Extremely stretchable thermosensitive hydrogels by introducing slide-ring polyrotaxane cross-linkers and ionic groups into the polymer network

• Published in: Nature communications 2014-10, Vol.5 (1), p.5124-5124, Article 5124
• Main Authors: Bin Imran, Abu, Esaki, Kenta, Gotoh, Hiroaki, Seki, Takahiro, Ito, Kohzo, Sakai, Yasuhiro, Takeoka, Yukikazu
• Format: Article
• Language: English
• Subjects: 639/301/923/1027; 639/638/455/303; Humanities and Social Sciences; multidisciplinary; Science; Science (multidisciplinary)
• ISSN: 2041-1723; 2041-1723
• DOI: 10.1038/ncomms6124

Stimuli-sensitive hydrogels changing their volumes and shapes in response to various stimulations have potential applications in multiple fields. However, these hydrogels have not yet been commercialized due to some problems that need to be overcome. One of the most significant problems is that conventional stimuli-sensitive hydrogels are usually brittle. Here we prepare extremely stretchable thermosensitive hydrogels with good toughness by using polyrotaxane derivatives composed of α-cyclodextrin and polyethylene glycol as cross-linkers and introducing ionic groups into the polymer network. The ionic groups help the polyrotaxane cross-linkers to become well extended in the polymer network. The resulting hydrogels are surprisingly stretchable and tough because the cross-linked α-cyclodextrin molecules can move along the polyethylene glycol chains. In addition, the polyrotaxane cross-linkers can be used with a variety of vinyl monomers; the mechanical properties of the wide variety of polymer gels can be improved by using these cross-linkers. Stimuli-responsive hydrogels have potential applications in multiple fields; however, a common problem is the brittleness of the resulting structures. Here, the authors report highly stretchable thermosensitive hydrogels by introducing sliding polyrotaxane cross-linkers and ionic groups into the system.