A thermoviscoelastic constitutive model for crosslinked semicrystalline two-way shape memory polymers.
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| Title: | A thermoviscoelastic constitutive model for crosslinked semicrystalline two-way shape memory polymers. |
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| Authors: | Tian, Jie1 (AUTHOR), Xie, Jianguo2 (AUTHOR), Shi, Jiawen1 (AUTHOR), Gu, Jianping3 (AUTHOR), Sun, Huiyu4 (AUTHOR) zenghao@njtech.edu.cn, Zeng, Hao1,2,4,5 (AUTHOR) zenghao@njtech.edu.cn |
| Source: | International Journal of Smart & Nano Materials. Sep2025, Vol. 16 Issue 3, p667-694. 28p. |
| Subjects: | Shape memory effect, Viscoelasticity, Crosslinked polymers, Phase transitions, Ethylene-vinyl acetate, Multiscale modeling |
| Abstract: | The paper proposed a thermodynamically consistent 3D constitutive framework for crosslinked semi-crystalline polymers, explicitly addressing the interplay between crystallization/melting-induced phase transitions and viscoelasticity under complex thermomechanical cycles. By integrating a modified theory of multiple natural configurations with a revised time-temperature superposition principle (TTSP), the model captures both one-way and two-way shape memory effects (1W/2W-SMEs). An experimental campaign on crosslinked ethylene-vinyl acetate (EVA) with controlled crosslink densities combines multi-rate DSC analysis, frequency-sweep DMA, and coupled stress-strain-temperature protocols to quantify the dynamic evolution of crystallinity and viscoelastic moduli. Crucially, a modified WLF-Arrhenius hybrid equation is introduced to describe nonlinear stress relaxation mechanisms, validated through master curve construction from TTSP tests. The model successfully predicts recovery behaviors in free 1W-SMEs and stress-rate hysteresis in 2W-SMEs, demonstrating its capability to bridge molecular-scale phase transitions to macroscopic uniaxial responses. This work provides a unified tool for designing programmable soft actuators and smart devices. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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| Abstract: | The paper proposed a thermodynamically consistent 3D constitutive framework for crosslinked semi-crystalline polymers, explicitly addressing the interplay between crystallization/melting-induced phase transitions and viscoelasticity under complex thermomechanical cycles. By integrating a modified theory of multiple natural configurations with a revised time-temperature superposition principle (TTSP), the model captures both one-way and two-way shape memory effects (1W/2W-SMEs). An experimental campaign on crosslinked ethylene-vinyl acetate (EVA) with controlled crosslink densities combines multi-rate DSC analysis, frequency-sweep DMA, and coupled stress-strain-temperature protocols to quantify the dynamic evolution of crystallinity and viscoelastic moduli. Crucially, a modified WLF-Arrhenius hybrid equation is introduced to describe nonlinear stress relaxation mechanisms, validated through master curve construction from TTSP tests. The model successfully predicts recovery behaviors in free 1W-SMEs and stress-rate hysteresis in 2W-SMEs, demonstrating its capability to bridge molecular-scale phase transitions to macroscopic uniaxial responses. This work provides a unified tool for designing programmable soft actuators and smart devices. [ABSTRACT FROM AUTHOR] |
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| ISSN: | 19475411 |
| DOI: | 10.1080/19475411.2025.2540296 |
