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

Meriam Imane Babaghayou, Abdel Hamid I. Mourad, Vicente Lorenzo, María Ulagares de la Orden, Joaquín Martínez Urreaga, Salem Fouad Chabira, Mohamed Sebaa

Research output: Contribution to journalArticlepeer-review

38 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)279-290
Number of pages12
JournalMaterials and Design
Volume111
DOIs
Publication statusPublished - Dec 5 2016

Keywords

  • Characterization
  • Exposed and unexposed faces
  • Heterogeneity in the properties
  • Photodegradation
  • Stabilized and unstabilized LDPE films

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

Fingerprint

Dive into the research topics of 'Photodegradation characterization and heterogeneity evaluation of the exposed and unexposed faces of stabilized and unstabilized LDPE films'. Together they form a unique fingerprint.

Cite this