Influence of light intensity on the photodegradation of bisphenol A polycarbonate

Diepens, M Marjolein; Gijsman, Pieter

doi:10.1016/j.polymdegradstab.2008.10.003

Cited by 46 publications

(27 citation statements)

References 22 publications

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“…UV absorption spectra were recorded for the accelerated and outdoor degraded BPA-PC films. The UV absorption spectra for the accelerated experiments show increased absorption with irradiation times [14]. The outdoor weathered samples show similar behavior; with increasing irradiation time, the absorption below 400 nm is increasing.…”

Section: Comparison Of Accelerated and Outdoor Exposure Testsmentioning

confidence: 71%

“…In our previous work, a linear relation was found between the scaling factors, derived from UV and IR absorption, and changes in irradiation intensity [14]. Therefore it was expected that at the same dosage in the accelerated and in the outdoor weathering test a comparable amount of degradation would be found.…”

Section: Comparison Of Accelerated and Outdoor Exposure Testsmentioning

confidence: 85%

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Outdoor and accelerated weathering studies of bisphenol A polycarbonate

Diepens

Gijsman

2011

Polymer Degradation and Stability

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a b s t r a c tThe influence of outdoor weathering on the degradation rate of unstabilized bisphenol A polycarbonate (BPA-PC) films is investigated and compared to the results found for indoor accelerated weathering conditions, using UV and IR spectroscopy. At the same dosage, changes in UV and IR were larger for the accelerated than for the outdoor weathered samples, this could be explained by the lower degradation temperature during outdoor exposures. The difference between outdoor and accelerated weathering is according to the IR measurement larger than according to the UV measurement. This difference is ascribed to difference in wavelength distribution between the spectra of the light emitted in the accelerated test and from the terrestrial sunlight. The larger difference for the IR results than for the UV results suggests a difference in ratio between photo-Fries rearrangements and photo-oxidation reaction between both exposures.

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Section: Comparison Of Accelerated and Outdoor Exposure Testsmentioning

confidence: 71%

Section: Comparison Of Accelerated and Outdoor Exposure Testsmentioning

confidence: 85%

Outdoor and accelerated weathering studies of bisphenol A polycarbonate

Diepens

Gijsman

2011

Polymer Degradation and Stability

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“…Comparatively, CZ was degraded slower under UV-254 than UV-225-425, but the removal rate of CZ was also up to 98.41% at 60 min, and it followed the pseudo-first-order kinetic equation well (R 2 = 0.9985, p < 0.0001) [30]. The large difference in degradation rate of CZ under UV-225-425 and UV-254 was mainly caused by the power imparity of light source [31,32]. A nearest literature reported that the half-life (t 1/2 ) of CZ under UV-254 was 3.95 min [23], slightly lower than present study (9.78 min), which might cause by the different photodegradation conditions, such as light source (), photo-reactor, initial concentration etc.…”

Section: Uv Photodegradation Compared To Chlorinationmentioning

confidence: 88%

“…However, an early report pointed out that the photodegradation of CZ (15.8 mg/L) under UV-A and UV-B appeared to be pH-dependent (pH = 5.0, 7.0 and 9.0) with the k values range of 0.0099-0.0165 min −1 [22]. Similarily, this contrast may also explain by the difference of photodegradation conditions [19,31,33].…”

Section: Effect Of Ph On the Photodegradation Of Czmentioning

confidence: 96%

“…A nearest literature reported that the half-life (t 1/2 ) of CZ under UV-254 was 3.95 min [23], slightly lower than present study (9.78 min), which might cause by the different photodegradation conditions, such as light source (), photo-reactor, initial concentration etc. [19,31,33]. When compared to photodegradation, the chlorine oxidation of CZ was very poor (Fig.…”

Section: Uv Photodegradation Compared To Chlorinationmentioning

confidence: 99%

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Photodegradation of the azole fungicide climbazole by ultraviolet irradiation under different conditions: Kinetics, mechanism and toxicity evaluation

Liu

Ying

Zhao

et al. 2016

Journal of Hazardous Materials

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h i g h l i g h t s• Climbazole (CZ) could be effectively degraded under UV-254 irradiation.• CZ underwent direct and selfsensitized photolysis involving ROS.• The main photodegradation byproducts of CZ were identified and semi-quantitated.• Pathway includes hydroxylative dechlorination, dechlorination, and de-pinacolone.• The toxicity of the photodegradation system reduced after UV-254 irradiation. Keywords: Climbazole Photodegradation Reactive oxygen species By-products Toxicity a b s t r a c t Climbazole (CZ) has been known to persist in various environmental media, and may cause potential risks to aquatic organisms. This study investigated the photodegradation of CZ by ultraviolet (UV, 254 nm) under different conditions. The results revealed that CZ could be effectively degraded in aqueous solutions under UV-254 irradiation with a half-life of 9.78 min (pH = 7.5), and the photodegradation followed pseudo-first-order kinetics. pH had almost no effect on its rate constants and quantum yields; but the water quality of natural waters could affect the photolysis of CZ, and the coexisting constituents such as Fe 3+ , NO 3 − , and HA obviously inhibited its photolysis. The addition of different radical scavengers also inhibited the photodegradation of CZ due to the reduction of reactive oxygen species (ROS). CZ underwent direct and self-sensitized photolysis involving ROS. Based on the identified photodegradation by-products, the proposed pathways included hydroxylative dechlorination, dechlorination and de-pinacolone. Moreover, toxicity evaluation using duckweed found significant toxicity reduction in the photodegradation system of CZ after the irradiation of UV-254, and the remaining by-products did not pose extra toxicity compared with CZ itself. These findings from present study suggest that CZ in effluent could be further reduced by applying UV photolysis treatment.

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Comparative investigation of the ultraviolet stabilization of polycarbonate/poly(acrylonitrile–butadiene–styrene) with different ultraviolet absorbers

Rajan

Wäber²,

Wieser³

2011

J of Applied Polymer Sci

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When polycarbonate (PC)/poly(acrylonitrile-butadiene-styrene) (ABS) blends are exposed to outdoor conditions, they are mainly degraded by sunlight; this is known as photodegradation. It is the ultraviolet radiation in the sunlight that is responsible for the degradation of the blend. To stabilize the blend against the harmful ultraviolet radiation, ultraviolet absorbers (UVAs) are used. In this study, three different UVAs-Tinuvin 1577 (a hydroxyphenyl triazine type), Cyasorb 5411 (a benzotriazole type), and Uvinul 3030 (a cyanoacrylate type)-were compounded with a PC/ABS blend at 240 C with a twin-screw extruder. Accelerated aging of the compounded sample was done by an Atlas Suntest containing xenon lamp. The degradation studies were performed with ultraviolet-visible spectroscopy, attenuated total reflectance/Fourier transform infrared spectroscopy, and yellowing index measurements. The molecular weight of the compounded sample was determined by gel permeation chromatography. It was found that hydroxyphenyl triazine type UVA showed the best results for decreasing the degradation products, oxidation rate, and yellowing of the PC/ABS blend.

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Influence of light intensity on the photodegradation of bisphenol A polycarbonate

Cited by 46 publications

References 22 publications

Outdoor and accelerated weathering studies of bisphenol A polycarbonate

Outdoor and accelerated weathering studies of bisphenol A polycarbonate

Photodegradation of the azole fungicide climbazole by ultraviolet irradiation under different conditions: Kinetics, mechanism and toxicity evaluation

Comparative investigation of the ultraviolet stabilization of polycarbonate/poly(acrylonitrile–butadiene–styrene) with different ultraviolet absorbers

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