As the multi-chain behaviour described above is kinetically controlled, it is expected to depend on the concentration of the system. Assuming that multi-chain aggregation is a diffusion-limited bimolecular process that occurs via binary collisions (all of which lead to aggregation) between aggregates and is dominated by the aggregation of single chains to give an aggregate of two chains, as shown in ESI Section S9, for the conditions studied here under which aggregation occurs on times scales significantly shorter than R 2 /D, where R is the typical size and D the typical diffusion coefficient of the aggregating species, the aggregation time scale can be approximated as