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Degradation rate of PUs in different media. (a) Acidic medium (0.1 M HCl) for 90 days; (b) Basic medium (0.1 M NaOH) for 90 days; (c) Enzyme medium (esterase) for 21 days. The data are expressed as the mean ± SD (n = 3). Bars with different letters (a–f) indicate significant differences (p < 0.05) between the polyols.
