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. Author manuscript; available in PMC: 2016 Jun 1.
Published in final edited form as: Biomaterials. 2015 Apr 7;54:168–176. doi: 10.1016/j.biomaterials.2015.03.020

Fig. 2.

Fig. 2

Optical images (A-D) and SEM micrographs (E-P) of polymer samples. Hospital TPU (A) appears perfectly round and smooth. The extruded samples (B, C, D) appear smooth and optically transparent similar to the Hospital TPU with the composite samples being nearly indistinguishable from their unmodified counterparts. SEM micrographs consist of cross sectional view (E,F,G,H), top view (I,J,K,L), and roughness profiles (M,N,O,P). Collectively, the extruded samples have large diameters and thicknesses compared to the Hospital TPU due to the extruder die design (Table 1). Plain TPU (F), TPU Composite (G) and Leached TPU Composite (H) have irregular cross sectional slices due to swelling and sample collection during extrusion. Top view and roughness images between all samples appear similar. Optical image scale bar = 7.5 mm, cross sectional and top view scale bar = 200 μm, roughness image scale bar = 600 nm.