文献类型：期刊文献

英文题名：Ultra stretchable, tough and self-healable poly(acrylic acid) hydrogels cross-linked by self-enhanced high-density hydrogen bonds

作者：Zhang, Rui[1,2];Fu, Qionglong[1];Zhou, Keming[1];Yao, Yuan[3];Zhu, Xuedong[1]

机构：[1]East China Univ Sci & Technol, Engn Res Ctr Large Scale Reactor Engn & Technol, Sch Chem Engn, Minist Educ, 130 Meilong Rd, Shanghai 200237, Peoples R China;[2]East China Normal Univ, Sch Chem & Mol Engn, Shanghai Key Lab Green Chem & Chem Proc, Shanghai 200062, Peoples R China;[3]East China Univ Sci & Technol, Sch Mat Sci & Engn, Shanghai 200237, Peoples R China

年份：2020

卷号：199

外文期刊名：POLYMER

收录：;EI(收录号：20202108685060);WOS:【SCI-EXPANDED(收录号:WOS:000538143600015)】；

基金：This work is supported by National Natural Science Foundation of China (21374029, 51573088, 21776076). This work was supported by the Open Research Fund of Shanghai Key Laboratory of Green Chemistry and Chemical Processes, East China Normal University.

语种：英文

外文关键词：Hydrogel; Hydrogen bonded micelles; Ultra-stretching; Self-healing; Conductivity

摘要：Hydrogen bond cross-linked hydrogels are generally not able to combine ultra-high stretchability and toughness, because water molecules can weaken the strength of hydrogen bonds. Herein, we report a strategy of introducing high-density hydrogen-bonded micelles to prepare poly(acrylic acid) (PAA) hydrogels named PAA/LTL/MT hydrogel. The micelle cross-linker (assembled from triblock polymer, LTL) was composed of dense hydrogen bond core: Poly(ether-thioureas) with triethylene glycol, and hydrophilic shell: Poly(L-lysine). Meanwhile, methacrylized poly(ether-thioureas) (MT) was embedded in the micelles to further increase the density of hydrogen bond. As a result, the micelle cross-linked hydrogels exhibited remarkable mechanical performance, including ultra stretchability and toughness, the maximum fracture strain, true fracture stress and toughness were 7800%, 4.80 MPa and 1.73 MJ/m(3), respectively. Moreover, the dense hydrogen bonds endow hydrogels with great self-healing ability and good conductivity. The combined properties of PAA/LTL/MT hydrogel endow it to be a promising candidate for bio-sensors.