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SEM images of PCUU. Specimens were imaged under stretched state at λ = 1.0 (a), 1.25 (b), and 1.75 (c) at × 1000 magnification. The PCUU fiber alignment appears to align in the direction of the stretch (indicated by arrow) and the % porosity increased nearly 70% from λ = 1.0 to λ = 1.25.
