Fracture behaviour of poly[ethylene–(vinyl alcohol)]/organo-clay composites
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Data publicació2009-04-14
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Abstract
BACKGROUND: Ethylene–(vinyl alcohol) (EVOH) copolymer/organo-modified montmorillonite (OMMT) composites were
investigated. Composites with two different percentages by weight of OMMT were prepared using a melt-extrusion procedure
in a twin-screw extruder, using EVOH asmatrix. Filmsmade of EVOH and EVOH/OMMT composites were prepared in a cast-film
extrusion line.
RESULTS: The mechanical properties were evaluated by tensile tests and the fracture behaviour was analysed using the
essential-work-of-fracture (EWF) method. Fracture characterization was carried out for the two main processing directions:
melt flow direction and transverse direction. Fractographic observations were made using scanning electron microscopy.
CONCLUSION: The tensile test results indicated good compatibility between EVOH and OMMT. In addition, the fracture tests
showed the influence of the clay particle arrangement on the fracture behaviour, showing an increase in the specific essential
work of fracture, we, which was attributed to the EVOH–OMMT interaction. The plastic term, βwp, showed different trends
depending on the test direction, explained by the size of the plastic zone and the restrictions to the EVOH plastic flow promoted
by the clay particles. In this sense, the EWF method is shown to be a very useful tool for the analysis of structure–property
relationships in polymer–organo-clay composites.
CitacióMaspoch, M. [et al.]. Fracture behaviour of poly[ethylene–(vinyl alcohol)]/organo-clay composites. "Polymer international", 14 Abril 2009, vol. 58, p. 648-655.
ISSN0959-8103
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FRACTURE BEHAVI ... AY COMPOSITES_numbered.pdf | Research Article | 398,6Kb | Accés restringit |