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Roles of Acid-Base Surface Interaction on Thermal and Mechanical Interfacial Behaviors of SiC/PMMA Nanocomposites  

Park, Soo-Jin (Advanced Materials Div., Korea Research Institute of Chemical Technology)
Oh, Jin-Seok (Advanced Materials Div., Korea Research Institute of Chemical Technology)
Publication Information
Korean Chemical Engineering Research / v.43, no.5, 2005 , pp. 632-636 More about this Journal
Abstract
In this work, the effect of chemical treatments on surface properties of SiC was investigated in thermal and mechanical interfacial behaviors of SiC/PMMA nanocomposites. The acid/base value, contact angles, and FT-IR analysis were performed for the study of surface characteristics of the SiC studied. The thermal stabilities of the SiC/PMMA nanocomposites were investigated by thermogravimetric analysis (TGA). Also the mechanical interfacial properties of the composites were studied in critical stress intensity factor ($K_{IC}$) and critical strain energy release rate ($G_{IC}$) measurements. As a result, the acidically treated SiC (A-SiC) had higher acid value than that of untreated SiC (V-SiC) or basically treated SiC (B-SiC). The acidic solution treatment led to an increase in surface free energy of the SiC, mainly due to the increase of its specific component. Thermal and mechanical interfacial properties of the SiC/PMMA nanocomposites, including initial decomposition temperature (IDT), $K_{IC}$, and $G_{IC}$ had been improved in the acidic treatment on SiC. This was due to the improvement in the interfacial bonding strength, resulting from the acid-base interfacial interactions between the fillers and polymeric matrix.
Keywords
Chemical Treatment; SiC/PMMA Nanocomposites; Thermal Stability; Mechanical Interfacial Properties;
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