Tosin Keiti Gilioli, Finimundi Noriê, Poletto Matheus
Postgraduate Program in Engineering of Processes and Technologies (PGEPROTEC), University of Caxias do Sul (UCS), Caxias do Sul 95070-560, Brazil.
Exact Sciences and Engineering, Chemical Engineering, University of Caxias do Sul (UCS), Caxias do Sul 95070-560, Brazil.
Polymers (Basel). 2025 Jan 16;17(2):214. doi: 10.3390/polym17020214.
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.
工业木质素在全球范围内都可获取，是一种可持续的原料。工业木质素的独特性质表明这些材料应有多种工业应用。本研究的主要目的是评估两种工业木质素的结构与性能之间的关系。对木质素磺酸钠（LGNa）和木质素磺酸镁（LGMg）的形态、化学、物理和热性能进行了研究。结果表明，在具有较高酚羟基含量的木质素（如LGMg）中可能会形成更多的分子内氢键。因此，观察到木质素磺酸盐结构中氢键能量增加，而氢键距离没有显著变化。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的三倍。表征研究还表明，酚羟基会影响工业木质素的主要性能，并且在这些木质素磺酸盐用于工业应用时可能是一个决定性因素。
