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Polymers 2020, 12, x FOR PEER REVIEW 9 of 16 Polymers 2020, 12, 1155 9 of 16 prepared R-(GO-(PS-PMMA))/AgNPs (Figure 6d,f) clearly showed that RGO/AgNPs nanosheets were well-dispersed within the PS-PMMA matrix. Therefore, the results of XRD, SEM, and HRTEM matrix. Therefore, the results of XRD, SEM, and HRTEM can verify the formation and complete can verify the formation and complete dispersion of AgNPs within the RGO/PS-PMMA matrix. The dispersion of AgNPs within the RGO/PS-PMMA matrix. The uniform dispersion of AgNPs within the uniform dispersion of AgNPs within the exfoliated RGO and PS-PMMA matrix was enhanced and exfoliated RGO and PS-PMMA matrix was enhanced and improved by MWI, which should increase improved by MWI, which should increase the thermal properties of the nanocomposites. The higher the thermal properties of the nanocomposites. The higher dispersion and lower aggregation resulted dispersion and lower aggregation resulted from van der Waals attraction among the particles, from van der Waals attraction among the particles, evidencing stabilization of RGO-AgNPs, which evidencing stabilization of RGO-AgNPs, which can be correlated with the electron transfer can be correlated with the electron transfer interaction between the polymers and RGO-AgNPs, in interaction between the polymers and RGO-AgNPs, in agreement with the XPS results and our agreement with the XPS results and our previous work [19]. The particle size obtained from TEM previous work [19]. The particle size obtained from TEM results is in good agreement with the XRD results is in good agreement with the XRD results, which also showed a nanometer dimension. results, which also showed a nanometer dimension. Figure 6. HR-TEM images of (a) AgNPs, (b) RGO/AgNPs, (c,e) RGO/AgNPs-(PS-PMMA), and (d,f) Figure 6. HR-TEM images of (a) AgNPs, (b) RGO/AgNPs, (c,e) RGO/AgNPs-(PS-PMMA), and (d,f) R-(GO-(PS-PMMA)-AgNPs. R-(GO-(PS-PMMA)-AgNPs. 3.73..T7.hTerhmeramlaPlrPorpoepretrietsieosfotfhteheNNananooccoomppoossiitteess ThTehtehethrmermalaplrporpoepretrietisesooffththeepprreeparrednanocomposiitesweerreeininvveestsitgigataetdedusuinsignTgGTAGA(Fi(gFuigreu7re) 7) andanDdSDCSC(Fi(gFuigruere8)8.).TThheeddaatataffrromtthese analyses((ii..ee.,.,TTGAAaannddDDSCSC) a)raeresusmumamriazreidzeidn iTnabTlaeb1le. 1. From Figure 7 and Table 1, it can be noted that the degradation temperature of RGO/AgNPs started From Figure 7 and Table 1, it can be noted that the degradation temperature of RGO/AgNPs started ◦◦ at over 158 °C, while for neat PS-PMMA, it began at 367 °C. However, when incorporating the at over 158 C, while for neat PS-PMMA, it began at 367 C. However, when incorporating the nanosheets into the polymer matrix, the degradation temperatures of the polymer nanocomposites nanosheets into the polymer matrix, the degradation temperatures of the polymer nanocomposites were enhanced to 400 °◦C for both RGO/AgNPs-(PS-PMMA) and R-(GO (PSPMMA))/AgNPs. This were enhanced to 400 C for both RGO/AgNPs-(PS-PMMA) and R-(GO (PSPMMA))/AgNPs. This indicates the strong enhancement in thermal stability compared to neat PS-PMMA. In addition, the R-(GO-(PS-PMMA))/AgNPs nanocomposite clearly showed more thermal improvement thanPDF Image | Microwave Irradiation Synthesis Silver Nanoparticle
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