Journal
POLYMERS
Volume 9, Issue 3, Pages -Publisher
MDPI
DOI: 10.3390/polym9030098
Keywords
stimuli-sensitive polymer; stress-memory polymer; temperature-memory polymer; shape-memory polymer; poly(ester urethane); programming; thermoresponsiveness; stress recovery; stress memory
Categories
Funding
- German Federal Ministry of Education and Research (BMBF) [16V0043]
- European Regional Development Fund from the European Union [85007031]
Ask authors/readers for more resources
This work demonstrates that phase-segregated poly(ester urethane) (PEU) with switching segments of crystallizable poly(1,4-butylene adipate) (PBA) can be programmed to generate two separate stress recovery events upon heating under constant strain conditions. For programming, two elongations are applied at different temperatures, followed by unloading and cooling. During the adjacent heating, two-step stress recovery is triggered. The results indicate that the magnitude of the stress recovery signals corresponds to the recovery of the two deformation stresses in reverse order. As demonstrated by further experiments, twofold stress recovery can be detected as long as the elongation at higher temperature exceeds the strain level of the deformation at lower temperature. Another finding includes that varying the lower deformation temperature enables a control over the stress recovery temperature and thus the implementation of so-called temperature-memory effects. Moreover, exerting only one elongation during programming enables a heating-initiated one-step stress recovery close to the deformation temperature. Based on these findings, such polymers may offer new technological opportunities in the fields of active assembly when used as fastening elements and in functional clothing when utilized for compression stockings.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available