

FOLLOWUS
Laboratory of Advanced Materials (Ministry of Education), Department of Chemical Engineering, Tsinghua University, Beijing 100084, China
Xu-ming Xie (谢续明), E-mail:xxm-dce@mail.tsinghua.edu.cn
Received:09 April 2017,
Revised:2017-5-5,
Accepted:08 May 2017,
Published:05 October 2017
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Xiao-ying Liu, Ming Zhong, Fu-kuan Shi, et al. Multi-bond Network Hydrogels with Robust Mechanical and Self-healable Properties[J]. Chinese Journal of Polymer Science, 2017, 35(10): 1253-1267.
Xiao-ying Liu, Ming Zhong, Fu-kuan Shi, et al. Multi-bond Network Hydrogels with Robust Mechanical and Self-healable Properties[J]. Chinese Journal of Polymer Science, 2017, 35(10): 1253-1267. DOI: 10.1007/s10118-017-1971-0.
Multi-bond network (MBN) which contains a single network with hierarchical cross-links is a suggested way to fabricate robust hydrogels. In order to reveal the roles of different cross-links with hierarchical bond energy in the MBN
here we fabricate poly(acrylic acid) physical hydrogels with dual bond network composed of ionic cross-links between carboxyl-Fe
3+
interactions and hydrogen bonds
and compare these dually cross-linked hydrogels with singly and ternarily cross-linked hydrogels. Simple models are employed to predict the tensile property
and the results confirm that the multi-bond network with hierarchical distribution in the bond energy of cross-links endows hydrogel with effective energy-dissipating mechanism. Moreover
the dually cross-linked MBN gels exhibit excellent mechanical properties (tensile strength up to 500 kPa
elongation at break~2400%) and complete self-healing after being kept at 50℃ for 48 h. The factors on promoting self-healing are deeply explored and the dynamic multi-bonds are regarded to trigger the self-healing along with the mutual diffusion of long polymer chains and ferric ions.
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