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ISSN 1517-7076 artigoe-11835, 2017Autor Responsável: Caroline Barbosa da SilvaData de envio: 13/03/2017Data de aceite: 12/05/201710.1590/S1517-707620170002.0168Effect of natural ageing on the propertiesof recycled polypropylene/ethylene vinylacetate/wood flour compositesCaroline Barbosa da Silva1,Andrea Bercini Martins1, André Luis Catto1,Ruth Marlene Campomanes Santana11Laboratório de Materiais Poliméricos – LAPOL – Departamento de Engenharia de Materiais – UFRGSAv. Bento Gonçalves, 9500 - Porto Alegre, RS, Brazil. CP: 15090, CEP 91501-970e-mail: [email protected], [email protected]; [email protected]; [email protected]ABSTRACTWood flour composites main applications are represented by outdoor furnishing. Therefore, it is important toevaluate their behavior under natural ageing conditions. This work aims to investigate the natural ageing im-pact on the mechanical, physical, thermal e morphological properties of recycled polypropylene/ethylenevinyl acetate/wood flour composites (PP/EVA/ITA). Samples were exposed to natural ageing for 12 monthsin Porto Alegre (BR).Mezilaurus itauba(ITA) wood flour was used at 30 % w/w. Results showed that PPfilled wood flour retained a higher fraction of the original mechanical properties after natural ageing. Crystal-linity degree for composites increased from 30.9 up to 37.5% Climatic conditions affected the colorimetricand morphological characteristics of composites, indicating that there was not only photo-degradation butalso thermo-oxidative and hydrolytic degradation. In this way, the use of antioxidant additives and UV pho-to-absorbers is recommended to avoid stress-cracking, discoloration and loss the mechanical properties.Keywords:Wood plastic composite; recycled PP; recycled EVA; natural ageing.1. INTRODUCTIONWith the growing consumer demands, leading to major issues of material availability and environmental sus-tainability, an increased awareness that non-renewable resources are becoming scarce and an inevitable de-pendence on renewable resources began to arise. In this context, the use of renewable materials as lignocellu-losic fillers with thermoplastic polymers has recently increased. Due to large quantity of wood and polymerwaste generated daily, the use of residual wood flour from wood processing with recycled thermoplastic ma-trix is an excellent alternative to replace the use plain wood, as it is less susceptible to moisture inducedswelling, shrinking, and thermal degradation [1].Wood plastic composites (WPC’s) have been gaining considerable attention on international marketdue to their low density, good thermal insulation, sustainability and low price [2,3]. These materials can beused in indoor and outdoor applications, including windows and doorframes, interior panels in cars, railings,decking, cladding and fences [4]. Its dimensional stability tends to be better than that of the traditional woodproducts, thereby rendering them suitable for application in end-uses in humid and water front environments[5

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Term
Spring
Professor
Sticker
Tags
Polymer, elastic modulus, Composite material, Santana

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