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Polymers 2020, 12, 1155 11 of 16 Table 1. Summary of the thermal properties based on TGA and DSC measurements. Sample RGO/Ag NPS PS-PMMA RGO/Ag NPs-(PS-PMMA) R-(GO-PS-PMMA)-Ag NPs T (◦C) deg 158 288, 367 400 196, 400 Td (10% Weight Loss) (◦ C) - 344 340 228 Tmax (50% Weight Loss) (◦ C) - 397 397 <800 T (◦C) g - 93.5 88 181 3.8. Mechanical Properties of the Nanocomposites The hardness (H) and elastic modulus (Es) of the nanocomposites were determined from the P–h profiles that are shown in Figure 9 at 100 μN loads. It can be observed that the reduced graphene oxide (RGO) nano-fillers, the AgNPs-PMMA matrix, and the AgNPs-PSTY significantly improved the mechanical properties. The nanocomposite R-(GO-PMMA)/AgNPs and R (GO-PSTY)/SectionAgNPs obtained using the MWI method, however, exhibited significant degradation in the mechanical properties. The higher dispersibility and interfacial interactions between the GO nano-filler and the AgNPs-PMMA matrix were correlated with the mechanical improvements, as indicated by the dense microstructural features. These enhancements in the mechanical characteristics could be attributed to the stiffness of the nanocomposite, which arises from the number of entanglements and strong bonds within the network. Extra physical entanglements that are introduced through the cross-linking increases the overall stiffness. In the case of the R-(GO-PMMA) nanocomposite, the hardness and elastic modulus values are very similar to those of PMMA, which can be attributed to the similar Tg value and the effect of incoherent microstructural features. Based on the microstructural discussion above, the uniform distribution of AgNPs in the MWI method was expected to provide mechanical support during nanoindentation testing. However, in the case of R-(GO-PMMA)/AgNPs, the hardness and elastic modulus values were significantly low, which can be attributed to the lamella microstructure.PDF Image | Microwave Irradiation Synthesis Silver Nanoparticle
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