writer：Jianyu Xu, Ziwen Fan, Lijie Duan,?Guanghui Gao*
keywords：tough, stretchable and extensively sticky hydrogel
source：期刊
specific source：Polymer Chemistry
Issue time：2018年
For hydrogels, toughness and adhesiveness are contradictable. However, the simultaneous requirement for both was very urgent in some practical applications, such as robotics joints, wound dressing and surgical bandage. Here in, milk casein as a protein model was introduced into polyacrylamide (PAAm) hydrogel, which could achieve adequate adhesiveness and mechanical strength. Surprisingly, casein-PAAm hydrogel could adhere repeatedly to the surface of various solid materials and biological tissues by possible physical interactions. The result exhibited the maximum peeling force of 378 N/m for casein-PAAm hydrogel at the aluminum surface. Moreover, casein-PAAm hydrogel had adequate mechanical performance with fracture stress of 180 kPa at fracture strain of 2000%. Therefore, the strategy based on tough and adhesive hydrogels assisted by protein would broaden the direction to fabricate a new generation of soft materials with multiple adhesive properties and tough mechanical properties.