The glass transition temperature of isolated native, residual, and technical lignin

IF 2.2 3区 农林科学 Q2 FORESTRY
Holzforschung Pub Date : 2024-03-04 DOI:10.1515/hf-2023-0111
Åke Henrik-Klemens, Fabio Caputo, Roujin Ghaffari, Gunnar Westman, Ulrica Edlund, Lisbeth Olsson, Anette Larsson
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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 gs of EMAL were found to be closer to their in situ counterparts than MWL.
分离的原生木质素、残留木质素和工业木质素的玻璃化转变温度
原生木质素、残留木质素和工业木质素的玻璃化转变温度(T g)对木质纤维素制浆、纸浆加工和副流利用非常重要;然而,从原生木质素到残留木质素和工业木质素的结构变化如何影响 T g 却很难阐明。由于大分子的 T g 受分子量影响很大,因此低分子量馏分(如碾磨木质素 (MWL))不能很好地代表细胞壁中的木质素。为了避免这一问题,我们采用酶法温和酸解木质素(EMAL)方案从挪威云杉和软木牛皮浆中分离出了高产率和高纯度的木质素。技术软木牛皮浆木质素也被分成了不同分子量的组,以获得跨越宽分子量范围的木质素。使用动态机械分析(DMA)的粉末样品架来测定木质素的 T g,因为热量测定法对其不够灵敏。结果发现,EMAL 的 T gs 比 MWL 更接近其原位对应物。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Holzforschung
Holzforschung 工程技术-材料科学:纸与木材
CiteScore
4.60
自引率
4.20%
发文量
83
审稿时长
3.3 months
期刊介绍: Holzforschung is an international scholarly journal that publishes cutting-edge research on the biology, chemistry, physics and technology of wood and wood components. High quality papers about biotechnology and tree genetics are also welcome. Rated year after year as one of the top scientific journals in the category of Pulp and Paper (ISI Journal Citation Index), Holzforschung represents innovative, high quality basic and applied research. The German title reflects the journal''s origins in a long scientific tradition, but all articles are published in English to stimulate and promote cooperation between experts all over the world. Ahead-of-print publishing ensures fastest possible knowledge transfer.
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