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Mechanical and Oxygen Permeation Properties of Layered Double Hydroxide/Ethylene Vinyl Acetate Nanocomposite Membranes  

Hwang, Ji-Young (Department of Industrial Chemistry, Sangmyung University)
Lee, Sang-Hyup (Water Environment Center, Korea Institute of Science and Technology)
Lee, Jong-Suk (Water Environment Center, Korea Institute of Science and Technology)
Hong, Se-Ryung (College of general studies, Sangmyung University)
Lee, Hyun-Kyung (Department of Industrial Chemistry, Sangmyung University)
Publication Information
Membrane Journal / v.23, no.2, 2013 , pp. 151-158 More about this Journal
Abstract
The effect of layered double hydroxides (LDH) on the gas separation properties of ethylene vinyl acetate copolymer was investigated. Mg-Al LDH/EVA nanocomposite membranes were prepared from solution intercalation using organically modified LDH (DS-LDH). Dodecyl sulfate (DS)-LDH was obtained by the intercalation of DS anion in the interlayer. The nanocomposite structure has been elucidated by X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy and scanning electron microscopy (SEM). XRD pattern clearly shows that the DS-LDH layers are disorderly well dispersed in the EVA matrix. The maximum tensile strength and elongation of the LDH/EVA nanocomposite membrane were found with the LDH content 3 wt%. The thermal properties of nanocompostie membrane were enhanced by the incorporation of LDH in EVA matrix. Gas permeation of LDH/EVA nanocomposite membranes with LDH contents of 1, 3, 5 wt% was studied for $O_2$ and $CO_2$ single gases. The presence of 3 wt% LDH decreased $O_2$ permeability by up to 53% compared to the EVA membrane. In spite of barrier property of nanocomposite membrane, however, the gas permeability for $CO_2$ was increased due to its strong affinity with the residual OH groups on the LDH.
Keywords
EVA copolymer; LDH; Nanocomposite membranes; Permeability; Selectivity;
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