NMR CHARACTERIZATION OF SUBSTITUTED AROMATIC POLY(ETHER SULFONE)S

The synthesis of a variety of substituted bisphenol A polysulfones, in cluding nitro, amino, aminomethyl, ethyl, and methyl derivatives, is d escribed. Nuclear magnetic resonance (NMR) (both proton and carbon, an d several 2-D experiments) data confirm conclusions on the substitutio n site based on arguments on inductive effects in the phenyl rings. Th e proton ortho to the oxygen in the bisphenol A (BPA) residue is repla ced in electrophilic substitution reactions. The degree of substitutio n was also calculated from the NMR results. The ethyl and methyl deriv atives were expected, from the starting reactants, to each have a BPA ring substituted. The NMR data showed that, on the average, this is tr ue. The nitro derivative also has substitution in every BPA ring, whil e the amino and aminomethyl derivatives have only intermittent BPA rin gs substituted. Measured degrees of substitution (DS) varied from 0.11 to 2.25.