Production of magnetic shape memory alloy/shape memory polymer blend composites, investigation of the changing physical properties of the produced composites

Nowadays, materials with a combination of magnetic and flexible properties are an important group of materials for industrial applications that respond to magnetic fields. Moreover, the fact that these materials exhibit smart material properties also increases the interest in the application areas of the material. In this thesis, shape-memory NiMnSb/NiMnCoSb alloys and PLA/PHA composite films with magnetic, flexible and smart properties were prepared by solution casting method. Some measurements were made respectively. The effect of magnetic shape-memory alloys (MSHA) doped into polymers at different ratios on the characteristic functional groups of PLA and PHA was investigated by attenuated total reflection infrared spectroscopy (ATR-IR). The thermal properties of the prepared polymeric composites were investigated by thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). When the thermal data were analyzed, it was found that the percentage residue amount increased as the NiMnSb/NiMnCoSb ratio increased and the highest residue amount at 500 °C was found in the composite film containing 20% alloy. X-ray diffraction (XRD) showed that the characteristic signal of NiMnSb/NiMnCoSb alloy in the polymerblended composite films became more pronounced with increasing concentration at 2θ=45°. The results of the magnetization measurements showed that when a ferromagnetic material such as NiMnSb/NiMnCoSb is doped into the PLA/PHA blend film, which exhibits diamagnetic properties, the resulting composite now exhibits ferromagnetic properties. In addition, it was found that the shape-recognition effect of the PLA/PHA blend, which has a shape-recognition effect, further improves this property of the PLA/PHA blend.