Développement de matériaux composites écologiques à base de résines de tannins et de renforts de fibres végétales

Abstract : Tannins are plant chemicals that show a good reactivity and so they can replace similar products from oil chemistry. This is the case for condensed tannins that have reactivity mechanism similar to that of the phenol. They have been used for several years in wood glues, but no in depth study have been carried out on their potential in composite manufacturing. The work presented here can be split into three projects aiming at the development of composite materials of high performances using both tannin based resins and natural fibers reinforcement. 1.The first project aims to develop a thermosetting composite based on the same tannin/hexamine resin already as glue for particleboards. A previous study shown that it was feasible but numerous problems needed to be solved in order to obtain a reliable and competitive manufacturing process. 2.The goal of the second project is the study and the development of composites which matrix is based on a copolymer of tannin and furfuryl alcohol. Furanic resins show good properties and their capability to react with phenolic compounds makes them potential candidates for the manufacturing of high performances composites. 3.The last project’s objective is the production of acetylated tannins by using similar methods than that used for lignin, to check if they present the same thermoplastic behavior and if yes, to test them in composite manufacturing.
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Arnaud Nicollin. Développement de matériaux composites écologiques à base de résines de tannins et de renforts de fibres végétales. Autre. Université de Lorraine, 2014. Français. ⟨NNT : 2014LORR0086⟩. ⟨tel-01750809⟩

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