Structural modifications of cellulose samples after dissolution into various solvent systems.
Identifieur interne : 001698 ( Main/Merge ); précédent : 001697; suivant : 001699Structural modifications of cellulose samples after dissolution into various solvent systems.
Auteurs : Jérémy Rebière [France] ; Maëlie Heuls [France] ; Patrice Castignolles [Australie] ; Marianne Gaborieau [Australie] ; Antoine Rouilly [France] ; Frédéric Violleau [France] ; Vanessa Durrieu [France]Source :
- Analytical and bioanalytical chemistry [ 1618-2650 ] ; 2016.
Abstract
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, T o). 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.
DOI: 10.1007/s00216-016-9958-1
PubMed: 27695986
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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, T o). 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.</div></front></TEI></record>Pour manipuler ce document sous Unix (Dilib)
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