii compounded by a two-step extrusion process (wood fibers coated with PP/polymeric compatibilizer followed by the preparation of the composites) were prepared with 20 and 30 wt% of wood fibers, with and without the use of 10 wt% of a domestic compatibilizer maleated polypropylene (MAPP), produced by reactive extrusion. The composites were submitted up to six reprocessing cycles by extrusion in the same single-screw extruder used in the compounding step. To evaluate the changes in the mechanical properties due to the reprocessing cycles, tensile and flexural tests were carried out in specimens prepared by compression molding of both virgin and reprocessed composites after three and six cycles. The fractured surfaces of chosen tensile tested specimens were examined by Scanning Electron Microscopy (SEM). The influence of the reprocessing cycles were also discussed in terms of water absorption, viscosity, interfacial wood fiber/polymer adhesion, density and other characteristics such as color and odor for both virgin and reprocessed composites.
Keywords
WPC, Reprocessing, MAPP, Sawdust
