Mechanical Performance and Dye Adsorption of Lignin/Poly(ethylene glycol) Diglycidyl Ether/Sorbitol Polyglycidyl Ether Hydrogels
Yiming Wang, Hailing Liu, Yu-Peng He, Guoqing Guan
TL;DR
This paper introduces a lignin-based hydrogel that can be tuned for mechanical properties and dye removal from water.
Contribution
A lignin hydrogel platform with programmable network density and dye adsorption functionality is developed.
Findings
Hydrogel network density can be controlled by adjusting the SPE fraction.
The hydrogel LS1P9 removed 72% methylene blue from water.
Lignin functions as an active phenolic macromonomer in the hydrogel.
Abstract
A bisphenol-A-free lignin hydrogel platform with programmable network density is reported. Lignin was crosslinked with poly(ethylene glycol) diglycidyl ether (PEGDGE) and sorbitol polyglycidyl ether (SPE) via epoxide ring-opening to generate hydrogel networks spanning eleven PEGDGE/SPE ratios. A single compositional lever—the SPE fraction—allowed the predictable densification of the network, translating into a monotonic shift in swelling and viscoelastic/mechanical responses. Importantly, the well-performing hydrogel (LS1P9) coupled swelling ratio with adsorption functionality, removing 72% methylene blue from water under the tested conditions. This work positions lignin as more than a passive filler: it serves as an active phenolic macromonomer for designing sustainable, multifunctional hydrogels.
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Taxonomy
TopicsLignin and Wood Chemistry · Hydrogels: synthesis, properties, applications · Advanced Cellulose Research Studies