The challenge of predicting spinnability: Investigating benefits of adding lignin to cellulose solutions in air-gap spinning
Artikel i vetenskaplig tidskrift, 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.

rheology

extrusion

cellulose and other wood products

Författare

Jenny Bengtsson

RISE Research Institutes of Sweden

Chalmers, Kemi och kemiteknik, Kemiteknik, Skogsindustriell kemiteknik

Kerstin Jedvert

RISE Research Institutes of Sweden

Tobias Köhnke

RISE Research Institutes of Sweden

Hans Theliander

Chalmers, Kemi och kemiteknik, Kemiteknik, Skogsindustriell kemiteknik

Journal of Applied Polymer Science

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

Vol. In Press

Ämneskategorier

Pappers-, massa- och fiberteknik

Polymerteknologi

Annan kemi

DOI

10.1002/app.50629

Mer information

Senast uppdaterat

2021-03-15