Self-assembled topological transition via intra- and inter-chain coupled binding in physical hydrogel towards mechanical toughening

Xing, Ziyu, Li, Zhenghong, Lu, Haibao and Fu, Yong Qing (2021) Self-assembled topological transition via intra- and inter-chain coupled binding in physical hydrogel towards mechanical toughening. Polymer, 235. p. 124268. ISSN 0032-3861

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Official URL: https://doi.org/10.1016/j.polymer.2021.124268

Abstract

Mechanical robustness is one of the challenges for soft hydrogels, which are difficult to repair once fractured, mainly because of their chemical bonds and large binding energies required to heal the fractured surfaces within a reasonable time scale. In this study, an extended Maxwell model is proposed to describe intra-chain ionic bonds and inter-chain hydrogen bonds, coupled in physical hydrogels undergoing self-assembly and mechanical toughening, during both of which the intra-chain and inter-chain bonds are working as sub-entanglement and physical crosslink, respectively. According to the rubber elastic theory, a topology model is formulated to identify the working principle of intra-chain and inter-chain coupled binding in the physical hydrogels. Furthermore, a constitutive stress-strain relationship is developed to understand their self-assembling topology signatures and topological transitions. Finally, effectiveness of the proposed model is verified using molecular dynamic simulations and experimental results of physical hydrogels reported in literature.

Item Type: Article
Additional Information: Funding information: This work was financially supported by the National Natural Science Foundation of China (NSFC) under Grant No. 11725208, International Exchange Grant (IEC/NSFC/201078) through Royal Society UK and the NSFC.
Uncontrolled Keywords: Hydrogel, Self-assembling topology, Intra-chain bond, Inter-chain bond
Subjects: F100 Chemistry
H800 Chemical, Process and Energy Engineering
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User: Elena Carlaw
Date Deposited: 01 Nov 2021 11:09
Last Modified: 02 Nov 2021 10:00
URI: http://nrl.northumbria.ac.uk/id/eprint/47599

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