XPS and HREELS Study of the Aluminum/Poly(ethylene terephthalate) Interface and the Influence of the Polymer Surface Pretreatment on Adhesion
Interfacial properties between evaporated metals and polyester films, specially adhesion, are important technological issues in several industrial fields, such as food packaging, audio and video tape and magnetic data storage. The presence of polar functionalities as well as the polymer surface structure are known to be important parameters which affect the metal adhesion on polymers. In this work, poly (ethylene terephthalate) (PET) has been surface modified by various techniques (UV lamp, corona) in order to change its surface structure and chemical composition. Creation and modification of surface chemical functional groups have been analysed by X-ray Photoelectron Spectroscopy (XPS) and a correlation is made with loss or gain of macroscopic adhesion, as measured by peel test. From our results, we also discuss what are the dominating factors that promote the adhesion of a polymer surface with an evaporated metal. Also, some preliminary results of a promising technique, High Resolution Electron Energy Loss Spectroscopy (HREELS), are presented. This vibrational spectroscopy has been used to monitor the in situ creation of an interface between evaporated aluminum and an unmodified PET substrate.
KeywordsPolymer Surface Ethylene Terephthalate Peel Test Weak Boundary Layer High Resolution Electron Energy Loss Spectrometry
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