Photo-oxidation of polymers 4. The dual mechanism of polystyrene photo-oxidation: a hydroperoxide and a photochain one

Kuzina, S. I.; Михайлов, А. И.

doi:10.1016/s0014-3057(01)00028-3

Cited by 24 publications

(14 citation statements)

References 12 publications

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“…Due to commercial interest, the photo-oxidation process of HIPS has been widely studied [18][19][20]. Transmission IR spectroscopy permits the study of the structural changes produced in HIPS following UV radiation.…”

Section: Spectroscopic Analysismentioning

confidence: 99%

Determination of the photo-degradation level of high impact polystyrene (HIPS) using pyrolysis–gas chromatography–mass spectrometry

Parrés

Sànchez-Nácher

Balart

et al. 2007

Journal of Analytical and Applied Pyrolysis

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Section: Spectroscopic Analysismentioning

confidence: 99%

Determination of the photo-degradation level of high impact polystyrene (HIPS) using pyrolysis–gas chromatography–mass spectrometry

Parrés

Sànchez-Nácher

Balart

et al. 2007

Journal of Analytical and Applied Pyrolysis

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“…The high reactivity of the peroxide propagates this reaction throughout the material. The reaction is terminated by an oxygen radical cleaving its own polymer and forming a methylene group at one end and a carbonyl group at the other end (Kuzina and Mikhailov, 2001). This increase of characteristic polymer chain end groups presents the opportunity to detect and measure plastic deterioration at a level that is undetectable from the perspective of mechanical strength or visible material integrity.…”

Section: Introductionmentioning

confidence: 99%

Characterising the deterioration of different plastics in air and seawater

Biber

Foggo

Thompson

2019

Marine Pollution Bulletin

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In situ studies of plastic deterioration can help us understand the longevity of macroplastic as well as the generation of microplastics in the environment. Photo-oxidation contributing to the generation of microplastics in the marine environment was explored using four types of plastic (polyethene, polystyrene, poly(ethylene terephthalate) and Biothene exposed in light and in shade, in both air and sea water. Metrics for deterioration were tensile extensibility and oxidation rate. Measurements were conducted at intervals between 7 and 600 days' exposure. Deterioration was faster in air than in sea water and was further accelerated in direct light compared to shade. Extensibility and oxidation were significantly inversely correlated in samples exposed in air. Samples in sea water lost extensibility at a slower rate. Polystyrene, which enters the waste stream rapidly due to its wide application in packaging, deteriorated fastest and is, therefore, likely to form microplastics more rapidly than other materials, especially when exposed to high levels of irradiation, for example when stranded on the shore.

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“…It was observed that the most demonstrated trend was the increase of the increase in the intensity of the absorption band upon irradiation of polymeric films in the range (3,750-3,200 cm -1 ). Several authors have reported that the bands in this region are attributed to the formation of hydroxyl group that results from the degradation of polymeric chromophores in presence of air and are probably due to the oxidizing benzene rings and to the decrease in the aromacity in polystyrene chromophores [13,18]. They reported three cases of benzene ring photo-oxidation: formation of benzyl acetophenone chromophores; acetophenone structures; and conjugated double bonds.…”

Section: Ft-ir Spectra For Non-irradiated and Irradiated Pure And Blementioning

confidence: 99%

Effect of UV-Irradiation on Fluorescence of Poly (Para-Ethoxystyrene) Films with Phthalate and Terephthalate Plasticizers

Ani¹,

Sieadi²,

Mouamin³

et al. 2018

JMSE-B

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The photodegradation of irradiated thin films of poly (para-ethoxystyrene) with 265 nm radiations in the presence of air and as a function of irradiation time has been studied using UV-VIS, fluorescence and FT-IR spectroscopic techniques. The increase in irradiation time caused an increase in the intensity of the absorption band of the polymer, thus indicating a possibility of photodegradation of polymeric chains. The influence of increase in irradiation times on pure poly (ethoxystyrene) films caused a decrease in the intensity of the fluorescence band and the appearance of new broad band at longer wavelength and to decrease with increase in irradiation time. The influence of added phthalate and terephthalate plasticizers on photo-oxidative degradation was also investigated, and found to increase the photodegradation processes in polymeric chains. The photo-quenching rate constant was found to increase with the increase of the molar mass and bulkiness of the used plasticizers and to increase with the increase in irradiation time. The rate constant of the photo quenching process was found to decrease with the increase in the amount of added plasticizers, indicating that the added plasticizers may act as UV-absorbers which inhibit the photodegradation process. The analysis of the FT-IR spectra of the irradiated and non-irradiated samples, showed a noticeable formation of new bands, and their intensity was found to increase with the increase in irradiation time and also with the increase in the amount of added plasticizer. In addition, the observed increase in the intensities of the carbonyl and hydroxyl absorption regions of the FT-IR spectra, provide evidence for the photodegradation as well as photo-oxidation of polymeric chains.

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Photo-oxidation of polymers 4. The dual mechanism of polystyrene photo-oxidation: a hydroperoxide and a photochain one

Cited by 24 publications

References 12 publications

Determination of the photo-degradation level of high impact polystyrene (HIPS) using pyrolysis–gas chromatography–mass spectrometry

Determination of the photo-degradation level of high impact polystyrene (HIPS) using pyrolysis–gas chromatography–mass spectrometry

Characterising the deterioration of different plastics in air and seawater

Effect of UV-Irradiation on Fluorescence of Poly (Para-Ethoxystyrene) Films with Phthalate and Terephthalate Plasticizers

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