Quantification of Triple‐Shape Memory Behavior of Polymers Utilizing Tension and Torsion

Abstract

Shape‐memory polymers (SMPs) are well investigated smart materials. With their ability to memorize their original shape they are interesting candidates for a large range of applications. Certain SMPs feature triple shape‐memory behavior. In these cases, it is possible to fix two different temporary shapes. However, the exact quantification of the individual steps regarding their programming and recovery rate is difficult and has not been possible so far. In this work, a novel approach for the analysis and exact quantification of triple SMPs is presented. By applying a customized rheology protocol, it is possible to perform and to analyze torsional and tensional experiments simultaneously. Consequently, different shapes in different directions (vertical and horizontal) can be fixed and the individual steps can be investigated independently at different switching temperatures.

Evaluation of shape memory effect in PLA/copolymers blends

“…To analyze the SME in polymers, torsion tests are also used 5,58,59 . For the analysis in torsion mode (Figure 12) a Solid Rectangular Bar Fixture (SRF) was used.…”

“…To evaluate the SME in torsion mode a Solid Rectangular Bar Fixture (SRF) device was used (Figure 2c). 58,59 The specific procedure was similar to that used for the tension mode. Initially, a sample with dimensions of 54 Â 13.0 Â 3.2 mm was fixed on the SRF device.…”

“…To analyze the SME in polymers, torsion tests are also used. 5,58,59 For the analysis in torsion mode (Figure 12) a Solid Rectangular Bar Fixture (SRF) was used. The chosen switch temperature and strain applied in torsion mode were 80 C and 25%, respectively.…”

Effect of graphene oxide doping on anti-/deicing performance of shape memory epoxy resin

“…In the molecular dynamic simulation, the E-51 polymer chain is synthesized from bisphenol A and epichlorohydrin (see Figure 3 The initial density is 1.5 g/cm 3 . The model size is 49.79×49.79×49.79 Å.…”

“…Shape memory material is a special material that can produce shape recovery by external stimulus [1]. Common stimuli are heat [2][3], electric field [4][5], magnetic field [6][7], acid-base [8], and other external stimulus [9][10]. As an emerging polymer material, shape memory polymer has a wide range of applications in aerospace [11], medical [12][13], and industrial manufacturing [14].…”