Moisture induced plasticity of amorphous cellulose films from ionic liquid
2013 (English)In: Polymer, ISSN 0032-3861, E-ISSN 1873-2291, Vol. 54, no 24, 6555-6560 p.Article in journal (Refereed) Published
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.
Place, publisher, year, edition, pages
2013. Vol. 54, no 24, 6555-6560 p.
Amorphous cellulose films, Ionic liquid, Mechanical properties
Paper, Pulp and Fiber Technology
IdentifiersURN: urn:nbn:se:kth:diva-153437DOI: 10.1016/j.polymer.2013.10.012ISI: 000326851100007ScopusID: 2-s2.0-84887178145OAI: oai:DiVA.org:kth-153437DiVA: diva2:753335
FunderKnut and Alice Wallenberg Foundation
QC 201410072014-10-072014-10-032014-10-07Bibliographically approved