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Influence of Holding Time on Shape Recovery in a Polyurethane Shape-Memory Polymer

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Abstract

Shape-memory polymers have attracted a lot of interest in recent years. A shape-memory polymer can be deformed and fixed into a temporary shape and subsequently made to recover its original shape when a suitable stimulus is applied. This is accomplished by means of a thermomechanical cycle called programming. Programming can be performed in a stress- or strain-controlled mode. The thermomechanical conditions of the programming affect shape-memory properties differently in each programming mode. One of the parameters which significantly affects shape-memory properties in a stress-controlled procedure is stress-holding time (t H) at high temperature. This paper studies how stress-holding time affects the most significant shape-memory properties under successive thermomechanical cycles. The experiments were conducted using two different programming temperatures in the vicinity of the T g. The shape-recovery ratio decreased dramatically with cycling even when the holding time was just a few seconds, however, the impact of the stress-holding time depends on the temperature at which it has been applied. Shape-fixity ratio and switching temperature were also studied, but stress-holding time and successive cycles do not seem to affect either of these factors.

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Acknowledgments

The authors would like to thank MINECO (MAT2011-27039-C03-01, MAT2011-27039-C03-02) for giving financial support.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Universitat Rovira i Virgili, Av. Països Catalans 26, 43007, Tarragona, Spain

    David Santiago, Francesc Ferrando & Silvia De la Flor

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  1. David Santiago
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  2. Francesc Ferrando
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  3. Silvia De la Flor
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Correspondence to Silvia De la Flor.

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Santiago, D., Ferrando, F. & De la Flor, S. Influence of Holding Time on Shape Recovery in a Polyurethane Shape-Memory Polymer. J. of Materi Eng and Perform 23, 2567–2573 (2014). https://doi.org/10.1007/s11665-014-0997-5

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  • DOI: https://doi.org/10.1007/s11665-014-0997-5

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