The glass transition temperature of isolated native, residual, and technical lignin
Artikel i vetenskaplig tidskrift, 2024

The glass transition temperatures (T g) of native, residual, and technical lignins are important to lignocellulose pulping, pulp processing and side stream utilization; however, how the structural changes from native to residual and technical lignin influences T g has proven difficult to elucidate. Since the T g of macromolecules is greatly influenced by the molecular weight, low-molecular-weight fractions, such as milled wood lignin (MWL), are poor representatives of lignin in the cell wall. To circumvent this problem, lignins of both high yield and purity were isolated from Norway spruce and softwood kraft pulp using the enzymatic mild acidolysis lignin (EMAL) protocol. Technical softwood kraft lignin was also fractionated into groups of different molecular weights, to acquire lignin that spanned over a wide molecular-weight range. A powder sample holder for dynamic mechanical analysis (DMA), was used to determine the T g of lignins, for which calorimetric methods were not sensitive enough. The T gs of EMAL were found to be closer to their in situ counterparts than MWL.

dynamic mechanical analysis

Thermoplastic properties

lignocellulose

Kraft pulping

Författare

Åke Henrik-Klemens

Chalmers, Kemi och kemiteknik, Tillämpad kemi

Fabio Caputo

Chalmers, Life sciences, Industriell bioteknik

Roujin Ghaffari

Chalmers, Kemi och kemiteknik, Tillämpad kemi

Gunnar Westman

Chalmers, Kemi och kemiteknik, Kemi och biokemi

Ulrica Edlund

Kungliga Tekniska Högskolan (KTH)

Lisbeth Olsson

Chalmers, Life sciences, Industriell bioteknik

Anette Larsson

Chalmers, Kemi och kemiteknik, Tillämpad kemi

Holzforschung

0018-3830 (ISSN) 1437-434X (eISSN)

Vol. 78 4 216-230

Design for Circularity: Lignocellulose based Thermoplastics - Fib:Re

VINNOVA (2019-00047), 2020-01-01 -- 2024-12-31.

Ämneskategorier

Trävetenskap

Pappers-, massa- och fiberteknik

DOI

10.1515/hf-2023-0111

Mer information

Senast uppdaterat

2024-04-27