Fig. 3. TEM micrographs of PDMA_m-b-PLLA₄₈ blends of block ratios 20 : 1 (m = 1000) and 3 : 1 (m = 150), at blending ratios of (a) 25 : 75, (b) 50 : 50 and (c) 75 : 25, self-assembled in ethanol at 90 °C for 8 h and cooled to room temperature. Samples were stained with uranyl acetate. Scale bar = 1 μm.