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Acta Universitatis Sapientiae, Agriculture and Environment

The Journal of "Sapientia" Hungarian University of Transylvania

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2068-2964
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Monitoring the degradation of partly decomposable plastic foils

Gabriella Rétháti / Krisztina Pogácsás
  • Szent István University, Institute of Environmental Sciences, Department of Water and Waste Management Gödöllo
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/ Tamás Heffner
  • Budapest University of Technology and Economics, Department of Physical Chemistry and Materials Science, H-1111 Budapest, Muegyetem
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/ Barbara Simon
  • Szent István University, Institute of Environmental Sciences, Department of Water and Waste Management Gödöllo
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/ Imre Czinkota
  • Szent István University, Institute of Environmental Sciences, Department of Water and Waste Management Gödöllo
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/ László Tolner
  • Szent István University, Institute of Environmental Sciences, Department of Water and Waste Management Gödöllo
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/ Ottó Kelemen / Viktória Vargha
  • Budapest University of Technology and Economics, Department of Physical Chemistry and Materials Science, H-1111 Budapest, Muegyetem
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Published Online: 2014-11-20 | DOI: https://doi.org/10.2478/ausae-2014-0011

Abstract

We have monitored the behaviour of different polyethylene foils including virgin medium density polyethylene (MDPE), MDPE containing pro-oxydative additives (238, 242) and MDPE with pro-oxydative additives and thermoplastic starch (297) in the soil for a period of one year. A foil based on a blend of polyester and polylactic acid (BASF Ecovio) served as degradable control. The experiment was carried out by weekly measurements of conductivity and capacity of the soil, since the setup was analogous to a condenser, of which the insulating layer was the foil itself. The twelve replications allowed monthly sampling; the specimen taken out from the soil each month were tested visually for thickness, mechanical properties, morphological and structural changes, and molecular mass. Based on the obtained capacity values, we found that among the polyethylene foils, the one that contained thermoplastic starch extenuated the most. This foil had the greatest decrease in tensile strength and elongation at break due to the presence of thermoplastic starch. The starch can completely degrade in the soil; thus, the foil had cracks and pores. The polyethylene foils that contained pro-oxydant additives showed smaller external change compared to the virgin foil, since there was no available UV radiation and oxygen for their degradation. The smallest change occurred in the virgin polyethylene foil. Among the five examined samples, the commercially available BASF foil showed the largest extenuation and external change, and it deteriorated the most in the soil.

Keywords : polyethylene foil in soil; capacity; conductivity; tensile strength; elongation at break

References

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About the article

Received: 2014-07-21

Revised: 2014-07-20

Accepted: 2014-05-09

Published Online: 2014-11-20

Published in Print: 2014-11-01


Citation Information: Acta Universitatis Sapientiae, Agriculture and Environment, Volume 6, Issue 1, Pages 39–44, ISSN (Online) 2068-2964, DOI: https://doi.org/10.2478/ausae-2014-0011.

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© 2014. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License. BY-NC-ND 3.0

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