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Article dans une revue
Erosion as a possible mechanism for the decrease of size of plastic pieces floating in oceans
Abstract : A sea water wave tank fitted in an artificial UV light weathering chamber was built to study the behaviour of polypropylene (PP) injected pieces in close ocean-like conditions. In air, the same pieces sees a degradation in the bulk with a decrease of mechanical properties, a little change of crystal properties and nearly no change of surface chemistry. Weathering in the sea water wave tank shows only a surface changes, with no effect on crystals or mechanical properties with loss of small pieces of matter in the sub-micron range and a change of surface chemistry. This suggests an erosion dispersion mechanism. Such mechanism could explain why no particle smaller than about one millimeter is found when collecting plastic debris at sea: there are much smaller, eroded from plastic surfaces by a mechano-chemical process similar to the erosion mechanism found in the dispersion of agglomerate under flow.
https://hal-mines-paristech.archives-ouvertes.fr/hal-01674359
Contributeur : Magalie Prudon <>
Soumis le : mardi 2 janvier 2018 - 14:47:31
Dernière modification le : jeudi 24 septembre 2020 - 17:22:58
Contributeur : Magalie Prudon <>
Soumis le : mardi 2 janvier 2018 - 14:47:31
Dernière modification le : jeudi 24 septembre 2020 - 17:22:58