3 years ago

Controllable shape-memory recovery regions in polymers through mechanical programming

Controllable shape-memory recovery regions in polymers through mechanical programming
Cheng Zhang, Rui Xiao, Xiaofan Gou
A temperature memory effect means a shape-memory material can remember its deformation temperature. In general, a higher deformation temperature requires a higher activation temperature for shape recovery. In this work, we demonstrate that the unloading temperature can also significantly influence the shape-memory performance. A series of shape-memory tests are performed on Nafion while varying the loading and unloading temperatures. The results show that the loading temperature determines the final shape-recovery region, while the unloading temperature influences the onset recovery region. We also develop a finite-deformation viscoelastic model to investigate the above findings. The simulation results show good agreement with the experimental data, though the model predicts the recovery region occurring at a lower temperature. The model is further used to study the effects of the loading rate, unloading rate, and the holding time on the shape-memory behaviors. The results suggest that a smaller loading rate and unloading rate and a longer holding time can shift the recovery region to a higher temperature. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 45909.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/app.45909

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