Composite hydrogel membrane with high mechanical strength for treatment of dye pollutant

Wang, Chao; Zhou, Guanlin; Wang, Xiaosong; Liu, Jinguo; Li, Dong; Wu, Chengwei; Zhang, Wei

doi:10.1016/j.seppur.2021.119154

Cited by 16 publications

(1 citation statement)

References 43 publications

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“…(a) Stress–strain curve of different concentrations of Al 3+ in a hydrogel and PAM (inset). (b) Comparison of the strength of wood/PAM-Al 3+ and other hydrogels. ,,,,− (c) SEM images and EDS images of wood/PAM-Al 3+ in the transverse section. The state of wood/PAM-Al 3+ under transverse bending (d), longitudinal bending (e), torsion (f), and folding (g).…”

Section: Resultsmentioning

confidence: 99%

High-Strength, High-Swelling-Resistant, High-Sensitivity Hydrogel Sensor Prepared with Wood That Retains Lignin

Meng,

Zhou,

Jin

et al. 2024

Biomacromolecules

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Wood-derived hydrogels possess satisfactory longitudinal strength but lack excellent swelling resistance and dry shrinkage resistance when achieving high anisotropy. In this study, we displayed the preparation of highly dimensional stable wood/ polyacrylamide hydrogels (wood/PAM-Al 3+ ). The alkali-treated wood retains lignin as the skeleton of the hydrogel. Second, Al ions were added to the metal coordination with lignin. Finally, by employing free radical polymerization, we construct a conductive electronic network using polyaniline within the wood/PAM-Al 3+ matrix to create the flexible sensor. This approach leverages lignin's integrated structure within the middle lamella to provide enhanced swelling resistance and stronger binding strength in the transverse direction. Furthermore, coordination between lignin and Al ions improves the mechanical strength of the wood hydrogel. Polyaniline provides stable linear pressure and temperature responses. The wood/PAM-Al 3+ exhibits a transverse swelling ratio of 3.90% while achieving a longitudinal tensile strength of 20.5 MPa. This highstrength and high-stability sensor is capable of monitoring macroscale human behavior. Therefore, this study presents a simple yet innovative strategy for constructing tough hydrogels while also establishing an alternative pathway for exploring lignin networks in new functional materials development.

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