Degradation of PEUU/collagen scaffolds with varying PEUU/collagen ratio in the presence (solid lines) or absence (dashed lines) of collagenase. All scaffolds were made from 10% PEUU solution and quenched at −80°C. Brackets represent differences in mass loss due to collagenase at 56 days for the four types of scaffolds examined. (a) PEUU/collagen 100:0 without collagenase, (b) PEUU/collagen 100:0 with collagenase, (c) PEUU/collagen 90:10 without collagenase, (d) PEUU/collagen 90:10 with collagenase, (e) PEUU/collagen 80:20 without collagenase, (f) PEUU/collagen 80:20 with collagenase, (g) PEUU/collagen 70:30 without collagenase, (h) PEUU/collagen 70:30 with collagenase.