Double-Network Hydrogels with Extremely High Mechanical Strength


  • We thank T. Miyazaki and A. Nakayama for experimental help. We also thank K. Yasuda (Graduate School of Medicine, Hokkaido University) and Dr. M. Ueno (Kyocera Co.) for their help with the pin-and-flat test. This research was financially supported by a Grant-in-Aid for Creative Scientific Research from the Ministry of Education, Culture, Sports, Science and Technology, Japan.


Very strong hydrogels (with a fracture strength of some tens of MPa), as required for both industrial and biomedical applications, have been generated by inducing a double-network (DN) structure for various combinations of hydrophilic polymers. The Figure shows a hydrogel before, during, and after application of a fracture stress of 17.2 MPa.