Abstract
This chapter discusses the results of weathering exposure of Ionomer. Ionomers are thermoplastic copolymers that can be processed like thermoplastics and demonstrate mechanical properties like elastomers or cross-linked polymers. Ionomers have poor weathering resistance and must be stabilized if they are exposed to sunlight or outdoor weather. Outdoor weathering experience has confirmed the outstanding performance of UV-stabilized DuPont Surlyn®. Parts containing carbon black have been in service and exposed to all types of weather for over ten years with no significant change in physical integrity or appearance. Other pigmented parts have retained their physical integrity and appearance after five years of exposure to an Arizona environment. Production samples of automotive exterior trim extrusions coated with clear, UV-stabilized Surlyn® and clear, UV-stabilized polyvinyl chloride were exposed side by side in up to 5000 hours of accelerated weathering tests. Besides the obvious edge in UV stability, Surlyn® ionomer resin requires no liquid plasticizer, and therefore there will be no migration problems in the finished part.
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