Abstract
The structure of polyaryletherketones, including PEEK, confers outstanding chemical resistance (Fig. 1.3). The aryl rings in PEEK are interconnected via ketone and ether groups located at opposite ends of the ring (referred to in chemistry as the “para” position). The resonance stabilized chemical structure of PEEK results in delocalization of higher orbital electrons along the entire macromolecule, making it extremely unreactive and inherently resistant to chemical, thermal, and postirradiation degradation. We have already noted in Chapter 2 that PEEK cannot be damaged by exposure to solvents except for concentrated sulfuric acid. The inherent inertness of PEEK’s chemical structure also explains its biocompatibility, which will be more fully discussed in Chapter 8.
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