A Study on the Thermal and Mechanical Properties of PMMA Composite Materials by Compounding with Natural and Expanded Graphites
聚甲基丙烯酸甲酯 ； 膨脹石墨 ； 熱傳導性質 ； Poly(Methyl Methacrylate) ； Expanded Graphite ； Thermal Conductivity
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In this study, the submicron natural graphite (NG) and expanded graphite (EG) powders were added during the process of PMMA (Poly(Methyl Methacrylate)) in-situ polymerization to fabricate composites. In this experiment, the natural graphite powder was mixed and saturated with acids consisting of concentrated sulfuric acid, hydrogen peroxide and nitric acid to form the graphite intercalated compound (GIC). The mixed acid was an intercalant. The mixture was carefully washed and filtrated with deionized water until the pH level of the solution reached 6. After being dried at 60 ℃in a vacuum oven for 12 h, the GIC was rapidly expanded at 750 ℃ in a muffle furnace to form expanded graphite (EG). Then, it was in the course of synthesizing methyl methacrylate to form PMMA, the submicron natural graphite (NG) and expanded graphite (EG) powders with different particle sizes (3μm and 40μm) and amounts were added. To understand the composite properties, PMMA/ graphite composites were investigated by ATR-FTIR, which shows neither new groups were made nor phenomenon of displacement. The basic thermal properties of PMMA and graphite composites were investigated by thermogravimetric analyzer (TGA) and the thermal conductivity were evaluated by quick thermal conductivity meter. To consider the endurance of composites, the mechanical properties were also investigated. The dispersibility of filler in PMMA and graphite composites was obtained by studying the scanning electron microscopy (SEM).
工程學 > 化學工業