A remote-activated shape memory polymer network employing vinyl-capped Fe₃O₄ nanoparticles as netpoints for durable performance

A new type of shape memory polymer (SMP) employing vinyl-capped Fe₃O₄ nanoparticles as netpoints that determine the permanent shape for remote activation has been presented. The new design effectively prevents the nanoparticles from moving and re-aggregating in a polymer matrix and guarantees the stability of the SMP networks when a high temperature and external stress are applied. Therefore, durable shape memory performance is obtained during the programmed deformation-recovery processes. Meanwhile, a homogeneous distribution of vinyl-capped Fe₃O₄ nanoparticles achieves uniform heat generation and heat transfer in the alternating magnetic field. Consequently, the novel remote-activated SMP also exhibits a fast magnetic responsiveness compared to the SMPs physically dispersed with Fe₃O₄ nanoparticles. (paper)