Community Research and Development Information Service - CORDIS

An investigation into metal polyester interface properties

Several of the major uses of polyethylene terephthalate (PET) film, like film capacitors, barrier packaging and metal evaporated videotapes require its metallisation. The role of the interface in these applications is crucial: as capacitor films become thinner, the importance of the interface grows; it determines gas barrier and metal adhesion in packaging applications as well as epitaxy of magnetic alloys in videotapes. This project therefore investigates the chemical and physical phenomena at the interface in order to sustain the fast technological change in the above industries.

A model of the aluminium polyester interactions has been developed and values of volume and surface conductivity applicable to aluminium metallised ultrathin films have been determined. Variations in the insulation resistance of heat treated and compressed capacitors have been explained and eliminated and a model for carrier injection at the interface has been established. Appropriate adhesion measurement techniques have been developed and different surface treatments to improve adhesion have been compared. The influence of the polyester manufacturing and processing conditions on gas barrier and metal adhesion has been assessed and the surface topography needed for the epitaxial growth of magnetic alloys has been defined. A metal evaporated tape based on cobalt nickel oxide on PET has also been developed.

Reported by

Du Pont de Nemours SA
2984 Luxembourg
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