Degradation of polymer blends—IV. Natural weathering of blends of low density with linear low density polyethylene

Daro, Arlette; Trojan, Michèle; Jacobs, Robert; David, Christiane

doi:10.1016/0014-3057(90)90096-m

Cited by 18 publications

(5 citation statements)

References 9 publications

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“…The results are indicative of the harmful effect of UV‐B radiation on the expected lifetime of the films. The accelerated UV degradation study results, however, cannot be correlated directly to those of natural exposure, as the incident solar energy varies according to the season, presence and absence of clouds, rains, and turbidity of the atmosphere 20, 21. The lamps used during the course of this study emit radiation much below the normal sunlight cut‐on and thereby cause degradation by mechanisms that don't normally occur when materials are exposed to sunlight.…”

Section: Resultsmentioning

confidence: 98%

Study on the degradation of low‐density polyethylene in the presence of cobalt stearate and benzil

Roy

Parthasarathy

Rajagopal

et al. 2005

J of Applied Polymer Sci

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Degradable polymers are in great demand for a variety of applications such as packaging, agriculture, and medicine. Polyolefins blended with photodegradants/ biodegradants are potential candidates for replacing the nondegradable thermoplastics in areas where litter abatement poses problems. In the present article, the effect of metallic photoinitiators like cobalt stearate and a combination of metallic/nonmetallic photoinitiators, i.e., a mixture of cobalt stearate and benzil, on the photooxidative degradation of low-density polyethylene (LDPE) films have been investigated. Attempts have been made to correlate the results as a function of mixed additives. Films of LDPE containing varying amounts of cobalt stearate and a combination of benzil and cobalt stearate were prepared. The photodegradation of these films has been monitored by various techniques like FTIR spectroscopy, differential thermal analysis, and density and viscosity measurements. Cobalt stearate was highly effective in accelerating the photodegradation of LDPE films at low concentrations. The addition of benzil to cobalt stearate decreased the rate of photodegradation compared to cobalt stearate alone. A retarding effect was observed when benzil alone was added to LDPE.

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Section: Resultsmentioning

confidence: 98%

Study on the degradation of low‐density polyethylene in the presence of cobalt stearate and benzil

Roy

Parthasarathy

Rajagopal

et al. 2005

J of Applied Polymer Sci

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“…The linear relationship between YI (which is an indication of degradation degree) and the UV dosage is in agreement with the findings of Daro, who examined the chain scissions per molecule for the polyolefin and found that the number of chain scissions exhibited an linear relationship to the accumulated total solar radiant exposure. 73 Table 5 clearly shows that sample C has the highest degradation rates (at least 8 times higher than the other three samples) and sample K is the most UV resistant sample. Fig.…”

Section: A B C Dmentioning

confidence: 96%

Ultra-violet degradation behavior of polymeric backsheets for photovoltaic modules

2014

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This study is designed to understand the ultraviolet (UV) degradation of polymeric backsheets used in PV modules. Commercial photovoltaic backsheets from four suppliers were UV-aged for up to 3000 hours. The aged samples were tested using optical microscopy, scanning electron microscopy (SEM), shrinkage rate test, color measurements, UV-Vis-NIR, Fourier transform infrared spectroscopy (FTIR), and dielectrical tests to study the microstructural, color, chemical and electrical properties. Yellowness Index (YI) and Delta E were used to quantify the color changes which were found in strong correlation with FTIR results. The characters of the surface cracks generated were found to be affected by degree of UV degradation and polymer chain alignment of the backsheets. Electrical properties were not significantly affected by UV irradiation. The results suggest insufficient UV aging time designated in current PV module test standard. A longer aging time is recommended for quality assurance. ACKNOWLEDGEMENT I would like to thank my advisor Dr. Long Jiang for his great help, support, patience and guidance not only during the development and completion of this thesis project, but also through the entire journey of my graduate program. Dr. Shuying Yang, Senior Staff Engineer at MEMC/SunEdison, made a great contribution to this thesis. My supervisory committee members Dr. Chad Ulven, Dr. Dennis Wiesenborn and Dr. Dilpreet Bajwa also offered great help in the development of this thesis. I am also grateful to the help on the part of Scanning Electronic Microscopy provided by Scott Payne and Jayma Moore in NDSU Electron Microscopy Center. The help on the testing of color change and UV-vis-NIR from Instrumental Laboratory Manager, Heidi Docktor in NDSU's Department of Coatings and Polymeric Materials is deeply appreciated. Dr. Haagenson Darrin is sincerely appreciated for his instruction on Fourier Transform Infrared Spectroscopy. Last but not least, my group members of Xuezhu Xu, Yong Wang, David Gutschmidt are also deeply appreciated during the preparation of the thesis defense. v

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“…11,12 The degradation phenomena involved during photo-degradation are common and mainly involve chain scissions and crosslinking reactions. [13][14][15][16] Plastics are subjected to chemical reactions when exposed to the outdoors. In fact, the absence of any type of stabilizer makes it very sensitive to UV light due to the number of structural defects that are acquired either during polymerization or during processing.…”

Section: Nano Impactmentioning

confidence: 99%

Marine plastic litter: the unanalyzed nano-fraction

Gigault

Pedrono²,

Maxit³

et al. 2016

Environ. Sci.: Nano

300

205

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Degradation of polymer blends—IV. Natural weathering of blends of low density with linear low density polyethylene

Cited by 18 publications

References 9 publications

Study on the degradation of low‐density polyethylene in the presence of cobalt stearate and benzil

Study on the degradation of low‐density polyethylene in the presence of cobalt stearate and benzil

Ultra-violet degradation behavior of polymeric backsheets for photovoltaic modules

Marine plastic litter: the unanalyzed nano-fraction

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