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Les mélanges polyamides et lignine, une alternative renouvelable pour la réalisation de nouvelles fibres organiques et de précurseurs pour fibres de carbone

Abstract : Carbon fibers (CF) are the essential reinforcing material in high performance composite industry. They are generally produced from polyacrylonitrile (PAN), a costly precursor from fossil origin, and are mainly used in high added-value sectors. Alternative bio-sourced and low-cost precursors are being considered in order to get rid of the PAN for weight reduction in automotive industry. Lignin, which has long been identified among the precursors of cheap renewable origin, is now available in industrial quantities and qualities. However, its variability and molecular complexity often require the production of hybrid precursors. Combination with other polymers makes it possible to retain the advantages of each of the constituents (cost, processability, mechanical properties, etc.). The work presented in this manuscript, stems from this observation and focusses on the use of blends of lignin and thermoplastic polyamides. Different types of polyamides (PA11, PA12, PEBA) are studied in a molten mixtures with a hardwood lignin extracted via the organosolv process. The materials are characterized by calorimetric, thermogravimetric, rheological and mechanical analyzes. It is shown that the hydrophilicity of the block copolymer PEBA leads to a total miscibility of the lignin; making it possible the integration of a high proportion of material from renewable sources. PA 11, although immiscible, has a high affinity with lignin molecules. These mixtures lead to blends with mechanical properties comparable to that of the neat polymer while containing a strong amount of renewable components. Moreover, the carbonization of these materials leads to the formation of carbon fibers, with modest properties but still comparable with the existing lignin based CFs.
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Submitted on : Thursday, April 12, 2018 - 2:26:06 PM
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Teddy Fournier. Les mélanges polyamides et lignine, une alternative renouvelable pour la réalisation de nouvelles fibres organiques et de précurseurs pour fibres de carbone. Autre. Université de Bordeaux, 2017. Français. ⟨NNT : 2017BORD0866⟩. ⟨tel-01764903⟩

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