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Thermal and Mechanical Interfacial Characteristics of Poly(Vinyl Chloride)/Red Mud Nanocomposites
전병렬,박수진,이재락,서동학 한국공업화학회 2001 한국공업화학회 연구논문 초록집 Vol.2001 No.-
In this work, the effect of surface treatment on red mud (RM) was investigated in terms of thermal, morphological, and mechanical interfacial properties of poly (vinyl chloride)/red mud (RM) nanocomposites. RM was treated in an aqueous hydrochloric acid solution. Thermal and morphological properties of the PVC/RM composites were examined in the context of differential scanning calorimerty (DSC), thermogravimetric analysis (TGA), transmission electron microscopy (TEM), and scanning electron microscopy (SEM). The interlaminar shear strength (ILSS) and critical stress intensity factor (K<sub>IC</sub>) were performed to measure the mechanical interfacial properties of PVC/RM composites. As a result, the thermal properties were improved in the acid-treated nanocomposites compared with untreated one. It was also found that chemical surface treatment on RM can improve interfacial adhesion between PVC and RM, resulting in growing the final mechanical interfacial properties. These results are due to the effect of acid-base interaction of the constituent elements in a nanocomposite system.
Thermal and Mechanical Interfacial Properties of Poly(ε-caprolactone)/Clay Nanocomposites
전병렬,박수진,이재락 한국공업화학회 2002 한국공업화학회 연구논문 초록집 Vol.2002 No.0
It is generally accepted that the dispersed inorganic particle of the nanometer scale significantly affects the properties of polymer composites, such as, thermal and mechanical properties. In this work, sodium montmorillonite (Na<sub>+</sub>-MMT) is organically modified with dodecylammonium chloride (DA-MMT) and cetyltrimethylammonium chloride (CTMA-MMT) in water to prepare the poly(ε-caprolactone)(PCL)/clay nanocomposites by melt intercalation at 80°C. X-ray diffraction (XRD) results show that the intercalation of polymer chains leads to an increase in the spacing between silicate layers of organically modified MMT (DA-MMT and CTMA-MMT). Thermal and mechanical interfacial properties of the PCL/clay nanocomposites are examined in the context of thermogravimetric analysis (TGA) and tearing energy (G<sub>IIIC</sub>) measurements. As a result, the PCL/modified MMT (DA-MMT and CTMA-MMT) nanocomposites have higher initial decomposition temperature (IDT), decomposition activation energy (E<sub><sub>t</sub></sub>), tearing energy (G<sub>ⅢC</sub>) values than those of PCL/Na<sub>+</sub>-MMT ones. These results are probably explained by increasing of the spacing of clay layers.