We explain the formation of larger aggregates at lower pH values due to the increasing formation of Hbonds within the PDha segments as well as an overall decreased solubility in aqueous media, as also discussed above. Overall, a similar trend for the solution behavior of [PEG-b-PDha]4 star-shaped block copolymers is observed: decreasing solubility at lower pH due to the pH-responsive PDha segments. It seems that even short PDha block lengths of 6-7 repeat units per arm are sufficient to significantly influence the solution behavior of the materials, depending on pH.