Open AccessPreparation and Properties of Hydrogels Based on PEGylated Lignosulfonate Amine
Author(s) -
Xiaoxu Teng,
Huaizhe Xu,
Wenjia Song,
Jianwei Shi,
Junna Xin,
William C. Hiscox,
Jinwen Zhang
Publication year - 2017
Publication title -
acs omega
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.779
H-Index - 40
ISSN - 2470-1343
DOI - 10.1021/acsomega.6b00296
Subject(s) - self healing hydrogels , lignin , fourier transform infrared spectroscopy , diglycidyl ether , ethylene glycol , swelling , polymer chemistry , epoxy , chemistry , chemical engineering , swelling capacity , amine gas treating , nuclear chemistry , materials science , organic chemistry , bisphenol a , composite material , engineering
Sodium lignosulfonate (SLS) was aminated to obtain a lignin amine (LA) compound, which was subsequently crosslinked with poly(ethylene glycol) diglycidyl ether (PEGDGE) to obtain hydrogels. The chemical structure of the resulting LA-derived hydrogel (LAH) was characterized by Fourier transform infrared (FTIR) spectroscopy, solid-state 13 C NMR spectroscopy, and elemental analysis, and the interior morphology of the freeze-dried hydrogel was examined by scanning electron microscopy. NMR and FTIR spectroscopy results indicated that the amino groups of LA reacted with PEGDGE in the crosslinking reaction. The lignin content in the resulting hydrogel increased with an increase in the LA/PEGDGE weight ratio in the reaction, approaching a maximum (∼71 wt %) and leveling off. The hydrogel with such a composition happened to be the same as the one prepared by reacting the primary amines of LA and epoxy groups of PEGDGE in equal stoichiometry. These results strongly suggest that the formation of the hydrogel network structure was largely dictated by the reactions between the primary amines and epoxy groups. The gels with lignin contents at this level exhibited a superior swelling capacity, viscoelasticity, and shear properties.