In this study, hydrogels were synthesized through the radical polymerization of hardwood kraft lignin, -isopropylacrylamide, and ,'-methylenebisacrylamide. Statistical analyses were employed to produce lignin-based hydrogels with the highest yield and swelling capacity. The success of the polymerization reactions was confirmed by NMR and Fourier infrared spectroscopy. The lignin-based hydrogel was more thermally and rheological stable, but exhibited less swelling affinity, than synthetic hydrogel. The rheological studies indicated that the swollen hydrogels were predominantly elastic and exhibited a critical solution temperature that was between 34 and 37 °C. Compared with the synthetic hydrogel, lignin-based hydrogel behaved less elastic as temperature increased. In addition to inducing a green hydrogel, the results confirmed that hardwood lignin-based hydrogel would have different properties than synthetic-based hydrogels, which could be beneficial for some applications.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6644411 | PMC |
| http://dx.doi.org/10.1021/acsomega.8b01176 | DOI Listing |
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