Figure 8.
(a) TEM image indicating the presence of high-aspect-ratio rod-like aggregates scattered among an amorphous phase. (b) High-resolution TEM image of a single rod-like aggregate; a series of striations are observable along the length of the aggregate; the ends of the rod were well-defined, suggesting aggregation of polymers having similar lengths; shorter polymers are observed at the edge of the structure (indicated by a red line). (c) HRTEM micrograph of a portion of a rod-shaped aggregate of polymer 1 showing two sets of striations. One set runs along the length of the rods, while a secondary set was observed diagonally across the aggregate. The dimensions of these striations coincide with the experimental and calculated interstrand and inter-CuI spacing, respectively. (d) Schematic model of the aggregates where rods of 1 undergo close packing, in which each helix interdigitates into the grooves of its neighbor.