Moisture induced plasticity of amorphous cellulose films from ionic liquid
Artikel i vetenskaplig tidskrift, 2013

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.

dissolution

regeneration

crystallinity

mechanical-properties

Ionic liquid

Amorphous cellulose films

bound water

chloride

solvent

bacterial cellulose

fibers

Mechanical properties

temperature

Författare

Johan Sundberg

Chalmers, Kemi- och bioteknik, Polymerteknologi

Guillermo Toriz Gonzalez

Universidad de Guadalajara

Wallenberg Wood Science Center (WWSC)

Paul Gatenholm

Wallenberg Wood Science Center (WWSC)

Chalmers, Kemi- och bioteknik, Polymerteknologi

Polymer

0032-3861 (ISSN)

Vol. 54 24 6555-6560

Ämneskategorier

Textil-, gummi- och polymermaterial

DOI

10.1016/j.polymer.2013.10.012