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Ionizing radiation is a growing means of sterilizing medical devices, and is in its infancy as a means of food preservation. These uses require packaging materials which maintain useful properties through a sterilization cycle. In the study presented here, films of sodium and zinc ionomers were exposed to sterilizing doses of gamma and electron-beam radiation, and the effects on mechanical and heat seal properties determined over a one-year period. The results showed that ionomers retain their mechanical properties following radiation. The strength of heat seals is also maintained for ionomers. For a special ionomer which gives both interfacial peelable and fusion seals, depending on sealing temperature, seal strength in the peelable range increased in a predictable fashion following radiation exposure.
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Stability of Surlyn Ionomer Films to Radiation, 1990 Polymers, Laminations & Coatings Conference Pro
