An Analysis of the Effect of Irradiance on the Weathering of Polymeric Materials

White, Kenneth M.; Fischer, Richard M.; Ketola, Warren D.

doi:10.1007/978-0-387-84876-1_5

Cited by 9 publications

(3 citation statements)

References 17 publications

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“…The more general relationship for polymer degradation takes the form of I p where Schwarzschild's p-coefficient, usually ranges from 0.5 to 1, accounts for deviations from the linear reciprocity principle. 3…”

Section: Introductionmentioning

confidence: 99%

Reciprocity and spectral effects of the degradation of poly(ethylene‐terephthalate) under accelerated weathering exposures

Gok

Gordon

Burns³

et al. 2019

J of Applied Polymer Sci

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Exposures of poly(ethylene‐terephthalate) (PET) films were performed under xenon‐arc (full spectrum) and fluorescent UVA‐340 (UV only) irradiation to investigate the reciprocity principle and wavelength dependence of photodegradation in weathering. When the intensity of full spectral irradiance is increased from 5× to 50×, the reciprocity principle is not obeyed in this material system. The change in optical properties for PET is attributed to the corresponding longer exposure time of the 5× exposure that allows oxidative reactions to occur at lower irradiance. Full spectrum xenon‐arc and fluorescent UVA‐340 lamps have different spectral distributions and samples exhibits different material degradation mechanisms under each source. The UVA‐340 exposure leads to more pronounced degradation relative to the full spectrum xenon‐arc. This study shows that intensification of a single stressor in lab‐based weathering experiments to accelerate degradation and the use of differing light sources are not sufficient to allow reliable determination of service lifetime of polymeric materials. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47589.

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Section: Introductionmentioning

confidence: 99%

Reciprocity and spectral effects of the degradation of poly(ethylene‐terephthalate) under accelerated weathering exposures

Gok

Gordon

Burns³

et al. 2019

J of Applied Polymer Sci

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“…However, cross-linking leads to improving thermal properties in contrast to the chain scission effect. It is noteworthy that when chain scission dominates, the whole molecular weight distribution (MWD) shifts toward lower molecular weights, sometimes with little change in the shape of the distribution . Cross-linking is a competing process with some polymers; however, the molecular weight averages rise if it dominates …”

Section: Results and Discussionmentioning

confidence: 99%

“…It is noteworthy that when chain scission dominates, the whole molecular weight distribution (MWD) shifts toward lower molecular weights, sometimes with little change in the shape of the distribution. 55 Cross-linking is a competing process with some polymers; however, the molecular weight averages rise if it dominates. 56 Interestingly, it was found that PVDF-HFP kept 20% of its mass loss at 800 °C, which could be accredited to the crosslinking of the polymer formed through coupling reactions of macroradicals.…”

Section: Resultsmentioning

confidence: 99%

Superior Corrosion and UV-Resistant Highly Porous Poly(vinylidene fluoride-co-hexafluoropropylene)/alumina Superhydrophobic Coating

Radwan

El-Hout

Ibrahim

et al. 2022

ACS Appl. Polym. Mater.

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The current research is devoted to fabricating a superhydrophobic coating on alumina surfaces via a facile one-step electrospinning technique. The wettability properties of the as-prepared coating were investigated. The polymeric coatings exhibited a water contact angle (WCA) of about 152° ± 3 and a sliding angle (SA) is 4 ± 2°. However, a WCA of 154 ± 2° and a SA of 3 ± 2° were recorded after the addition of Al2O3 nanoparticles. The wettability of the prepared coatings has also been inspected after exposure to intense UV irradiation of 0.89 W/(m2 nm) and high-temperature degree of 60 °C, for 500 h. It was found that the measured WCA and water contact hysteresis (WCAH) for the poly(vinylidene fluoride-co-hexafluoropropylene) PVDF-HFP/Al2O3 nanocomposite 150 ± 1° and 10 ± 1° compared with 122 ± 4° and 22 ± 4° of pure PVDF-HFP, respectively. The morphology of the superhydrophobic coating was explored, illustrating the construction of a beaded fiber structure. The surface roughness of the fabricated super water-repellent coatings was recorded using an atomic force microscope (AFM). The electrochemical behavior of superhydrophobic coating was evaluated by electrochemical impedance spectroscopy (EIS) in 3.5 wt % NaCl solution before and after exposure to UV radiation. The research outcomes promote a one-step fabrication technique to prepare polymeric superhydrophobic coatings with good resistance for corrosion and degradation under UV irradiation.

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Degradation and Fragmentation of Microplastics

Andrady

Koongolla

2022

Plastics and the Ocean

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An Analysis of the Effect of Irradiance on the Weathering of Polymeric Materials

Cited by 9 publications

References 17 publications

Reciprocity and spectral effects of the degradation of poly(ethylene‐terephthalate) under accelerated weathering exposures

Reciprocity and spectral effects of the degradation of poly(ethylene‐terephthalate) under accelerated weathering exposures

Superior Corrosion and UV-Resistant Highly Porous Poly(vinylidene fluoride-co-hexafluoropropylene)/alumina Superhydrophobic Coating

Degradation and Fragmentation of Microplastics

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