Controlled molecular reorientation enables strong cellulose fibers regenerated from ionic liquid solutions
Artikel i vetenskaplig tidskrift, 2015

Cellulose is difficult to solubilize and undergoes thermal decomposition prior to melting. In recent years ionic liquids have been evaluated as solvents of cellulose. In the regeneration process the non-solvent governs the resulting material's crystallinity. Water adsorbs to amorphous cellulose, acts as plasticizer and lowers the T g , hence the degree of crystallinity will affect the potential strain induced reorientation. We prepared regenerated cellulose fibers form ionic liquid using different non-solvents. The influence of shear forces upon cellulose chain alignment during extrusion was simulated in silica based upon rheological measurements. The regenerated fibers had different physical, morphological and mechanical properties. Molecular re-orientation in fibers induced by mechanical strain, at humidities above the T g , resulted in much improved mechanical properties with the Young's modulus reaching 23.4 ± 0.8 GPa and the stress at break 504.6 ± 51.9 MPa, which is comparable to commercially available cellulose fibers.

Natural fibers

Mechanical properties

Cellulose

Stresses

Molecular orientation

Regenerated cellulose fibers

Regenerated cellulose

Cellulose Fibers

Regeneration process

Molecular reorientation

Decomposition

Fibers

Liquids

Solvents

Textile fibers

Elastic moduli

Rheological measurements

Degree of crystallinity

Melting

Amorphous cellulose

Solutions

Resulting materials

Pyrolysis

Ionic liquids

Ions

Ionic liquid

Reorientation

Strain

Författare

J. Sundberg

Unknown organization

V. Guccini

Unknown organization

Karl Håkansson

Chalmers, Kemi och kemiteknik, Tillämpad kemi, Polymerteknologi

G. Salazar-Alvarez

Unknown organization

Guillermo Toriz Gonzalez

Unknown organization

Paul Gatenholm

Chalmers, Kemi och kemiteknik, Tillämpad kemi, Polymerteknologi

Wallenberg Wood Science Center (WWSC)

Polymer

0032-3861 (ISSN)

Vol. 75 119-124

Ämneskategorier

Polymerkemi

DOI

10.1016/j.polymer.2015.08.035