Cited by 105Advanced Materials and MechanicsPolymer composites and self-healingPolymer crystallization and properties

Triple-shape properties of a thermoresponsive poly(ester urethane)

Pretsch, Thorsten·2010·Smart Materials and Structures

Abstract

Thermo-mechanical investigations on a segmented poly(ester urethane) have shown that the material displays triple-shape functionality: gradual heating of programmed specimens leads first to the transformation from shape (A) to shape (B) and later from shape (B) back to permanent shape (C). In the essential two-step programming process, the first deformation state (B) is stabilized by crystallized soft segments at T < T c , the second one (A) through the polymer’s glassy state at T < T g . The transition temperatures, as analyzed for the permanent-shaped polymer via DSC, are T g ≈−49 °C and T m (onset)≈34 °C; the material crystallizes when cooled at T c (onset)≈4 °C. For the characterization of the material’s cyclic thermo-mechanical triple-shape properties, maximum deformations of ε m1 = 100% for shape (B) and ε m2 = 130% for shape (A) were tested. In cycles N = 2–5 averaged shape fixing abilities of 74% (shape A, −60 °C), 109% (shape B, 23 °C) and shape recoverabilities of 103% (A B) and 96% (B C) could be detected. Values larger than 100% indicate the occurrence of plastic deformation during the second stretching.

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Crossref · 10.1088/0964-1726/19/1/015006

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  • Several t- and/or m-SMPs systems related to two (or more) distinct switching transition domains have been reported.

    “Up to date, several t- and/or m-SMPs systems related to two (or more) distinct switching transition domains have been reported [64-74].”
  • One-way triple-shape properties can be obtained by two-step programming of an SMP with two well-separated phase transition temperatures or a broad glass transition spanning, for example, 75 °C.

    “Similarly, “one-way” triple-shape properties can be obtained by two-step programming of an SMP with two well-separated phase transition temperatures [55,56] or a broad glass transition, spanning, e.g., over a temperature region of 75 °C [57].”

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Authors
Pretsch, T.
Affiliations
Federal Institute For Materials Research and Testing (DE)
Corresponding author
Pretsch, Thorsten
Venue
Smart Materials and Structures
Published
2009-11-19
Volume
19
Issue
1
Pages
015006
ISSN
  • 0964-1726 (ISSN-L)
  • 1361-665X
OpenAlex
W2005248260
Cited by
105
References
30
Citations by year
2026: 1 · 2025: 1 · 2024: 1 · 2023: 1 · 2022: 5 · 2021: 4 · 2020: 6 · 2019: 8 · 2018: 2 · 2017: 6 · 2016: 3 · 2015: 9 · 2014: 7 · 2013: 11 · 2012: 18
FWCI
26.05
Type
journal article
Language
en
Open access
closed
Locations
Smart Materials and Structures (publishedVersion)
Funders
Bayer
Topics
  • Physical Sciences › Engineering › Mechanical Engineering › Advanced Materials and Mechanics
  • Physical Sciences › Materials Science › Polymers and Plastics › Polymer composites and self-healing
  • Physical Sciences › Materials Science › Polymers and Plastics › Polymer crystallization and properties
Keywords
thermoresponsive polymers, polyester polyurethane, shape memory polymers, segmented polymers, soft segment crystallization, glass transition, plastic deformation

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