New Green Hydrogels Based on Lignin.

Area of Science:

• Materials Science
• Polymer Chemistry
• Green Chemistry

Background:

• Lignin, often a waste product, presents significant environmental and economic potential for developing sustainable materials.
• Research into lignin-based hydrogels is limited, highlighting a gap in understanding their synthesis and properties.

Purpose of the Study:

• To investigate the efficacy of lignin as a primary component in novel green hydrogel synthesis.
• To characterize the synthesized lignin-based hydrogels and evaluate their structural and swelling properties.

Main Methods:

• Preparation of hydrogels using steam explosion lignin from aspen wood or epoxy-resin mixed with poly(vinyl alcohol).
• Covalent crosslinking was achieved using epichlorohydrin.
• Characterization involved Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and scanning electron microscopy (SEM).

Main Results:

• Successful synthesis of new green hydrogels incorporating lignin and poly(vinyl alcohol).
• FTIR confirmed intermolecular interactions and cross-linking; XRD revealed structural features.
• SEM images demonstrated a porous hydrogel structure, with pore size increasing with lignin content, and lignin type influenced swelling.

Conclusions:

• Lignin is a viable and promising component for creating sustainable, porous hydrogel materials.
• The synthesis method and lignin characteristics significantly impact hydrogel properties, including swelling behavior.