Traditional hydrophobic association (HA) hydrogels can obtain excellent mechanical properties in the presence of anionic surfactants. However, such surfactants are sensitive to salt solutions, resulting in large fluctuation of mechanical properties for hydrogels. Here, a combined surfactant consisting of anionic surfactants (sodium dodecyl sulfate, SDS) and amphoteric surfactants (dodecyl dimethyl betaine, BS-12) was successfully introduced into HA hydrogels as stable physical crosslinking points. The resulting SDS/BS-12-HA hydrogels exhibited high tensile stress up to about 700 kPa. Moreover, the hydrogels demonstrated salt-inactive, self-healing and fatigue resistance properties owing to their unique dynamic and reversible physical crosslinking structure. Therefore, it's envisioned that this work may open a new method to develop a soft salt-inactive material with stable and excellent mechanical properties for extending the application range of hydrogels.

在阴离子表面活性剂的存在下，传统的疏水缔合（HA）水凝胶可以获得出色的机械性能。但是，这种表面活性剂对盐溶液敏感，导致水凝胶的机械性能大幅度波动。在这里，由阴离子表面活性剂（十二烷基硫酸钠，SDS）和两性表面活性剂（十二烷基二甲基甜菜碱，BS-12）组成的组合表面活性剂已作为稳定的物理交联点成功引入HA水凝胶中。所得的SDS / BS-12-HA水凝胶表现出高达约700kPa的高拉伸应力。此外，由于其独特的动态和可逆物理交联结构，水凝胶表现出无盐活性，自愈性和抗疲劳性。因此，