Structural modifications of cellulose samples after dissolution into various solvent systems.
This work deals with the modifications resulting from the dissolution of four commercial cellulosic samples, with different crystallinity rates and degrees of polymerization (DPs), in four solvent systems, known and used to dissolve cellulose. The dissolution conditions were optimized for the 16 various systems and followed by turbidity measurements. After regeneration, the samples were analyzed by thermal gravimetric analysis (TGA), scanning electron microscopy (SEM), and X-ray diffractometry (XRD) to study their modification. Viscosimetry measurements were used to evaluate the potential decrease of the DP after dissolution. The observed structural modifications established that, for low DP, all the solvent systems were efficient in dissolving the cellulose without altering the DP, except BMIM [Cl], which provoked a decrease of up to 40 % and a decrease of around 20 % of the degradation temperature (onset temperature, To). For high molecular weight (MW) celluloses, DMSO/TBAF was the only system to allow a complete dissolution without any molar mass loss and degradation temperature modification.
Laboratoire de Chimie Agro-industrielle (LCA), Université de Toulouse, INRA, INPT, 4 allée Emile Monso, 31030, Toulouse, France.|Laboratoire de Chimie Agro-industrielle (LCA), Université de Toulouse, INRA, INPT, INP-EI PURPAN, 75 voie du TOEC, 31076, Toulouse, France.
Jérémy
J
Rebière
Laboratoire de Chimie Agro-industrielle (LCA), Université de Toulouse, INRA, INPT, 4 allée Emile Monso, 31030, Toulouse, France.|Molecular Medicine Research Group, School of Science and Health, Western Sydney University, Parramatta Campus, New South Wales, 2150, Australia.|Australian Centre for Research on Separation Science, School of Science and Health, Western Sydney University, Parramatta Campus, New South Wales, 2150, Australia.
Maëlie
M
Heuls
Australian Centre for Research on Separation Science, School of Science and Health, Western Sydney University, Parramatta Campus, New South Wales, 2150, Australia.
Patrice
P
Castignolles
Molecular Medicine Research Group, School of Science and Health, Western Sydney University, Parramatta Campus, New South Wales, 2150, Australia.|Australian Centre for Research on Separation Science, School of Science and Health, Western Sydney University, Parramatta Campus, New South Wales, 2150, Australia.
Marianne
M
Gaborieau
Laboratoire de Chimie Agro-industrielle (LCA), Université de Toulouse, INRA, INPT, 4 allée Emile Monso, 31030, Toulouse, France. Antoine.Rouilly@ensiacet.fr.
Antoine
A
Rouilly
Laboratoire de Chimie Agro-industrielle (LCA), Université de Toulouse, INRA, INPT, INP-EI PURPAN, 75 voie du TOEC, 31076, Toulouse, France.
Frédéric
F
Violleau
Laboratoire de Chimie Agro-industrielle (LCA), Université de Toulouse, INRA, INPT, 4 allée Emile Monso, 31030, Toulouse, France.
Vanessa
V
Durrieu
Cellulose; Crystallinity index; Degree of polymerization; Dissolution; Structural effects; Underivatizing solvent