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Moisture induced plasticity of amorphous cellulose films from ionic liquid

Johan Sundberg (Institutionen för kemi- och bioteknik, Polymerteknologi) ; Guillermo Toriz ; Paul Gatenholm (Institutionen för kemi- och bioteknik, Polymerteknologi)
Polymer (0032-3861). Vol. 54 (2013), 24, p. 6555-6560.
[Artikel, refereegranskad vetenskaplig]

Amorphous cellulose films were created by regeneration from 1-Ethyl-3-methylimidazolium acetate (EmimAc) solutions. Their mechanical properties were analyzed as a function of water content. Cellulose with different molecular weights, i.e. microcrystalline cellulose (Avicel), Spruce cellulose and bacterial nanocellulose (BNC), were used for film preparation. All the regenerated films were free from EmimAc residues as shown by Fourier transform infrared spectroscopy (FTIR), amorphous as shown by wide angle X-ray spectroscopy (WAXS) and optical transparent. The equilibrium water content (w/w) was measured at different relative humidities. The plasticizing effect of water on the films was evidenced by both tensile tests and dynamical mechanical analysis (DMA) with humidity scans. The mechanical properties were clearly related to the proportional water uptake of the films. The sample with the longest cellulose chains, i.e. BNC, showed significantly larger elongation to brake at high moisture content which was owed to chain entanglements. (C) 2013 Elsevier Ltd. All rights reserved.

Nyckelord: Amorphous cellulose films, Ionic liquid, Mechanical properties, mechanical-properties, bound water, bacterial cellulose, temperature, dissolution, regeneration, solvent, crystallinity, chloride, fibers



Denna post skapades 2013-12-17. Senast ändrad 2014-02-17.
CPL Pubid: 189440

 

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Institutioner (Chalmers)

Institutionen för kemi- och bioteknik, Polymerteknologi (2005-2014)

Ämnesområden

Textil-, gummi- och polymermaterial

Chalmers infrastruktur