ABSTRACT Positron Annihilation Spectroscopy (PAS) is reviewed as a powerful technique for characterizing a number of materials, emphasizing the case of polymers. The basic physics of positronium, positron and their interactions with matter are discussed, as well as the equipment required for a PAS experiment. A specific example, namely the grafting of Low Density Polyethylene (LDPE) with Acrylic Acid (AA) and Metacrylic Acid monomers is used to illustrate the use of PAS for characterizing complex polymeric systems.
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