Diphenolic Acid, DPA [bis(4‐hydroxyphenyl)pentanoic acid] can be made from cellulose‐rich waste. The t‐butyl ester was converted to homo‐ and copolycar‐ bonates (with bis‐phenol‐A, BPA). Deblocking the ester yielded polycarbonates with pendent carboxyl groups that exhibit all the properties of polyelectrolytes and retain solubility in aqueous base without degradation for long periods.
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Zhang et al. (2003) studied this question.