A Systematic Study of the Structural Properties of Technical Lignins.

IF 4.9 3区工程技术 Q1 POLYMER SCIENCE Polymers Pub Date : 2025-01-16 DOI:10.3390/polym17020214

Keiti Gilioli Tosin, Noriê Finimundi, Matheus Poletto

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Abstract

Technical lignins are globally available and a sustainable feedstock. The unique properties of technical lignins suggest that these materials should have several industrial applications. The main proposal of this study is to evaluate the relationship between the structure and properties of two technical lignins. Morphological, chemical, physical, and thermal properties of sodium lignosulfonate (LGNa) and magnesium lignosulfonate (LGMg) were investigated. The results showed that a higher formation of intramolecular hydrogen bonds may occur in lignins with a higher content of phenolic hydroxyl groups, such as LGMg. As a result, an increase in the energy of hydrogen bonds in the lignosulfonate structure was observed, without significant change in the hydrogen bond distances. In addition, higher content of phenolic hydroxyl groups might also reduce lignosulfonates thermal stability. The combustion index value was three times higher for LGMg than for LGNa. The characterization study also revealed that phenolic hydroxyl groups influence the main properties of technical lignins and can be a determining factor when these lignosulfonates are used in industrial applications.

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工业木质素结构性质的系统研究。

技术木质素是全球可用的可持续原料。技术木质素的独特性质表明，这些材料应该有几个工业应用。本研究的主要目的是评价两种工艺木质素的结构与性能之间的关系。研究了木质素磺酸钠（LGNa）和木质素磺酸镁（LGMg）的形态、化学、物理和热性能。结果表明，酚羟基含量越高的木质素（如LGMg），其分子内氢键的形成率越高。结果表明，木质素磺酸盐结构中氢键能量增加，但氢键距离没有明显变化。此外，较高的酚羟基含量也可能降低木质素磺酸盐的热稳定性。LGMg的燃烧指数值是LGNa的3倍。表征研究还表明，酚羟基会影响技术木质素的主要性质，并可能成为这些木质素磺酸盐在工业应用中的决定因素。

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来源期刊

Polymers POLYMER SCIENCE-

CiteScore

8.00

自引率

16.00%

发文量

4697

审稿时长

1.3 months

期刊介绍： Polymers (ISSN 2073-4360) is an international, open access journal of polymer science. It publishes research papers, short communications and review papers. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. Therefore, there is no restriction on the length of the papers. The full experimental details must be provided so that the results can be reproduced. Polymers provides an interdisciplinary forum for publishing papers which advance the fields of (i) polymerization methods, (ii) theory, simulation, and modeling, (iii) understanding of new physical phenomena, (iv) advances in characterization techniques, and (v) harnessing of self-assembly and biological strategies for producing complex multifunctional structures.