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Polymers 2017, 9(3), 98; doi:10.3390/polym9030098

Programming of One- and Two-Step Stress Recovery in a Poly(ester urethane)

1
BAM Federal Institute for Materials Research and Testing, Division 6.5, Polymers in Life Science and Nanotechnology, Unter den Eichen 87, 12205 Berlin, Germany
2
Fraunhofer Institute for Applied Polymer Research IAP, Synthesis and Polymer Technology, Potsdam-Golm, Geiselbergstraße 69, 14476 Potsdam-Golm, Germany
*
Author to whom correspondence should be addressed.
Academic Editor: Jinlian Hu
Received: 3 February 2017 / Revised: 6 March 2017 / Accepted: 6 March 2017 / Published: 10 March 2017
(This article belongs to the Special Issue Functionally Responsive Polymeric Materials)
View Full-Text   |   Download PDF [2404 KB, uploaded 10 March 2017]   |  

Abstract

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. View Full-Text
Keywords: stimuli-sensitive polymer; stress-memory polymer; temperature-memory polymer; shape-memory polymer; poly(ester urethane); programming; thermoresponsiveness; stress recovery; stress memory stimuli-sensitive polymer; stress-memory polymer; temperature-memory polymer; shape-memory polymer; poly(ester urethane); programming; thermoresponsiveness; stress recovery; stress memory
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Mirtschin, N.; Pretsch, T. Programming of One- and Two-Step Stress Recovery in a Poly(ester urethane). Polymers 2017, 9, 98.

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