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Issue 16, 2017
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The shape-memory effect in ionic elastomers: fixation through ionic interactions

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Abstract

Shape-memory elastomers based on a commercial rubber cross-linked by both ionic and covalent bonds have been developed. The elastomeric matrix was a carboxylated nitrile rubber (XNBR) vulcanized with magnesium oxide (MgO) providing ionic interactions that form hierarchical structures. The so-named ionic transition is used as the unique thermal transition responsible for the shape-memory effect (SME) in these elastomers. These ionic interactions fix the temporary shape due to their behavior as dynamic cross-links with temperature changes. Covalent cross-links were incorporated with the addition of different proportions of dicumyl peroxide (DCP) to the ionic elastomer to establish and recover the permanent shape. In this article, the SME was modulated by modifying the degree of covalent cross-linking, while keeping the ionic contribution constant. In addition, different programming parameters, such as deformation temperature, heating/cooling rate, loading/unloading rate and percentage of tensile strain, were evaluated for their effects on shape-memory behavior.

Graphical abstract: The shape-memory effect in ionic elastomers: fixation through ionic interactions

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Publication details

The article was received on 16 Jan 2017, accepted on 22 Mar 2017 and first published on 23 Mar 2017


Article type: Paper
DOI: 10.1039/C7SM00104E
Soft Matter, 2017,13, 2983-2994

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    The shape-memory effect in ionic elastomers: fixation through ionic interactions

    A. González-Jiménez, M. A. Malmierca, P. Bernal-Ortega, P. Posadas, R. Pérez-Aparicio, Á. Marcos-Fernández, P. T. Mather and J. L. Valentín, Soft Matter, 2017, 13, 2983
    DOI: 10.1039/C7SM00104E

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