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PBCE*, PBCE, BDG10 and BDG30 polymer films. Representative FESEM images of PBCE* (a–c), PBCE (d–f), BDG10 (g–i) and BDG30 (j–l) surface. The insets show optical photographs (aI,dI,gI,jI) and water contact angle images (cI,fI,iI,lI). Scale bar: (a,d,g,j): 10 μm; (b,e,h,k): 2 μm; (c,f,i,l): 200 nm.
