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Designed lignocellulosic -based films f or tunable physico -chemical and spectral properties

Designed lignocellulosic -based films f or tunable physico -chemical and spectral properties. Aguié-Béghin V , Muraille L., Paës G, Chabbert B. Objective & Strategy. Physical , chemical , and cytochemical studies of LC deconstruction and properties

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Designed lignocellulosic -based films f or tunable physico -chemical and spectral properties

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  1. Designed lignocellulosic-based films for tunable physico-chemical and spectral properties Aguié-BéghinV, Muraille L., Paës G, Chabbert B

  2. Objective & Strategy • Physical , chemical , and cytochemicalstudies of LC deconstruction and properties • Determining and isolating individual features that limit LC deconstruction, and govern LC properties : role of polymer interactions • Designing Lignocellulose-based self-assemblies (films) • Assemblies of plant cell walls which mimic some of the interactions, composition, physical states found in plant cell wall • Nanostructured LC with variable properties

  3. Designing bioinspired LC assemblies Elementary building brick: Cellulose: Cellulose nanocrystals, nanofibrils (CNCs, CNF) (from ramie, flax, hemp fibers) Hemicelluloses: feruloylatedarabinoxylans, xylan, glucomannan Lignin: model lignin (DHP) and lignin from biorefinery FlaxCN Ramie CN Aspect ratio ~ 30-50 Mw ~3000 g mol-1 Ralph et al., 2007

  4. Designing bioinspired Lignocellulose-based films Nanostructurationof bio-inspired LC assemblies: Modulation of polymer interactions (non covalent/ covalent linkages): - physicalblending - polymerization or cross-linking of phenyl propane units via enzymaticreaction or chemicaloxidation Hemicellulose (Xylan or Feruloylated ArabinoXylan (FAX)) Non cellulosic polysaccharide- lignin (LCC) Interactions Non-covalent and covalent Hydrogen-bonds van der Waals and Hydrophobicinteractions Ether bonds Cellulose Nanocrystals (CN) Hemicellulose - CN Bioinspired assemblies complexity

  5. Main results Bioinspired LC model systems Nanostructuration of LC polymersgeneratebioinspiredsystemswithenhanced physico-chemicalproperties : Modulation of interactions (covalent, non-convalent) between polymers – Impact on physico-chemical (water sorption and spectral properties), – Impact on mechanical properties, – up-grading value of lignin in nanocomposites Relevant templates which emphasize the relative and quantitative importance of selected parameters (LC network, protein) on probes mobility: – Characterization and understanding of probe mobility in lignocelluloses – Model to predictmacromolecular design of efficient lignocellulolyticenzymes

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