PEREZ Claudio Javier
shape memory epoxies based on networks with chemical and physical crosslinks
A.B. LEONARDI, L.FASCE, I. ZUCCHI, C. HOPPE, E. SOULE, C. J. PÉREZ, R.J.J. WILLIAMS
EUROPEAN POLYMER JOURNAL
PERGAMON-ELSEVIER SCIENCE LTD
Año: 2011 vol. 47 p. 362 - 362
Epoxy are an important family of shape memory polymers (SMP) due to their excellent stabilbity and thermo-mechanical endurance and the high value of shape fixity and shape recovyery. 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. Whe 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.