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http://dx.doi.org/10.7317/pk.2013.37.1.5

Analysis of Degradation Behaviors of Geomembrane by Accelerated Test under UV Exposure Conditions  

Park, Yeong Mog (Department of Civil Engineering, Yeungnam University)
Khan, Belas Ahmed (Department of Textile Engineering, Inha University Graduate School)
Jeon, Han Yong (Division of Nano-systems Engineering, Inha University)
Publication Information
Polymer(Korea) / v.37, no.1, 2013 , pp. 5-14 More about this Journal
Abstract
In this paper the effect of UV (ultraviolet) exposure on HDPE (high density polyethylene)-smooth and f-PP (flexible polypropylene) geomembranes is evaluated under UVB-313 (ultraviolet wavelength 290-315 nm) exposure. Tensile property, melt flow index (MFI), oxidation induction time (OIT), both standard-OIT and high pressure-OIT and Fourier transform infrared spectroscopy/attenuated total reflectance (FTIR/ATR) results are discussed. Although tensile properties of the exposed geomembrane samples remained unchanged, the depletion of antioxidants was found higher for f-PP than for HDPE geomembrane. Arrhenius model by extrapolation was used on the data to predict the antioxidant lifetime to a typical site temperature of $20^{\circ}C$. There was no significant difference between the MFI value of the virgin and UV exposed HDPE geomembrane samples but a decrease in MFI was found in f-PP geomembrane that signifies that crosslinking has occurred. From FTIR spectra, the small peak (near $1750\;cm^{-1}$) observed in the spectrum of UV exposed sample corresponds to a carbonyl (C=O) linkage, which suggests that oxidation has occurred in the polymer structure, and another new band for f-PP between 3100 and $3500\;cm^{-1}$ is attributed to a hydroxyl bond and/or hydroperoxide bond.
Keywords
UV degradation; geomembrane; melt flow index; oxidative induction time; Arrhenius model by extrapolation;
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