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  • 09월 12일 17시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능

제110회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Nanocomposites of layered double hydroxides and EVA polymer with the enhanced thermal stability

2012년 9월 5일 16시 01분 44초
MAT.P-1368 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
10월 17일 (수요일) 16:00~19:00
저자 및
zhang wei, 양재훈, 최진호
이화여자대학교 화학.나노과학과, Korea
Layered double hydroxides (LDHs) are a new class of promising materials as a potential additive which improve the physicochemical properties of the polymer. In this work, we prepared nanocomposites of ethylene-vinyl acetate copolymer (EVA) with LDHs via solution blending method. However, intact LDHs are not compatible with the hydrophobic polymer matrix due to their hydrophilic property. At first, we synthesized various kinds of organo-LDHs through the conventional co-precipitation method by changing the divalent metal ions in LDHs (Mg ,Zn ,Ca), the kinds of organic surfactants such as dodecyl sulfate (DS) and dodecylbenzene sulfonate (DBS), and the metal ratios of divalent metal to trivalent one. According to the x-ray diffraction analysis, the basal spacing of LDHs was expanded to 2.4 - 2.9 nm for the DS and DBS intercalated LDH compared to that of nitrate form LDH (0.86 nm), indicating that DBS or DS molecules were successfully intercalated into LDH to form interdigitated bilayer structure with perpendicular orientation to the basal plane of LDH. From the FT-IR spectra, we found that the anionic surfactants are present in the interlayers of the LDHs due to the electrostatic interaction based on the characteristic bands of -SO3- along with aromatic and alphatic C-H and C-C stretching vibrations. The nanocomposites of EVA with varying amounts of organo-LDHs were prepared by solution blending method. According to the XRD analysis, LDHs were exfoliated and partially exfoliated/intercalated in the EVA matrix depending on the LDH loading content. Thermogravimetric analysis shows that thermal stability of the nanocomposites is improved compared to the pristine EVA.