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. Author manuscript; available in PMC: 2016 Nov 16.
Published in final edited form as: Biomacromolecules. 2016 Aug 23;17(9):3060–3066. doi: 10.1021/acs.biomac.6b00960

Figure 2.

Figure 2

(Top) ATR-IR of the carbonyl region of (top) PAA standard and (middle) diblock p[(AA)48-b-(nBA)50] in D2O with 500 mM NaCl at the pD’s indicated. (bottom) Plot of pD vs % carboxylate from ATR-IR data of PAA standard (○) and diblock p[(AA)48-b-(nBA)50] (●). Carboxylate percentage was calculated from total carbonyl peak intensities of acid, carboxylate, and new peak at 1710, 1560, and 1672 cm−1, respectively.