Shape memory epoxies based on networks with chemical and physical crosslinks |
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Authors: | Agustina B Leonardi Laura A Fasce Ileana A Zucchi Cristina E Hoppe Ezequiel R Soulé Claudio J Pérez Roberto JJ Williams |
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Institution: | Institute of Materials Science and Technology (INTEMA), University of Mar del Plata and National Research Council (CONICET), J.B. Justo 4302, 7600 Mar del Plata, Argentina |
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Abstract: | Epoxies are an important family of shape memory polymers (SMP) due to their excellent stability and thermo-mechanical endurance and the high values of shape fixity and shape recovery. Actuators based on these materials can be designed for large tensile elongations (e.g., 75% or higher) or large recovered stresses (e.g., 3 MPa or higher). However, meeting these requirements simultaneously is a difficult task because changes in the crosslink density affect both variables in opposite ways. We show that an SMP based on an epoxy network with both chemical and physical crosslinks could be strained up to 75% in four repeated shape memory cycles with tensile stresses close to 3 MPa. Shape fixity and shape recovery values were close to 98% and 96%, respectively, for everyone of the cycles, without any significant change between the first and subsequent cycles. |
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Keywords: | Epoxy networks Physical crosslinks Shape memory epoxies SMP (shape memory polymers) |
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