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Abstract

4,4′-Ketone dinaphthalene 1,1′,8,8′-tetracarboxylic dianhydride (KDNTDA) was prepared by a new route including six steps with an overall yield of 19%. The structure was confirmed by IR, ¹H NMR and UV spectroscopy. Several novel sulfonated polyimides (SPIs) derived from KDNTDA were synthesized and their structures were characterized by IR and ¹H NMR. Their reduced viscosity ranged from 0.8 to 4.5 dL g^-1 at 35°C. They had good solubility in common aprotic solvents not only in triethylamine salt form but also in proton form. The co-SPIs showed anisotropic membrane swelling with larger swelling in thickness than in plane, while the homo-polymer displayed isotropic membrane swelling. The thermal stability measurements revealed that sulfonic acid group in KDNTDA-based SPIs were stable up to 300°C. They displayed reasonably high proton conductivity, water stability and mechanical properties.

Keywords

4,4′-ketone dinaphthalene 1,1′,8,8′-tetracarboxylic dianhydride sulfonated polyimides solubility proton conductivity water uptake polymer electrolyte membrane

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Synthesis and Characterization of Novel Sulfonated Polyimides Derived from Naphthalenic Dianhydride

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