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Abstract

The sulfonation of commercially available poly (ether imide) (PEI) (Ultem) was carried out using chlorosulfonic acid (16% w/v) in dichloroethane solution. The effect of temperature (0–60 C) and the duration (1–16 h) of reaction on the extent of sulfonation was investigated. Structural characterization of these sulfonated polymers was done by FT-IR and 1H-NMR spectroscopy. The thermal stability of sulfonated PEI in the N2 atmosphere decreased with the increase in extent of sulfonation. A multistep degradation was observed and the lowest char residue at 800 C was obtained in samples having a high extent of sulfonation.

Keywords

Sulfonation poly(ether imide)sulfonated poly (ether imide)chlorosulfonic acid thermal stability

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Effect of Sulfonation on Thermal Properties of Poly (ether imide) 2

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