Vitrimer Transition Phenomena from the Perspective of Thermal Volume Expansion and Shape (In)stability
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In: Macromolecules, Vol. 57.2024, No. 9, 25.04.2024, p. 4246-4253.
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TY - JOUR
T1 - Vitrimer Transition Phenomena from the Perspective of Thermal Volume Expansion and Shape (In)stability
AU - Klingler, Andreas
AU - Reisinger, David
AU - Schlögl, Sandra
AU - Wetzel, Bernd
AU - Breuer, Ulf
AU - Krüger, Jan Kristian
N1 - Publisher Copyright: © 2024 The Authors. Published by American Chemical Society.
PY - 2024/4/25
Y1 - 2024/4/25
N2 - Vitrimers are covalently cross-linked polymers that can be reshaped and recycled, triggered by the temperature. Well above the canonical glass transition temperature Tg, they gain malleable, thermoplastic-like properties; below, they behave as thermosets. The responsible molecular mechanism is enabled by dynamic covalent bond exchange. However, the underlying physics of the transition from thermoplastic to thermoset properties is rather unclear and the subject of current scientific debate. In this work, we address the questions of what extent the temperature-dependent malleability of vitrimers is reflected in the thermal expansion behavior and, conversely, to what extent the thermal expansion behavior is suited to characterize the respective creep behavior of vitrimers. It will be shown that at least in the case of the used model vitrimer, only the canonical glass transition is able to stop the vitrimer to undergo irreversible shape changes and that the often-discussed topology freezing temperature of vitrimers Tv is purely operational.
AB - Vitrimers are covalently cross-linked polymers that can be reshaped and recycled, triggered by the temperature. Well above the canonical glass transition temperature Tg, they gain malleable, thermoplastic-like properties; below, they behave as thermosets. The responsible molecular mechanism is enabled by dynamic covalent bond exchange. However, the underlying physics of the transition from thermoplastic to thermoset properties is rather unclear and the subject of current scientific debate. In this work, we address the questions of what extent the temperature-dependent malleability of vitrimers is reflected in the thermal expansion behavior and, conversely, to what extent the thermal expansion behavior is suited to characterize the respective creep behavior of vitrimers. It will be shown that at least in the case of the used model vitrimer, only the canonical glass transition is able to stop the vitrimer to undergo irreversible shape changes and that the often-discussed topology freezing temperature of vitrimers Tv is purely operational.
UR - http://www.scopus.com/inward/record.url?scp=85191806203&partnerID=8YFLogxK
U2 - 10.1021/acs.macromol.4c00207
DO - 10.1021/acs.macromol.4c00207
M3 - Article
AN - SCOPUS:85191806203
VL - 57.2024
SP - 4246
EP - 4253
JO - Macromolecules
JF - Macromolecules
SN - 0024-9297
IS - 9
ER -
