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Novel type of highly soluble and thermally stable poly(sulfone ether imide)s

A sulfone ether diamine was synthesized by three-step reactions. Firstly, 4-(4-nitrophenoxy) phenol was synthesized via nucleophilic substitution reaction of 1-fluoro-4-nitrobenzene with hydroquinone in the presence of K2CO3 in NMP. In the second step, 4-(4-nitrophenoxy) phenol was reduced to 4-(4-aminophenoxy) phenol by Pd/activated carbon catalyst in ethanolic hydrazine hydrate. Finally, 4-(4-aminophenoxy) phenol was reacted with 4,4′-dichlorodiphenyl sulfone (with 2:1 M ratio) to produce the sulfone ether diamine. Then three different kinds of poly(sulfone ether imide)s were prepared by solution polycondensation of synthesized diamine with commercially available aromatic dianhydrides including pyromellitic dianhydride, benzophenonetetracarboxylic dianhydride, and hexafluoroisopropylidene diphthalic anhydride. The structure of synthesized compounds, monomers, and prepared polymers was characterized using 1H NMR and FT-IR spectroscopy and also elemental analysis method. Thermal behavior and stability, solubility, solution viscosity, mechanical properties, crystallinity, water uptake, and optical properties of samples were studied.