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- W4387618178 abstract "The purpose of this study is to present a nonequilibrium dynamic model for investigating the heterogeneous relaxation mechanism underlying the multi-shape memory effect (multi-SME) in amorphous polymers. By incorporating the concept of phase transition into the Gibbs–DiMarzio lattice model, a time-dependent hole distribution function is developed to characterize the heterogeneous dynamics and complex viscoelastic responses of multi-shape memory polymers (multi-SMPs) for the first time. The proposed formulation is employed in a multi-SME cycle under different thermomechanical loading histories. The excellent agreement between the numerical predictions and the available experimental results demonstrates the capability of the proposed approach to investigate dynamic heterogeneity and collective motion in multi-SMPs. The effects of the heating method, hole formation energy, and loading frequency on the relaxation spectrum and thermomechanical behavior of multi-SMPs are further investigated using the proposed model. It is found that the heterogeneous distribution and dynamical fluctuation of the holes in Nafion multi-SMPs lead to a broad glass transition range from 328 to 413 K. This study is expected to provide theoretical guidance for the design of amorphous polymers with tunable multi-SMEs, thereby facilitating practical applications." @default.
- W4387618178 created "2023-10-14" @default.
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- W4387618178 date "2023-10-13" @default.
- W4387618178 modified "2023-10-15" @default.
- W4387618178 title "Spatially Heterogeneous Dynamics in Multi-Shape Memory Polymers Undergoing Broad Glass Transitions" @default.
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- W4387618178 doi "https://doi.org/10.1021/acs.macromol.3c00621" @default.
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