Jiang Zuming, Guo Lanlei, Yuan Fuqing, Wang Jinquan, Jiang Xiancai
Exploration and Development Research Institute of Shengli Oilfield, SINOPEC, Dongying 257015, China.
School of Chemical Engineering, Fuzhou University, Fuzhou 350108, China.
Int J Biol Macromol. 2021 Sep 1;186:952-961. doi: 10.1016/j.ijbiomac.2021.07.026. Epub 2021 Jul 6.
Simultaneously achieving good mechanical properties and high tolerance to hot and cold environments in hydrogel materials remains a challenge. In this work, ethylene glycol (EG) and cellulose nanofibrils (CNFs) were introduced into chitosan/poly(acrylamide-acrylic acid) double-network hydrogels to improve their toughness and tolerance to hot and cold environments. The effect of EG and CNFs on the properties of the hydrogels was studied respectively. EG increases the tolerance of the hydrogel to hot and cold environments. However, EG had a negative effect on the mechanical properties of hydrogels. In addition, CNFs substantially enhanced the strength and toughness of the chitosan/poly(acrylamide-acrylic acid)/EG organohydrogels. Finally, with the cooperative action of EG and CNFs, high-strength and tough organohydrogels (tensile strength = 0.71 MPa, elongation at break = 787.2%) with a high tolerance to hot and cold environments (-23 °C to 60 °C) were obtained. Further, EG enabled the organohydrogel to revert to its original state after drying at 60 °C. This paper provides a new route to prepare high-strength and tough organohydrogels with a high tolerance to hot and cold environments.
在水凝胶材料中同时实现良好的机械性能以及对热和冷环境的高耐受性仍然是一项挑战。在这项工作中，将乙二醇（EG）和纤维素纳米纤维（CNF）引入壳聚糖/聚（丙烯酰胺-丙烯酸）双网络水凝胶中，以提高其韧性和对热和冷环境的耐受性。分别研究了EG和CNF对水凝胶性能的影响。EG提高了水凝胶对热和冷环境的耐受性。然而，EG对水凝胶 的机械性能有负面影响。此外，CNF显著增强了壳聚糖/聚（丙烯酰胺-丙烯酸）/EG有机水凝胶的强度和韧性。最后，在EG和CNF的协同作用下，获得了对热和冷环境（-23°C至60°C）具有高耐受性的高强度和韧性有机水凝胶（拉伸强度=0.71MPa，断裂伸长率=787.2%）。此外，EG使有机水凝胶在60°C干燥后能够恢复到其原始状态。本文提供了一种制备对热和冷环境具有高耐受性的高强度和韧性有机水凝胶的新途径。
