Zheng Qi, Nong Guangzai, Li Ning
School of Resources, Environment and Materials, Guangxi University, Nanning 530004, China.
Polymers (Basel). 2024 Apr 28;16(9):1237. doi: 10.3390/polym16091237.
Lignin is insoluble in water, thereby limiting its use in the synthesis of adhesives. Therefore, in this study, an aminated lignin compound was prepared through a lignin amination reaction to increase the amount of raw lignin material that can be used in the synthesis of adhesives; moreover, structural analysis was conducted. The main result of this was the introduction of amino groups into phenolic hydroxyl groups in the hydrolyzing lignin from the raw lignin materials, thus generating the product of aminated lignin. The resulting particle sizes were about 100 nm, the average molecular weight was 57,627 g/mol, and the water solubility of the aminated lignin was about 0.45 g/100 mL. Therefore, the water solubility of raw lignin was greatly improved. The proposed reaction mechanism of phenolic hydroxyl groups and carboxylic acid groups in lignin is a reaction with ammonia molecules; thus, the successful introduction of amino groups generated the aminated lignin compounds. Hence, this article enriches the scientific theory of lignin reactions and provides a reference for the widespread application of raw lignin materials in the field of adhesives.
木质素不溶于水，因此限制了其在胶粘剂合成中的应用。因此，在本研究中，通过木质素胺化反应制备了一种胺化木质素化合物，以增加可用于胶粘剂合成的原始木质素原料的用量；此外，还进行了结构分析。主要结果是将氨基引入到原始木质素原料水解木质素的酚羟基中，从而生成胺化木质素产物。所得粒径约为100nm，平均分子量为57627g/mol，胺化木质素的水溶性约为0.45g/100mL。因此，原始木质素的水溶性得到了极大提高。木质素中酚羟基和羧酸基团的反应机理是与氨分子发生反应；因此，氨基的成功引入生成了胺化木质素化合物。因此，本文丰富了木质素反应的科学理论，为原始木质素原料在胶粘剂领域的广泛应用提供了参考。
