Abstract
In this research paper, the effect of microwave (MV) irradiations on shape memory and mechanical properties of SMP/GNPs composites were prepared through ex-situ polymerization. Shape memory thermoplastic polyurethane (PU) composites containing different amount of graphene nanoplatelets (GNPs) ranging from 0 to 2 phr were prepared in micro-compounder by melt mixing route. FE-SEM, stress-strain, recovery stress, DMA, DSC, shape memory test was studied. With the addition of GNPs the recovery stress, tensile stress, yield stress, constrain strain recovery, storage modulus, thermal diffusivity, shape recovery were improved. Recovery strength, constrain strain recovery and tensile strength for 2 GPU (GPU= concentration of GNPs in PU matrix) increased by 150%, 50%, 20% as compared to PU respectively. graphene nanoplatelet is a strong absorption of microwave irradiation so that SMP/GNPs composites containing 1 GPU, 1.5 GPU, and 2 GPU were successfully triggered by MV irradiation. Further shape recovery also depends on the MV frequency and concentration of GNPs. The pure specimen has no shape recovery effect in MV irradiations. So that MV-induced SMP/GNPs composites have provided the potential better choice for fast actuating remote sensing and wireless applications.
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