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Photodegradation characterization and heterogeneity evaluation of the exposed and unexposed faces of stabilized and unstabilized LDPE films

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Babaghayou, Meriam Imane and Mourad, Abdel-Hamid I. and Lorenzo Esteban, Vicente and Orden Hernández, María Ulagares de la and Martínez Urreaga, Joaquín and Chabira, Salem Fouad and Sebaa, Mohamed (2016) Photodegradation characterization and heterogeneity evaluation of the exposed and unexposed faces of stabilized and unstabilized LDPE films. Materials and Desing, 111 (5). pp. 279-290. ISSN 0264-1275

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Official URL: https://doi.org/10.1016/j.matdes.2016.08.065




Abstract

The impact of climatic ageing on the characteristics of both unexposed and exposed faces of unstabilized and stabilized LDPE films was investigated. The effects on chemical and mechanical properties and on the heterogeneity in the films properties were discussed. The exposure periods were 8 and 21 months for the unstabilized and stabilized films, respectively. The ATR-FTIR spectra detected initial presence of vinylidene groups that disappeared after 4 months of weathering for both faces of the unstabilized films and disappeared earlier for stabilized films. It identifies also a progressive evolution of other photooxidation products, i.e. vinyl and carbonyl groups. The stabilized film demonstrated much better mechanical stability. Considerable reduction in the tensile toughness of unstabilized film was observed. The unstabilized film became quite fragile after 6 months of exposure to sunlight to the extent it cannot be tested, while the stabilized film was exposed up to 21 months exhibiting much higher durability. The microhardness MH measurements show increasing trend with weathering time and the impact on the exposed face of the unstabilized film was more severe. The ageing resulted in heterogeneity in the films properties and the MH and ATR-FTIR techniques could be used to evaluate its level.


Item Type:Article
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Received 19 June 2016, Revised 12 August 2016, Accepted 24 August 2016, Available online 29 August 2016.

Uncontrolled Keywords:Stabilized and unstabilized LDPE films; Photodegradation; Exposed and unexposed faces; Characterization; Heterogeneity in the properties
Subjects:Sciences > Chemistry > Plastics industry
Sciences > Chemistry > Materials
Sciences > Chemistry > Environmental conditions
ID Code:43544
Deposited On:04 Jul 2017 11:40
Last Modified:04 Jul 2017 11:40

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