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.

Mechanical properties

Amorphous cellulose

Decomposition

Cellulose Fibers

Resulting materials

Textile fibers

Molecular reorientation

Strain

Pyrolysis

Cellulose

Degree of crystallinity

Natural fibers

Fibers

Liquids

Melting

Regenerated cellulose

Ions

Solvents

Regenerated cellulose fibers

Stresses

Rheological measurements

Regeneration process

Ionic liquid

Molecular orientation

Reorientation

Ionic liquids

Solutions

Elastic moduli

Författare

J. Sundberg

V. Guccini

Karl Håkansson

Chalmers, Kemi och kemiteknik, Tillämpad kemi, Polymerteknologi

G. Salazar-Alvarez

Guillermo Toriz Gonzalez

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

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Senast uppdaterat

2018-08-24