Assessing the photo-degradation of geosynthetics by outdoor exposure and laboratory weatherometer

Suits, L David; Hsuan, Y. G.

doi:10.1016/s0266-1144(02)00068-7

Cited by 70 publications

(42 citation statements)

References 11 publications

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“…Once in the environment, plastic waste is subjected to solar radiation, UV rays and heat, which affect their surface as well as to some extent their bulk properties. This deterioration or degradation process, however, is extremely slow 6 . The primary step for instigating this biodegradation process would be attaching a microorganism to the polymer surface, thus creating a biofilm 7 .…”

Section: Introductionmentioning

confidence: 99%

Degradation study of polypropylene (PP) and bioriented polypropylene (BOPP) in the environment

et al. 2011

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Polymers are vastly employed for numerous purposes in different industrial segments and generate soaring quantities of discarding in the environment. This research analyzed the degradability/biodegradability of polypropylene films (PP) and Bioriented polypropylene (BOPP) polymers after 11 months interred in the São Giácomo landfill in Caxias do Sul. Comparing the buried PP film to a sample of virgin PP, two peaks of degrading activity appeared at the TG curve as well as structure modification typified by occurrence of new absorption bands at FTIR, which can be credited to changes in crystallinity. Thermal analysis carried out on the buried PP and BOPP showed decreases in the percentage of crystallinity due to chain scission. The major reduction was observed in the PP, since its crystallinity is a consequence of polymerization instead of chain orientation processes, as in BOPP. Cracks and erosion of the polymer surface were detected in both PP and BOPP, indicating degrading processes by microorganisms.

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Section: Introductionmentioning

confidence: 99%

Degradation study of polypropylene (PP) and bioriented polypropylene (BOPP) in the environment

et al. 2011

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“…These free radicals quickly react with oxygen leading to unstable intermediates called hydroperoxides that can in turn cause oxidative degradation of polymers. 1,5,6 Antioxidants, stabilizers and carbon black present in the GM formulation can all scavenge or neutralize free radicals thus delaying onset of the oxidation degradation. While carbon black is a permanent filler residing in the polymer, antioxidants and stabilizers can be depleted by leaching or consumption and thus they have a limited lifetime.…”

Section: 폴리머 제37권 제1호 2013년mentioning

confidence: 99%

“…When solar radiation strikes the exposed polymer surface, photons with energy similar, or higher than the chemical bond strength of the polymer cause a series of reactions that can lead to polymer chain scission and eventual degradation of polymer properties. 5 For instance, the chemical bond strengths of C-C and C-H bonds are 420 and 340 kJ/mol, respectively. On the other hand, the energies of 300 and 400 nm photons (in the UV range) are 390 and 300 kJ/mol, respectively.…”

mentioning

confidence: 99%

“…On the other hand, the energies of 300 and 400 nm photons (in the UV range) are 390 and 300 kJ/mol, respectively. 5 Thus, the UV radiation has adequate energy to break chemical bonds of polymers, with the shorter wavelengths being more severe. The most effective spectral region of irradiation to cause the photo-oxidation of PE (polyethylene) and PP (polypropylene) is in the range 330-360 nm and 335-360 nm respectively which fall within the UV region (<400 nm).…”

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confidence: 99%

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

Park¹,

Khan²,

Jeon³

2013

Polymer Korea

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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 o 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.

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“…A energia requerida para gerar radicais livres nas poliolefinas é menor do que aquela requerida para romper as ligações C-H, dessa forma, as poliolefinas são mais suscetíveis à degradação UV do que outros tipos de polímeros (Suits;Hsuan, 2003).…”

Section: Segundo Andrady Et Al (1998) Como Resultados Dos Mecanismounclassified

Procedimentos para avaliação da degradação de reservatórios de polietileno para água potável expostos às intempéries.

Ribeiro¹,

Agopyan²

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Assessing the photo-degradation of geosynthetics by outdoor exposure and laboratory weatherometer

Cited by 70 publications

References 11 publications

Degradation study of polypropylene (PP) and bioriented polypropylene (BOPP) in the environment

Degradation study of polypropylene (PP) and bioriented polypropylene (BOPP) in the environment

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

Procedimentos para avaliação da degradação de reservatórios de polietileno para água potável expostos às intempéries.

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