Effet des modifications de surface sur les propriétés morphologiques et mécaniques de composites à base de coquille de sarrasin et de polyéthylène

Authors: Sadeghi, Vahid
Advisor: Rodrigue, Denis
Abstract: This project focuses on the production and characterization of composites based on a thermoplastic polymer (high density polyethylene) and a natural fiber (buckwheat shells) as a valorization of the latter. The samples were prepared with three different compounds. The first part deals with untreated shells used directly in the polymer matrix. The second part deals with the shells treated (mercerization) before their introduction into the polymer matrix, while the final part deals with the shells treated with the addition of a coupling agent(polyethylene grafted with maleic anhydride). All the samples were prepared at concentrations of 10, 20, 30 and 40% by weight of buckwheat shells to compare with the matrix alone (0%). Plates were then made by compression molding to prepare the test specimens. The morphological (scanning electron microscopy), physical (density and hardness) and mechanical (tension, bending and impact) characteristics were measured on the samples produced. Based on the results obtained, it was observed that some mechanical and physical properties were improved, but only by using the alkali treatment in combination with the coupling agent. In general, the best results were obtained for a concentration of 30% by weight.
Document Type: Mémoire de maîtrise
Issue Date: 2021
Open Access Date: 17 May 2021
Permalink: http://hdl.handle.net/20.500.11794/69130
Grantor: Université Laval
Collection:Thèses et mémoires

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