Journal
CARBOHYDRATE POLYMERS
Volume 206, Issue -, Pages 674-684Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2018.11.030
Keywords
Cellulose diacetate; Cellulose mixed ester; Acylation; Plasticization; Tg; Fatty chains; Water permeability
Categories
Funding
- region Auvergne Rhone Alpes
- FEDER European funds
- FUI FOR-TUNE
- Bpi France
- DGE (Directorate General for Enterprise)
- Minister for Enterprises
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In this study, we report a simple, non-degrading and efficient homogeneous acylation of cellulose diacetate (CDA) by using a large panel of commercially available acylating aliphatic moieties, differing in their structure (fatty, ramified, bulky, cycloaliphatic, aromatic, more or less spaced from the cellulose backbone), in view of generating a library of well-defined cellulose mixed esters with enhanced thermoplasticity. As reflected by a lowering of the glass temperature (Tg), the covalent grafting confers an improved mobility to the cellulose chains, by disrupting the initial H-bonds. In particular, it appears that the gain in free volume is tailored by the substituent structure and that acylating reagents consisting in a terminal bulky moieties spaced from CDA chains by a linear chain efficiently separate macromolecular chains without generating detrimental stiffening inter-actions (low Tg around 125 degrees C). Moreover, free-standing films easily prepared by solvent casting exhibit relevant water transport properties, which are closely dictated and tuned by the water solubility of the cellulose mixed ester.
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