We prepared moldable materials from lignosulfonate, an industrial lignin derivative, using a combination of ionic crosslinking between lignosulfonate and cationic polyelectrolytes and covalent crosslinking via the Maillard reaction. The mechanical properties of the lignosulfonate/cationic-polyelectrolyte/sugar complex at the optimal composition (stress at break: 55.1 MPa; Young’s modulus: 2791.8 MPa; strain at break: 3%) were comparable to those of poly(phenylene sulfide), which is used as a high-performance engineering plastic. In addition to the good mechanical properties, the lignosulfonate/cationic-polyelectrolyte/sugar complex was water-insoluble, in contrast with the high water solubility of the complex without the reducing sugar. Furthermore, the addition of a reducing sugar (fructose) to the complexes increased adhesion to a metal substrate. These improvements in the mechanical properties, water resistance, and adhesive strength of the lignosulfonate complex will expand the applications of lignosulfonate under high mechanical stress conditions and in water and biobased adhesives.

我们使用木质素磺酸盐和阳离子聚电解质之间的离子交联和通过美拉德反应进行共价交联的组合，从木质素磺酸盐（一种工业木质素衍生物）制备了可模压材料。木质素磺酸盐/阳离子聚电解质/糖复合物在最佳组成（断裂应力：55.1 MPa；杨氏模量：2791.8 MPa；断裂应变：3％）下的机械性能与聚苯硫醚的机械性能相当。用作高性能工程塑料。除了良好的机械性能外，木质素磺酸盐/阳离子-聚电解质/糖复合物是不溶于水的，与没有还原糖的复合物的高水溶性形成对比。此外，向复合物中添加还原糖（果糖）可增加对金属基材的附着力。木质素磺酸盐复合物在机械性能、耐水性和粘合强度方面的这些改进将扩大木质素磺酸盐在高机械应力条件下以及在水和生物基粘合剂中的应用。