Wang Caihong, Guan Xiaoqin, Yuan Yongli, Wu Yong, Tan Shuai
School of Chemical Engineering, Sichuan University No. 24 South Section 1, Yihuan Road Chengdu 610065 China
RSC Adv. 2019 Sep 3;9(47):27640-27645. doi: 10.1039/c9ra05201a. eCollection 2019 Aug 29.
A series of ionic compounds 1,-dialkyl-3,3'-bis-l-vinylimidazolium bromide (C VIM) are prepared and employed to crosslink acrylamide for polyacrylamide (PAAM) hydrogel preparation solution polymerization. The swelling behavior, mechanical properties and thermal stability of the prepared C VIM crosslinked PAAM hydrogels are investigated. C VIM effectively crosslink the PAAM networks to form porous structures in the hydrogel, which could stably absorb water as much as 75.9 fold in weight without structural degradation. The prepared hydrogels could endure compressive stress up to 1.95 MPa and compressive deformation more than 90%. Meanwhile, the C VIM crosslinked networks show superior thermal stability, and could retain the structural integrity under 150 °C for more than 240 h. The swelling degradation resistance, mechanical strength and thermal stability of C VIM crosslinked hydrogels are much better than those of a conventional ,'-methylenebisacrylamide crosslinked PAAM hydrogel. Using bis-vinylimidazolium bromides as crosslinkers provides an optional strategy for constructing thermally and mechanically robust hydrogel networks.
制备了一系列离子化合物1, -二烷基-3, 3'-双-1-乙烯基咪唑鎓溴化物（CₓVIM），并将其用于交联丙烯酰胺以通过溶液聚合制备聚丙烯酰胺（PAAM）水凝胶。研究了所制备的CₓVIM交联PAAM水凝胶的溶胀行为、力学性能和热稳定性。CₓVIM有效地交联PAAM网络，在水凝胶中形成多孔结构，该结构能够稳定地吸收高达其重量75.9倍的水而不发生结构降解。所制备的水凝胶能够承受高达1.95 MPa的压缩应力和超过90%的压缩变形。同时，CₓVIM交联网络表现出优异的热稳定性，并且在150℃下可保持结构完整性超过240小时。CₓVIM交联水凝胶的抗溶胀降解性、机械强度和热稳定性远优于传统的N, N'-亚甲基双丙烯酰胺交联的PAAM水凝胶。使用双乙烯基咪唑鎓溴化物作为交联剂为构建热稳定和机械稳定的水凝胶网络提供了一种可选策略。
