2024/03/04 by Åke Henrik-Klemens, Fabio Caputo, Roujin Ghaffari +4
Engineering · Materials Science · #Advanced Cellulose Research Studies #Lignin and Wood Chemistry #Wood Treatment and Properties
paper · pdf · doi:10.1515/hf-2023-0111
openalex publication_date 2024/03/04 · crossref created 2024/03/04 · crossref issued 2024/03/05 · crossref published 2024/03/05 · crossref published-online 2024/03/05 · crossref deposited 2024/04/10 · crossref published-print 2024/04/25 · openalex created_date 2025/10/10 · crossref indexed 2026/07/28 · openalex updated_date 2026/08/01
Abstract 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 g s of EMAL were found to be closer to their in situ counterparts than MWL.