A polycaprolactone‐based syntactic foam with bidirectional reversible actuation

Abstract

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A Thermoset Shape Memory Polymer-Based Syntactic Foam with Flame Retardancy and 3D Printability

“…The peak here is broadened and shifted a little bit toward the lower wavenumber which may also indicate hydrogen-bonding interaction between the filler HGMs and the polymer matrix 51 − 53 The peaks in the range 1600–1800 cm –1 are related to the carbonyl stretching, and the shoulder around 1720 cm –1 may have resulted from carbonyl stretching in the amorphous domain. 28 The peak at 1450 cm –1 corresponds to the C=C stretching and CH 3 deformation vibration mode. Another peak has been observed within the range 700–800 cm –1 which may be related to the C=C groups.…”

“…In addition to the one-way shape memory polymer-based syntactic foam, Lu et al have investigated the reversible bidirectional actuation behavior of a two-way SMP-based syntactic foam which enables applications in different fields such as soft robots, biomedical devices, sealants, and so on. 28 Prima et al have studied the thermomechanical storage and recovery behavior of thermoset SMP foams under different deformation conditions. 29 Moreover, when the programmed shape of SMPs is partially or fully confined during recovery, it can generate a force.…”

Shape-Memory Polymeric Artificial Muscles: Mechanisms, Applications and Challenges

“…The CIE-MIC transformation for the semi-crystalline networks requires the presence of an external force. Furthermore, the cross-link density is considered a tailoring parameter to control the quasi two-way shape-memory response [ 46 , 47 , 48 , 49 ]. If we look back at the mechanism of LCE, the anisotropic alignment of the polymer chain is the true inherent mechanism for the semi-crystalline polymer network.…”

Supercritical CO2blown poly(ε-caprolactone) covalent adaptable networks towards unprecedented low density shape memory foams

“…Until now, foaming processes rather include microwave assisted solvent foaming, high internal phase emulsion, particle leaching or glass microsphere incorporation when the preparation of porous PCL covalent networks is foreseen. 33,[35][36][37][38][39] Introducing adaptable crosslinks in polymer materials allows today to resolve the intersection between thermoplastics and thermosets. 40,41 Advantageously, shape-memory polymers based on covalent adaptable networks (CAN) have emerged since they remarkably combine efficient shape memory properties with reconfiguration and/or recycling capabilities.…”