화학공학소재연구정보센터
Chemical Engineering Journal, Vol.225, 202-209, 2013
Oil-sorbent to hydrosorbent switching in Poly-9-octadecenylacrylate and Poly-9-octadecenylacrylate/Au nanocomposites
In this paper we have synthesized Poly-9-octadecenylacrylate (PODA) and Poly-9-octadecenylacrylate/Au (PODA/Au) nanocomposites and characterized the polymer by Fourier Transformed Infrared spectrometer, Scanning Electron Microscopy, Thermogravimetric Analysis and X-ray Diffraction study. It is observed that the swelling properties of PODA and that of PODA/Au nanocomposites are completely different. PODA is found to have high swelling ratio with most of organic solvents like chloroform, tetrahydrofuran, benzene, toluene, pyridine and oils like kerosene and gasoline. PODA/Au nanocomposites, on the other hand, are sorbent to water, salt solutions and alcohol/water mixtures. Alternating current impedance measurements show that there is a sharp decrease in impedance values on addition of Au nanoparticles to PODA. The AC conductivity values at 35 degrees C for PODA is found to be 7.60 x 10(-9) S cm(-1), while that of [PODA/Au] in the ratios 1:0.0117 M, 1:0.0233 M and 1:0.0397 M increases to 9.86 x 10(-7), 1.14 x 10(-5) and 1.19 x 10(-4) S cm(-1) respectively. Ionic transport number measurement shows that while PODA does not have any ionic contribution, PODA/Au nanocomposites have up to 40% ionic conduction. A possible mechanism to explain this switching from oil-sorbent to hydrosorbent in PODA and PODA/Au nanocomposites is also discussed. (c) 2013 Elsevier B.V. All rights reserved.