57. [Macromol Mater Eng] Highly mechanical and fatigue resistant double network hydrogels by dual physically hydrophobic association and ionic crosslinking
作者：Baoyuan Zhang, Zijian Gao, Guanghui Gao, Wei Zhao, Jiasheng Li, Xiuyan Ren*
關鍵字：Highly mechanical and fatigue resistant double network hydrogels
論文來源：期刊
具體來源：Macromolecular Materials and Engineering
發表時間：2018年
Double network (DN) hydrogels with high strength and toughness are considered as promising soft materials. Herein, we explored a dual physically cross-linked HPAAm/Alginate-Ca2+ DN hydrogel, consisting of hydrophobic association polyacrylamide (HPAAm) network and Ca2+ cross-linked alginate network. The HPAAm/Alginate-Ca2+ DN hydrogel exhibits excellent mechanical properties with the fracture stress of 1.16 MPa (3.0 and 1.7 times higher than that of HPAAm hydrogel and HPAAm/Alginate hydrogel, respectively), fracture strain of 2604%, elastic modulus of 71.79 kPa, and toughness of 14.20 MJ m-3. HPAAm/Alginate-Ca2+ DN hydrogels also demonstrate self-recovery, notch-insensitivity and fatigue resistance properties without any external stimuli at room temperature through reversible physical bonds consisting of hydrophobic association and ionic crosslinking. As a result, the dual physical crosslinking would offer an avenue to design DN hydrogels with desirable properties for broadening current applications of soft materials.