Mechanical properties of novel polymer composites from high density polyethylene plactic waste and cork oak Toussaint Barboni, Svetlana Petlitckaia, Paul-Antoine Santoni University of Corsica – CNRS UMR 6134 SPE e-mail: barboni@univ-corse.fr The use of waste materials as filler and as a matrix for composite materials is a cost-effective and environmentally friendly approach to material production. Waste materials such as plastic, paper, and glass can be used as fillers to add strength and improve the properties of composite materials. Additionally, by using waste materials as the matrix, or the main component, of composite materials, it reduces the need for virgin materials and helps to reduce waste in the environment. In this study, a new composite material based on HDPE waste from bottle caps and cork powder from unused cork (virgin cork) was developped, wich has a high capacity for thermal insulation. . The composites were prepared with virgin and modified cork. The mechanical properties of the composite samples with different cork contents were studied by tensile strength (condition 40 % HR, T = 20 °C). The results show that tensile strength decreases when cork content increases from 0 to 10 %. The reduction of the tensile stress value is not important. The sample without cork particles has the highest tensile strength (18,891 MPa), while the sample with 20 % of cork presents the lowest tensile strength (17,975 MPa). The value of tensile strength for composites with 10, 15 and 20 % of cork fraction is similar. Therefore, the cork content has no significant effect on the value of tensile strength. However, we observe the change of stress-strain relationship. The mechanical properties of the composites were also tested after different environmental exposures such as immersion in distilled water for 2 weeks, storage at T = 60 °C in an oven for 24h, as well as storage at T = 10 °C and 80 % HR and at T = 40 °C and 80 % HR in an environmental chamber for 24h. The tensile strength value remains the same (18 MPa) regardless of environmental exposure. Therefore, there does not seem to be any influence of ambient temperature and humidity on the mechanical properties of HDPE-based composites. References 1. J. Penca, European Plastics Strategy: What promise for global marine litter?, Mar. Policy. 2018, 97, 197-201. 2. L. Tauber et al., Wood polymer composites and their contribution to cascading utilisation, J. Clean Prod. 2015, 110, 9-15. 3. M. Poletto, Thermoplastic composites with wood – a brief review, Rev. Interdisp. Ciencia. 2017, 2, 42-48 4. A. Ashok, C.R. Rejeesh, R. Renjith, Biodegradable polymers for sustainable packaging applications: a review, Int. J. Bionics Biomater. 2016, 2(2), 1-11 5. E. M. Fernandes, V. M. Correlo, J.F. Mano, R. L. Reis, Cork-polymer biocomposites: Mechanical, structural and thermal properties, Materials and Design. 2015, 82, 282-289
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