Poly(ethylene oxide) (PEO) and poly[oxymethylene‐oligo(oxyethylene)] (PEM) disks are cross‐linked by exposure to 254 nm radiation. The rate of formation of cross‐links is greatly enhanced by the presence of benzophenone, and an average cross‐link density of up to 6 mol % of ethoxy units can be obtained after several hours of irradiation. The highly cross‐linked polymers are insoluble in water or organic solvents and show improved physical properties for handling and the formation of free‐standing films. Scanning calorimetry and polymer swelling are employed to characterize the polymers, and impedance measurements are reported for sodium salt complexes prepared from the cross‐linked polymers. Dynamic modulus measurements show that, upon irradiation, PEO and PEM become cross‐linked, elastomeric solids.
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Sloop et al. (1994) studied this question.
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