The effect of common agrichemicals on the environmental stability of polyethylene films

Yeh, Chung-Liang, Nikolic, Melissa A. L., Gomes, Brunell, Gauthier, Emilie, Laycock, Bronwyn, Halley, Peter, Bottle, Steven E. and Colwell, John M. (2015) The effect of common agrichemicals on the environmental stability of polyethylene films. Polymer Degradation and Stability, 120 53-60. doi:10.1016/j.polymdegradstab.2015.06.007

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Author Yeh, Chung-Liang
Nikolic, Melissa A. L.
Gomes, Brunell
Gauthier, Emilie
Laycock, Bronwyn
Halley, Peter
Bottle, Steven E.
Colwell, John M.
Title The effect of common agrichemicals on the environmental stability of polyethylene films
Journal name Polymer Degradation and Stability   Check publisher's open access policy
ISSN 0141-3910
Publication date 2015-06-22
Sub-type Article (original research)
DOI 10.1016/j.polymdegradstab.2015.06.007
Open Access Status File (Author Post-print)
Volume 120
Start page 53
End page 60
Total pages 8
Place of publication London, United Kingdom
Publisher Elsevier
Collection year 2016
Language eng
Abstract The impact of commonly used agrichemicals (Paraquat, Mancozeb, Chlorpyrifos and Sulfur) on the environmental stability of polyethylene films has been evaluated under accelerated photo-oxidative conditions. Paraquat and Mancozeb when applied to unstabilized clear polyethylene film, followed by exposure to UV radiation, resulted in direct attack of the polymer, evident by faster rates of oxidation and shorter times to embrittlement compared to a polyethylene control. Reapplication of these chemicals during exposure, as often occurs in agricultural practice, resulted in even faster degradation. In contrast, Sulfur and Chlorpyrifos did not have a significant effect on the photodegradation of exposed unstabilized polyethylene film. When the polyethylene film was pigmented (white top layer containing rutile titanium dioxide and carbon black in the bottom layer) and stabilized with the addition of hindered amine stabilizers (HAS), differences in oxidation susceptibility were seen with repeated exposure to Paraquat showing the most dramatic effect. This was evident by an increased carbonyl index, decrease in elongation at break and an increase in tensile stress at yield compared to a control film and other agrichemical treatments. These studies enable degradation from accelerated consumption of stabilizers by the agrichemicals (and their degradation products) to be differentiated from enhanced photochemical initiation of the polyethylene degradation.
Keyword Agrichemical
Hindered amine stabilizer
Mulch film
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
Official 2016 Collection
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