3.3.1. Effect of rod/coil ratio
Leclere and coworkers described the synthesis and characterization of PF-b-PEO block copolymers with different block ratio and molecular architectures in THF [20]. Copolymers with a low volume ratio of PEO exhibited a well-defined organization into nanoribbons. A model of the chain packing was proposed in which the conjugated chains were π-stacked parallel to each other, edge-on over the substrate, with the PEO chains alternating on each side of the ribbon ( Fig. 20). For the copolymers with a higher average volume ratio of PEO, the organized structures disappeared and led to untextured aggregates, probably because a long-range, regular π–π stacking of the segments could no longer take place.