A lignin-based industrial waste was converted to a value-added reinforcing agent for epoxy matrix composites. Thus, a facile three-step strategy including methylolation, epoxidation and carbonation (i.e., CO₂ fixation) was conducted to prepare the reactive filler as a cyclocarbonated lignosufonate (CLS). Then, CLS (10, 20, and 30 wt%) was blended with DGEBA epoxy resin followed by amine-curing to produce the biocomposites. Spectral, thermal, thermomechanical, mechanical and morphological properties of the CLS-epoxy composites were studied by FTIR, DSC/TGA, DMTA, tensile/flexural testing and SEM, respectively. In comparison with the neat DGEBA network, by increasing the CLS% in the biocomposite, tensile strength decreased, flexural modulus was well-preserved, and the Young's and storage modulus were greatly improved. It was attributed to stiffening effect of the modified lignin particles as well as the formation of urethane bonds and intermolecular interactions such as hydrogen bonding. The glass transition temperature for the biocomposites with 10 and 20 wt% of CLS showed negligible change. The incorporation of the carbonated lignin into epoxy resin could provide an eco-effective approach toward inexpensive high performance biocomposites.

将木质素基工业废料转化为用于环氧基复合材料的增值增强剂。因此，一个简单的三步策略包括羟甲基化，环氧化和碳酸化（即，CO ₂进行固着）以制备反应性填料为环碳酸化的木质素磺酸盐（CLS）。然后，将CLS（10、20和30 wt％）与DGEBA环氧树脂混合，然后进行胺固化以生产生物复合材料。通过FTIR，DSC / TGA，DMTA，拉伸/弯曲测试和SEM分别研究了CLS-环氧树脂复合材料的光谱，热，热机械，力学和形态学性能。与纯DGEBA网络相比，通过增加生物复合材料的CLS％，抗张强度降低，挠曲模量得到很好的保留，杨氏模量和储能模量大大提高。这归因于改性木质素颗粒的硬化作用以及氨基甲酸酯键的形成和诸如氢键的分子间相互作用。具有10和20重量％的CLS的生物复合材料的玻璃化转变温度显示可忽略不计的变化。将碳酸化木质素掺入环氧树脂中可以为廉价的高性能生物复合材料提供生态有效的方法。