Yielding mechanisms for mechano-chemo-thermal couplings in amorphous shape memory polymer undergoing molecular entanglement

Liu, Jingyun, Lu, Haibao and Fu, Richard (2021) Yielding mechanisms for mechano-chemo-thermal couplings in amorphous shape memory polymer undergoing molecular entanglement. Journal of Physics D: Applied Physics, 54 (41). p. 415302. ISSN 0022-3727

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Official URL: https://doi.org/10.1088/1361-6463/ac0d29

Abstract

Shape memory polymers (SMPs) have good properties of recovering their original shapes in the presence of an external stimulus. However, their thermodynamic behaviors behind the yielding effects on mechano-chemo-thermal shape-memory effect (SME) are yet explored. In this study, molecular entanglement theory is employed to develop a thermodynamic model in terms of glass transition temperature. Based on the Arrhenius equation and Adam-Gibbs theory, an extended yielding model is formulated to investigate the synergistic coordination of yield stress and stored strain energy on mechano-chemo-thermal SME and relaxation behavior in the amorphous SMPs. Furthermore, effectiveness of this model is demonstrated by applying it to predict thermomechanical and mechano-chemo-thermal shape recovery behaviors of the SMP, and the theoretical results are well validated by the experimental data reported in literature. This study explores the working principle of stored strain energy in terms of molecular entanglement and yield stress, and describes a constitutive relationship between molecular entanglement structure and mechano-chemo-thermal coupling thermodynamics in the amorphous SMP.

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 and the International Exchange Grant (IEC/NSFC/201078) through the Royal Society and NFSC.
Uncontrolled Keywords: shape memory polymer, yield model, thermodynamic, mechano-chemothermal
Subjects: F200 Materials Science
F300 Physics
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User: Rachel Branson
Date Deposited: 12 Jul 2021 15:21
Last Modified: 25 Aug 2021 07:47
URI: http://nrl.northumbria.ac.uk/id/eprint/46657

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