Assessment of controllable shape transformation, potential applications, and tensile shape memory properties of 3D printed PETG

• DOI: 10.1016/j.jmrt.2022.04.076
• Publication Date: 2022-04-22T16:02:35Z
• Authors: E. Soleyman; M. Aberoumand; D. Rahmatabadi; K. Soltanmohammadi; I. Ghasemi; M. Baniassadi; K. Abrinia; M. Baghani
• Keywords: Shape-memory polymer; 3d printed

In this research, for the first time, highly controllable self-coiling and tensile shape memory behaviors of 3D printed (Poly-Ethylene Terephthalate Glycol) PETG thermoplastic structures, as a novel polymer (SMP), are introduced. The results showed that maximum printing-induced pre-strain is stored in layer. Manipulating infill printing direction strip provides different transformation modes, including bending spiraling. wall effect experiments indicated related to pattern weakens by increasing size. Employing cross resulted strip's more intense self-spiraling behavior, making final mode less influenced planar rectangular surfaces with single patterns caused self-tubing half full tubes, respectively. Mechanical biomedical potential applications parts' defined self-deployable spiral stent, self-conforming supporting splint, mechanical fastening, self-locking planarly gripper grab spherical, slippery, soft objects hard grab. test was done on dog-bone sample evaluate layer's direction, programming temperature, strain rate performance. Hot programmed samples (Tg+10 °C) exhibited higher fixity weaker recovery than warm (Tg). Warm considerable downward self-bending their recovered shape, but hot did not show any curvature. This behavior intensifies stretching percentage. Also, changing from longitudinal transverse condition prevented during process. A twentyfold increase deformation speed doubled gentler undesired 14.3% recovery.