Abstract
The sulphonation of commercially available PEEK in powder form (Gatone™, Gharda Chemicals Limited, India) was carried out using conc. H2SO4 under different reaction conditions. The duration of reaction was varied from 3–5 h, polymer concentration 4–10% (w/v) and temperature 35–50∘C. Structural characterisation of sulphonated polymers was done by elemental analysis, FT-IR and 1H-NMR spectroscopy. The degree of sulphonation as calculated from 1H-NMR and elemental analysis (S-content) was found to be in the range of ∼ 50–80%. Multistep mass loss was observed in thermogravimetric traces (recorded in N2 atmosphere). The first step (50–225 ± 25∘C) was due to loss of moisture (1–10%) and second step (250–425 ± 25∘C) has been attributed to volatilization of SO3 from the sulphonic group. The backbone degradation takes place above 450∘C. The mechanical properties and proton conductivities of various sulphonated samples was also evaluated.
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Muthu Lakshmi, R.T.S., Choudhary, V. & Varma, I.K. Sulphonated poly(ether ether ketone): Synthesis and characterisation. J Mater Sci 40, 629–636 (2005). https://doi.org/10.1007/s10853-005-6300-2
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DOI: https://doi.org/10.1007/s10853-005-6300-2