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제122회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Thermal stability and mechanical properties of organoclay/EVA nanocomposites depending on host clays and organic modifiers

2018년 8월 30일 17시 00분 16초
MAT.P-476 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
10월 18일 (목요일) 11:00~12:30
Material Chemistry
저자 및
HyeonJu Ryu, Goeun Choi, Jin-ho Choy*
Department of Chemistry and Nano Science, Ewha Womans University, Korea
Nanocomposites of EVA with various organoclays have been prepared by solution blending method, depending on structure of organic modifiers, the content of organoclay and kind of host clay. However, due to the hydrophobicity of EVA polymer, it is usually necessary to modify the hydrophillic surface of clay to hydrophobic one. Therefore we modified the surface of clays such as Kunipia-F (KF), ME-100 (ME), and Laponite (Lap) to be hydrophobic by intercalating the long chain alkylammonium surfactant such as dimethyldistearylammonium bromide (DMDSA) and cetyltrimethylammonium bromide (CTA) with different structure, which were confirmed the expansion of basal spacing from the X-ray diffraction (XRD) analysis. Organoclay/EVA nanocomposites were synthesized by mixing the organoclays dispersed in toluene with EVA dissolved in toluene and evaporating the solvent. According to XRD analysis, the sharp peaks corresponding to the organoclays were diminished in organoclay/EVA nanocomposites, indicating that organoclays were predominantly exfoliated in EVA matrix. The well-dispersed state of organoclay in EVA matrix was also confirmed with the transmission electron microscopic analysis. Thermogravimetric analysis (TGA) show that CTA-clays/EVA nanocomposites have more improved thermal stability than DMDSA-clays/ EVA. In case of CTA-ME/EVA and CTA-KF/EVA, the decomposition temperature of EVA was proportionally improved by 25 °C compared to pure. The mechanical properties was also performed with the different organoclays content (1-12 wt%). The elastic modulus and tensile strength of nanocomposites gradually increase with the higher loading of clay filler, and this enhancement also can be seen indicated the larger compatibility between EVA matrix and layer silicates.