Xu-Ming XieTsinghua Uiversity, China
Professor Xu-Ming Xie graduated with B. Eng from Shinshu University, Japan in 1985. He received his M.Sc. and Ph.D. in Dept. of Organic and Polymeric Materials, Tokyo Institute of Technology, Japan in 1987 and 1990, respectively. From 1990 to 1992, he worked as a research scientist at Kawasaki Plastics Laboratory, Showa Denko, Ltd. (Japan). He has worked at Tsinghua University since 1992, and has been a professor since 1999. His current research areas cover: 1) Structure control and properties of multipolymer systems. 2) Confined crystallization and phase separation of polymer systems. 3) Polymer assisted assembly of lowdimensional nanomaterials and its nanocomposites 4) Polymer grafting and modification. 5) Polymer gels and Super absorbent polymers. He awarded JSPS Visiting Professor Fellowship in 1999 and Georgy. T. Piercy Distinguished Visiting Professor award from Dept. of Chemical Engineering & Materials, University of Minnesota (USA) in 2002. He was also invited as a visiting professor in Chuo University, Japan in 2005. In 2007 he obtained the first “Feng Xinde Polymer Prize” from ELSEVIER. He has over 200 publications in peer-reviewed journals, and 18 patents. He serves as an Associate Editor of 《Engineering mechanical materials》 and Editorial board member of 《Chinese Chemical Letters》, 《Acta Polymerica Sinica》, 《Journal of Functional Polymers》， 《Polymer Materials Science &Engineerig》and 《China Plastics》.
Title：A Novel Strategy for Hierachical cross-linked Network Hydrogels with Super Tough, highly Stretchable and Self-healing Properties
SymposiumB19 Rubber Composites
Starting Time
Ending Time
Abstract
Hydrogels are soft materials with a 3-dimensional network structure, which can retain a significant amount of water. Basically, these soft materials result from the self-assembly of hydrophilic molecules or polymers by forming a covalently or physically cross-linked network. Hydrogels can be potentially used in, e.g., tissue engineering, drug delivery, membrane separation, catalysis, and sensing technology.4–8 Although most hydrogels have good biocompatibility and stimuli-responsivity, they usually have poor mechanical strength and low deformation, which unfortunately set limitations to their high-end applications. Here we propose a facile, one-pot in situ free radical polymerization strategy to prepare self-healable, super tough graphene oxide (GO)/poly(acrylic acid) (PAA) nanocomposite hydrogels by using Fe3+ ions as a cross-linker. The 3-dimensional network structure of the GO/PAA nanocomposite hydrogels is facilitated by dual cross-linking effects through dynamic ionic interactions: (i) first cross-linking points are Fe3+ ions creating ionic cross-linking among PAA chains; (ii) second cross-linking points are GO nanosheets linking PAA chains through Fe3+ coordination. When the GO/PAA nanocomposite hydrogels are under stretching, the ionic interactions among PAA chains can dynamically break and recombine to dissipate energy, while the GO nanosheets coordinated to the PAA chains maintain the configuration of the hydrogels and work as stress transfer centers transferring the stress to the polymer matrix. In this regard, the GO/PAA nanocomposite hydrogels exhibit superior toughness (tensile strength = 777 kPa, work of extension = 11.9 MJ m–3) and stretchability (elongation at break = 2980%). Furthermore, after being treated at 45 oC for 48 h, the cut-off GO/PAA nanocomposite hydrogels exhibit a good self-healing property (tensile strength = 495 kPa, elongation at break = 2470%).
Follow us on WeChat
京公网安备 11010802030754号