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Pollymers 2020,, 12,, x FOR PEER REVIEW 10 off 16 indicates the strong enhancement in thermal stability compared to neat PS-PMMA.. In addition,, the Polymers 2020, 12, 1155 10 of 16 R-(GO-(PS-PMMA))/AgNPs nanocomposite clearly showed more thermal improvement than RGO/AgNPs-(PS-PMMA),, as it can be noted that about 70 wt.. % of the R-(GO-(PS-PMMA))/AgNPs RGO/AgNPs-(PS-PMMA), as it can be noted that about 70 wt. % of the R-(GO-(PS-PMMA))/AgNPs nanocomposite was remaining at 600 °C,, while the RGO/AgNPs-(PS-PMMA) nanocomposite nanocomposite was remaining at 600 ◦ C, while the RGO/AgNPs-(PS-PMMA) nanocomposite completely completely degraded.. The two-step thermal degradation of the nanocomposite can be correlated with degraded. The two-step thermal degradation of the nanocomposite can be correlated with the presence the presence of AgNPs,, which promoted thermal degradation of the nanocomposite in the early of AgNPs, which promoted thermal degradation of the nanocomposite in the early stages (196 ◦C) and stages (196 °C) and caused thermal stability at higher temperatures (400 °C) [49].. This is in agreement caused thermal stability at higher temperatures (400 ◦C) [49]. This is in agreement with the SEM and with the SEM and TEM results reported above.. As can be seen in the DSC thermogram (Figure 8),, the TEM results reported above. As can be seen in the DSC thermogram (Figure 8), the glass transition glass transition temperatures (Tg) of RGO/AgNPs-(PS-PMMA) nanocomposites decreased by 5..5 °C temperatures (Tg) of RGO/AgNPs-(PS-PMMA) nanocomposites decreased by 5.5 ◦C with respect to with respect to neat PS-PMMA (i..e..,, from 93..5 to 88 °C).. The Tg of the R-(GO (PSPMMA))/AgNPs neat PS-PMMA (i.e., from 93.5 to 88 ◦C). The Tg of the R-(GO (PSPMMA))/AgNPs nanocomposite, nanocomposite,, on the other hand,, significantly improved,, and a Tg of 182 °C was recorded,, which on the other hand, significantly improved, and a Tg of 182 ◦C was recorded, which is 88.5 ◦C higher is 88..5 °C higher than that of the neat PS-PMMA.. This suggests and further complements the strong than that of the neat PS-PMMA. This suggests and further complements the strong interaction between interaction between PS-PMMA chains and RGO/AgNPs reported through MWI.. Therefore,, the use PS-PMMA chains and RGO/AgNPs reported through MWI. Therefore, the use of MWI is advantageous of MWI is advantageous for the development of new classes of RGO/MNPs polymer-based for the development of new classes of RGO/MNPs polymer-based nanocomposites. nanocomposites.. Figure7..TGAthermogramsforRGO/AgNPs/PS-PMMAnanocomposiites.. Figure 8. DSC thermograms for (a) neat PS-PMMA, (b) RGO/AgNPs-(PS-PMMA), and (c) Figure 8.. DSC thermograms for (a) neat PS-PMMA,, (b) RGO/AgNPs-(PS-PMMA),, and (c) R-(GO-(PS- R-(GO-(PS-PMMA))-AgNPs. PMMA))-AgNPs..PDF Image | Microwave Irradiation Synthesis Silver Nanoparticle
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