Wang Keyan, Qiu Jiajun, Huang Wanyun, Yuan Zhaoyang, Wei Bing, Wen Yangbing
Tianjin Key Laboratory of Pulp and Paper, Tianjin University of Science & Technology, No. 29, 13th Avenue, Tianjin Economic and Technological Development Area, Tianjin 300457, China.
Department of Chemical & Biological Engineering, University of British Columbia, 2360 East Mall, Vancouver, BC V6T 1Z4, Canada; Bioform Technologies, 2366 Main Mall, Vancouver, BC V6T 1Z4, Canada.
Int J Biol Macromol. 2025 Mar;296:139730. doi: 10.1016/j.ijbiomac.2025.139730. Epub 2025 Jan 9.
In this study, we innovatively prepared a multifunctional lignin crosslinked polyacrylamide (L-cPAM) hydrogel by a sequential two-step strategy of crosslinking of lignin and crosslinked polyacrylamide (cPAM) followed by the polymerization of cPAM. The hydrogen bonding and crosslinking between the molecular chains of lignin and PAM established a rigid and porous network structure, which provided the L-cPAM hydrogel with excellent mechanical strength, thermal stability, and salinity resistance. A series of lignin dosages (0 to 30 %) were investigated during the crosslinking of lignin and PAM. The results showed that the mechanical strength of the obtained L-cPAM hydrogel could be increased by 53.6 % to 180.71 kPa at a lignin dosage of 15 %. Moreover, the recovery coefficient of the L-cPAM hydrogel after 20 compressions could be maintained at 85.28 %, indicating a strong shape recovery ability. After crosslinking cPAM with a lignin dosage of 15 %, the initial thermal degradation temperature was substantially increased from 150 °C to 181 °C and the shape of the L-cPAM hydrogel could also be maintained for over 60 days in 21× 10 mg L brine at 150 °C. The results suggested that this work provides a new method to construct high-temperature and high-salinity resistant hydrogels using lignin and polyacrylamide.
在本研究中，我们创新性地采用了两步法策略制备了一种多功能木质素交联聚丙烯酰胺（L-cPAM）水凝胶，即先使木质素与交联聚丙烯酰胺（cPAM）交联，然后进行cPAM的聚合。木质素与聚丙烯酰胺分子链之间的氢键和交联作用形成了刚性且多孔的网络结构，赋予了L-cPAM水凝胶优异的机械强度、热稳定性和耐盐性。在木质素与聚丙烯酰胺交联过程中，研究了一系列木质素用量（0%至30%）。结果表明，当木质素用量为15%时，所得L-cPAM水凝胶的机械强度可提高53.6%，达到180.71 kPa。此外，L-cPAM水凝胶在20次压缩后的回复系数可保持在85.28%，表明其具有很强的形状恢复能力。在用15%木质素交联cPAM后，初始热降解温度从150℃大幅提高到181℃，并且L-cPAM水凝胶的形状在150℃的21×10 mg L盐水中也能保持60多天。结果表明，这项工作为利用木质素和聚丙烯酰胺构建耐高温高盐性水凝胶提供了一种新方法。
