Synthesis and characterization of aminated Lignin-based Hydrogel

Conversion of renewable and sustainable materials to valuable products is a known way to replace synthetic polymers with natural polymers. lignin is a bio-renewable material and it is the second most abundant biopolymer from biomass. In this work, lignin-based hydrogel was synthesized by crosslinking reactions between dialdehyde cellulose and aminated lignin. Lignin was subjected to amination by Mannich reaction and cellulose was oxidized by sodium metaperiodate, which has been confirmed by FTIR spectroscopy too. The FTIR spectroscopy of the produced hydrogel showed that aldehyde groups of oxidized cellulose react with the amino groups of aminated lignin through a Schiff base, which provide the successfully crosslinking for construction of a hydrogel network. SEM revealed a porous architecture of hydrogel with different pore size distributions. The surface Properties of hydrogel was determined by BET analysis, which indicated the internal porosity of the hydrogel. The results confirmed that the aminated lignin-based hydrogel prepared in this research is a sustainable green hydrogel, which would be beneficial for different applications.Conversion of renewable and sustainable materials to valuable products is a known way to replace synthetic polymers with natural polymers. Lignin, bio-renewable material, is the second most abundant biopolymer from biomass. In this work, the lignin-based hydrogel was synthesized by crosslinking reactions between dialdehyde cellulose and aminated lignin. So lignin was subjected to amination by Mannich reaction and cellulose was oxidized by sodium metaperiodate, which has been confirmed by FTIR spectroscopy results. The FTIR spectroscopy of the produced hydrogel showed that aldehyde groups of oxidized cellulose react with the amino groups of aminated lignin through a Schiff base, which provides the successful crosslinking for the construction of a hydrogel network. SEM revealed a porous architecture of hydrogel with different pore size distributions. The surface properties of hydrogel were determined by BET analysis, which indicated the internal porosity of the hydrogel. The results confirmed that the aminated lignin-based hydrogel prepared in this research was a sustainable green hydrogel, which would be beneficial for different applications (hygiene, agriculture, etc).