Swelling and dissolution mechanisms of cellulose fibres

摘要: The focus of this work was to study the swelling and dissolution cellulose fibres by varying quality solvent (N-methylmorpholine-N-oxide with various amount water, NaOH 8% - water), conditions, as tension, sources (cotton, wood pulps, regenerated derivatives). mechanisms were investigated high resolution microscopic observations. A selective separation insoluble soluble fractions performed a centrifugation method. Molar mass distribution, crystallinity, sugar composition, allomorphy material each fraction analysed. From all these investigations, we able better describe identify main parameters involved in dissolution. Our results show that structural molecular characteristics well process must be controlled improve dissolution, (i) are linked convection possibility movements bath. (ii) Structural removal external walls, destructuration layer structure hemicelluloses. (iii) Molecular dealing thermodynamic, chain length, but also enhancement conformational mobility chains.