Please use this identifier to cite or link to this item: http://hdl.handle.net/10266/6725
Title: Synthesis of Graphene Oxide from Different Precursors and its Fiber-Reinforced Nanocomposites
Authors: Garg, Anushka
Supervisor: Basu, Soumen
Mehta, Rajeev
Mahajan, Roop L.
Keywords: One-pot method;Mechanical performance;Coal;Graphene oxide;E-Glass based epoxy composites
Issue Date: 13-May-2024
Abstract: Thesis is divided in 4 chapters. Chapter-1 describes the background of nanomaterials, carbon-based nanomaterials including graphene and its derivatives along with literature survey and scope of the work. This Chapter discusses detailed information about different synthesis methods for graphene from different precursors, i.e., coal and graphite and related advancements along with the limitations, utilization of these types of nanofiller in polymer composites for improved mechanical performance. A thorough literature survey has been done to understand the reinforcement of different nanofillers in the E-Glass based epoxy composites. Chapter-2 presents new data on the feasibility of using a facile one-pot process with HNO3 to synthesize graphene oxide (GO) from bituminous coal (BC) as well as anthracite coal procured from coalfields in India. The synthesized graphene oxide from bituminous coal (BC-GO) and semi-anthracite coal (AC-GO) was characterized using various techniques including SEM-EDX, FTIR, XRD, XPS, BET-BJH, LRS, TEM, SAED, AFM, and DLS. These results were then compared with those for GO derived from graphite and purified AC using modified Hummers’ method. The characterization data revealed both similarities and significant differences in the properties of these materials. Furthermore, the study explores the potential application of coal-derived GO by studying the mechanical properties of glass fiber-reinforced polymer nanocomposites with AC-GO as a nanofiller. The results demonstrate that coal-derived GO effectively enhances the mechanical properties of the nanocomposites. In Chapter-3, we have compared the effect of various precursor-based graphene oxide (GO) nanofillers on enhancing the mechanical performance of E-glass fiber reinforced epoxy resin composites (EGFPs). GO derived from bituminous coal (BC-GO) and graphite (Gr-GO) were dispersed into epoxy resin matrix. The resulting mixture was combined with E-glass fiber mats using vacuum-assisted resin infusion molding. Notable improvements (38.9 % in flexural strength, 22.9 % in tensile strength, and 21.6 % in impact strength) were observed in BC-GO reinforced EGFPs at 0.25 phr loading of BC-GO. The improvements for Gr-GO reinforced EGFPs were 28 %, 9.3 %, and 6.8 %, respectively. These findings underscore the potential of BC-GO as a cost-effective reinforcement for polymer nanocomposites across various industrial applications, including the development of lightweight and strong materials for aerospace and automotive industries, protective coatings, petroleum, and aerospace production systems. In Chapter-4 a comparative study depicting the synergistic performance of two different nanofillers, namely halloysite nanotubes (HNT) clay and multiwalled carbon nanotubes (MWCNT), in conjunction with a fixed concentration (0.125 phr) of semi-anthracite coal-derived graphene oxide (AC-GO) on enhancing the mechanical properties of E-glass fiber reinforced epoxy resin composites (EGFPs) is shown. The dispersion of AC-GO with HNT clay (GO-H) and AC-GO with MWCNT (GO-C) within the epoxy resin matrix was achieved using sonication and homogenization techniques. The resulting mixture was incorporated into E-glass fiber mats employing the “vacuum-assisted resin infusion molding” (VARIM) technique. Notable improvements (18.3% in flexural strength, 14.6% in tensile strength, and a slight increase in impact strength (1.8%)) were observed in EGFPs reinforced with GO-H at a 0.50 phr loading of HNT, with an AC-GO concentration maintained at 0.125 phr. Correspondingly, optimal values for GO-C reinforced EGFPs at 0.25 phr were 40.3%, 18.7%, and a 10.5% decrease in impact strength, respectively. Importantly, considering that the cost of HNT clay is approximately 15 times cheaper than industrial-grade MWCNTs, these findings underscore the potential of GO-H as a very cost-effective reinforcement alternative to GO-C for polymer nanocomposites for various industrial applications.
URI: http://hdl.handle.net/10266/6725
Appears in Collections:Doctoral Theses@SCBC

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