Research Article
Intramolecular Lactonization of Poly(α-hydroxyacrylic acid): Kinetics and Reaction Mechanism
Figure 2
1H correlation spectra of PHA (a) at pH 2 and (b) at pH 10. The axes, and , represent the two frequency coordinates in chemical shifts (ppm).
| (a) Correlation spectrum of PHA at pH 2 |
| (b) Correlation spectrum of PHA at pH 10 |