The challenge of predicting spinnability: Investigating benefits of adding lignin to cellulose solutions in air-gap spinning
Journal article, 2021

In this study, the underlying mechanism for improved spinnability when mixing lignin and cellulose in solution was investigated. Co-processing of lignin and cellulose has previously been identified as a potential route for production of inexpensive and bio-based carbon fibers. The molecular order of cellulose contributes to the strength of the fibers and the high carbon content of lignin improves the yield during conversion to carbon fibers. The current work presents an additional benefit of combining lignin and cellulose; solutions that contain both lignin and cellulose could be air-gap spun at substantially higher draw ratios than pure cellulose solutions, that is, lignin improved the spinnability. Fibers were spun from solutions containing different ratios of lignin, from 0 to 70 wt%, and the critical draw ratio was determined at various temperatures of solution. The observations were followed by characterization of the solutions with shear and elongational viscosity and surface tension, but none of these methods could explain the beneficial effect of lignin on the spinnability. However, by measuring the take-up force it was found that lignin seems to stabilize against diameter fluctuations during spinning, and plausible explanations are discussed.

cellulose and other wood products

rheology

extrusion

Author

Jenny Bengtsson

Chalmers, Chemistry and Chemical Engineering, Chemical Technology, Forest Products and Chemical Engineering

RISE Research Institutes of Sweden

Kerstin Jedvert

RISE Research Institutes of Sweden

Tobias Köhnke

RISE Research Institutes of Sweden

Hans Theliander

Chalmers, Chemistry and Chemical Engineering, Chemical Technology, Forest Products and Chemical Engineering

Journal of Applied Polymer Science

0021-8995 (ISSN) 1097-4628 (eISSN)

Vol. 138 26 50629

Subject Categories

Paper, Pulp and Fiber Technology

Polymer Technologies

Other Chemistry Topics

DOI

10.1002/app.50629

More information

Latest update

4/28/2021