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In vitro surface degradation of 4000PEOT30PBT70 and poly(ester urethane films over 34 weeks. SEM images of the surface of the pH 9 PBS‐treated 4000PEOT30PBT70 (a)–(c) and poly(ester urethane) (d)–(f) films at different time points. Weight loss over time (n = 3) of the (g) 4000PEOT30PBT70 films at week 0, 1, 3, 5, 6, 12 and 34 and (h) poly(ester urethane) films at week 0, 1, 3, 5, 12, 15 and 34 by incubation in PBS at pH 5, 7.4 or 9
