Synthesis and characterization of polyethylene terephthalate-reduced graphene oxide composites

Abstract

By means of in situ melt polycondensation of polyethylenterephathalate accompanied with simultaneous reduction of introduced graphene oxide, the composite of polyethylenterephathalate filled with reduced graphene oxide was prepared. Melting and crystallization of the reduced graphene oxide – polyethyleneterephthalate composite was studied by the differential scanning calorimetry method, and the rheological test was carried out by rotational rheometry and compared to the pristine polyethylenterephathalate. The morphology of the reduced graphene oxide – polyethyleneterephthalate composite was studied using optical microscopy. The reduced graphene oxide was isolated from the reduced graphene oxide – polyethyleneterephthalate composite and characterized by thermogravimetry, X-ray photoelectron spectroscopy and X-Ray diffraction methods. Since a part of polymer could not be removed from reduced graphene oxide particles by trifluoroacetic acid, the hypothesis about probable grafting of polyethyleneterephthalate on reduced graphene oxide sheets was suggested. Rheological behaviour of the reduced graphene oxide – polyethyleneterephthalate composite melt confirms this suggestion. According to the calculations based on thermogravimetry, the reduced graphene oxide, isolated from the reduced graphene oxide – polyethyleneterephthalate composite, consists of about 80% polyethyleneterephthalate.

Achieving Highly Conductive, Stretchable, and Washable Fabric from Reactive Silver Ink and Increased Interfacial Adhesion

“…The etching mechanism involves an oxidation and hydrolysis process. , The aliphatic carbons on the ethylenic group of PET are oxidized by KMnO 4 , forming hydroxyl and carboxylate groups that increase the hydrophilicity. At the same time, the small chains of PET oligomer break down through hydrolysis reaction under a KOH environment, and thus the roughness is increased. , Fourier transform infrared (FTIR) spectroscopy only reveals new peaks after 30 min of chemical etching (Figure a).…”

“…The etching mechanism involves an oxidation and hydrolysis process. , The aliphatic carbons on the ethylenic group of PET are oxidized by KMnO 4 , forming hydroxyl and carboxylate groups that increase the hydrophilicity. At the same time, the small chains of PET oligomer break down through hydrolysis reaction under a KOH environment, and thus the roughness is increased. , Fourier transform infrared (FTIR) spectroscopy only reveals new peaks after 30 min of chemical etching (Figure a). The new peaks are −OH bending at 1387–1426 cm –1 , −OH stretching at 3161–3300 cm –1 , CO stretching at 1610–1550 cm –1 , CO stretching at 1420–1300 cm –1 , and CO bending at 1320–1211 cm –1 .…”

“…At the same time, the small chains of PET oligomer break down through hydrolysis reaction under a KOH environment, and thus the roughness is increased. 33,34 Fourier transform infrared (FTIR) spectroscopy only reveals new peaks after 30 min of chemical etching (Figure 4a). The new peaks are −OH bending at 1387−1426 cm −1 , −OH stretching at 3161−3300 cm −1 , CO stretching at 1610−1550 cm −1 , CO stretching at 1420−1300 cm −1 , and CO bending at 1320−1211 cm −1 .…”

Synthesis of Functionalized Carboxylated Graphene Oxide for the Remediation of Pb and Cr Contaminated Water

“…In addition, we achieved an identical ratio between the intensities of GO and GO-COOH representing bands, i.e., G and D bands indicating that the two molecules share a comparable structure, and the modified GO did not alter the structure of GO [ 43 ]. However, the Raman analysis confirms the successful modification of GO as the intensity of D band representing modified carboxylated GO is higher than the original GO [ 44 , 45 ].…”

Design, synthesis, and catalytic performance of modified graphene oxide based on a cobalt complex as a heterogenous catalyst for the preparation of aminonaphthoquinone derivatives

“…The TGA spectrum of graphene oxide shows that it is unstable, with weight loss even below 100 °C corresponding to the removal of absorbed water. 43 In TGA of the catalyst, the primary loss occurred at around 200 °C, which was attributed to the pyrolysis of the functional groups containing oxygen. 44 Decomposition of the catalyst after 230 °C, that continues to 800 °C indicated the thermal stability of the catalyst and related to the decomposition of functional groups in GO.…”