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<dc:title xml:lang="en">Chemical modification of lignin for the elaboration of novel biobased aromatic polymers and additives</dc:title>
<dcterms:alternative xml:lang="fr">Modification chimique de lignines pour l’élaboration de nouveaux polymères et additifs aromatiques biosourcés</dcterms:alternative>
<dc:subject xml:lang="fr">Lignine</dc:subject>
<dc:subject xml:lang="fr">Biopolymères</dc:subject>
<dc:subject xml:lang="fr">Matériaux polymères</dc:subject>
<dc:subject xml:lang="fr">Chimie click</dc:subject>
<dc:subject xml:lang="fr">Additifs</dc:subject>
<dc:subject xml:lang="en">Lignin</dc:subject>
<dc:subject xml:lang="en">Biopolymers</dc:subject>
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<tef:elementdEntree autoriteExterne="027449491" autoriteSource="Sudoc">Composés aromatiques</tef:elementdEntree>
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<dcterms:abstract xml:lang="fr">Parmi les composants de la biomasse, la lignine est considérée comme l'un des plus prometteurs polymères naturels qui convient à la conversion de la biomasse en valable produits chimiques et matériaux. Malgré une grande quantité de lignine est générée dans l'industrie papetière, seule 2% est exploitée dans l'industrie chimique. La présence de soufre et la grande diversité moléculaire sont les principaux obstacles pour l'utilisation de la lignine. La modification chimique a été reconnue comme un outil pour contourner ces limites. Dans cette thèse, différentes stratégies de synthèse ont été appliquées pour introduire de nouveaux groupes chimiques sur une soude lignine que présents une haute fonctionnalisation de groups hydroxyles. Les dérivés correspondants de lignine ont été utilisés soit pour l’élaboration des matériaux par click polymérisations, soit pour augmenter l’hydrophobicité de la lignine à la fine de faciliter son traitement avec des matrices polymériques.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Among biomass components, lignin is considered one of the most promising natural polymers suitable for the conversion of biomass into renewable added-value chemicals and materials. However, large amount of lignin generated from wood pulping industry is burn as low cost energy source, and only 2% is exploited in the chemical industry. The presence of sulphur moieties and the large molecular diversity are the most reasons impeding the use of lignin as building blocks for the production of chemicals and materials. Chemical modifications have been acknowledged to be an important tool to circumvent these limitations. In the current work, taking advantage of the high hydroxyl groups content of a sulphur free soda lignin (SL), different synthetic strategies have been applied to introduce new chemical groups and used either to produce lignin derivatives suitable for “click” polymerization either to increase lignin hydrophobicity, facilitating its processing in polymeric matrices.</dcterms:abstract>
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