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

Title
Analysis of Degradation Behaviors of Geomembrane by Accelerated Test under UV Exposure Conditions
Author(s)
박영목Belas Ahmed Khan[Belas Ahmed Khan]전한용[전한용]
Keywords
WAVELENGTH SENSITIVITY; HDPE GEOMEMBRANE; PHOTOOXIDATION; POLYPROPYLENE; POLYETHYLENE
Issue Date
201301
Publisher
POLYMER SOC KOREA
Citation
POLYMER-KOREA, v.37, no.1, pp.5 - 14
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/AIR) 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 degrees 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.
URI
http://hdl.handle.net/YU.REPOSITORY/26710http://dx.doi.org/10.7317/pk.2013.37.1.5
ISSN
0379-153X
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공과대학 > 건설시스템공학과 > Articles
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