Synthesis and Characterization of the in Situ Bulk Polymerization of PMMA Containing Graphene Sheets Using Microwave Irradiation

Abstract

Polymethylmethacrylate-graphene (PMMA/RGO) nanocomposites were prepared via in situ bulk polymerization using two different preparation techniques. In the first approach, a mixture of graphite oxide (GO) and methylmethacrylate monomers (MMA) were polymerized using a bulk polymerization method with a free radical initiator. After the addition of the reducing agent hydrazine hydrate (HH), the product was reduced via microwave irradiation (MWI) to obtain R-(GO-PMMA) composites. In the second approach, a mixture of graphite sheets (RGO) and MMA monomers were polymerized using a bulk polymerization method with a free radical initiator to obtain RGO-(PMMA) composites. The composites were characterized by FTIR, 1 H-NMR and Raman spectroscopy and XRD, SEM, TEM, TGA and DSC. The results indicate that the composite obtained using the first approach, which involved MWI, had a better morphology and dispersion with enhanced thermal stability compared with the composites prepared without MWI.

Advanced multifunctional graphene aerogel – Poly (methyl methacrylate) composites: Experiments and modeling

“…Despite pure PMMA and the GA-PMMA composite exhibiting similar weight loss profiles, the TGA curve of GA-PMMA composite remarkably shifts towards a higher temperature. The onset degradation temperature (the temperature at 5% weight loss) [43] of the GA-PMMA composite increases by 16°C while the maximum degradation temperature (the temperature at 50% weight loss) [42] increases by 37°C compared to pure PMMA. This significant enhancement in thermal stability could also be attributed to the incorporation of homogeneously dispersed m-rGO sheets, which act as barriers to inhibit the mobility of PMMA chains during pyrolysis [13,42,55,72].…”

“…The GA-PMMA composites are prepared via an in situ bulk polymerization [42,43] process. Typically, 30 g of MMA and 20 mg of AIBN are first mixed and stirred at 75°C for 30 min.…”

Electrical Properties of Graphene Polymer Nanocomposites

“…For the RGO-(PMMA) nanocomposites obtained from the in situ method, the bands present at 3,420, 1,726 and 1,620 cm −1 are due to the presence of O-H, C = O and C = C groups, respectively [33]. When GO-PMMA is reduced in the case of R-(GO-PMMA), the intensity of the C = C bands increases, whereas that of the C = O band decreases.…”

Targeted drug delivery potential of hydrogel biocomposites containing partially and thermally reduced graphene oxide and natural polymers prepared via green process

“…This indicated an increase from 68.96 to 81.72°C when the rGO concentration increased from 0 to 0.007 g. The biocomposite containing WPI and rGO displayed Tg at 83.29°C. This suggests that the [36,37].…”