Department of Metallurgical and Materials Engineering
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Browsing Department of Metallurgical and Materials Engineering by Author "Gözütok, Melike"
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Item DEVELOPMENT OF NOVEL POLY(VINY ALCOHOL)/GRAPHENE NANOCOMPOSITES(2022-03-01) Gözütok, Melike; Türkoğlu Şaşmazel, HilalThe aim of this study was to develop nanocomposites by electrospinning with poly (vinyl alcohol) (PVA) and the forms of graphene, reduced graphene oxide (rGO) and Chemical Vapor Deposited (CVD)-grown monolayer graphene, in order to use them in possible applications such as packaging, electrical, thermal and tissue engineering. For this purpose, 2 major different approaches were utilized. First approach was electrospinning of PVA and rGO blend with different rGO contents (0.5 and 1 wt %), while the second approach was electrospinning of PVA solution onto a CVD grown monolayer graphene. After crosslinking of the nanocomposites, the common characterizations were done by thickness and contact angle (CA) measurements; scanning electron microscopy (SEM), mechanical property and thermogravimetric (TGA) analyses; PBS absorption and shrinkage tests, in vitro degradation and electrical conductivity measurements. Besides, chemical examinations were done via Fourier Transmission Infrared Spectroscopy (FTIR) analyses, crystallinity observations were done with X-ray Diffraction (XRD) and water vapor transmission rate (WVTR) analyses for PVA/rGO nanocomposites while optical microscopy and Raman analyses were performed for PVA electrospun CVD-grown monolayer graphene nanocomposites. The highest fiber diameter belonged to electrospun PVA+0.5 wt% rGO (~388 nm) nanocomposites whereas the lowest fiber diameter was measured for the electrospun PVA mats (~340 nm). On the other hand, the highest electrical conductivity was recorded as ~11 μS.cm-1 for electrospun PVA+1.0 wt% rGO. Additionally cell-material interactions were observed with MG-63 osteosarcoma cell-line. At the end, it was suggested that electrospun PVA+1.0 wt% rGO nanocomposites were highly suitable candidates to be used in possible applications.