For example, compared to linear double hydrophilic block copolymers (DHBC) star-shaped block copolymers show a higher density of functional groups, increased loading capacities, and lower aggregation numbers. Furthermore, the behavior of polymers in solution especially with regard to viscosity and solubility is also influenced by the topology. Star-shaped double hydrophilic copolymers are in comparison to their linear counterparts a rather unknown field of polymer chemistry as this architecture brings unique difficulties in its synthesis. In general, they are synthesized via controlled radical polymerization techniques (CRP), but side reactions such as star-star coupling, or the temporally unequal or only proportional initiation of adjacent arms need to be avoided. The CRP methods mainly include nitroxide mediated polymerization (NMP), atom transfer radical polymerization (ATRP), or reversible addition fragmentation polymerization (RAFT). In 2019 Hawker et al. reported on minimizing star-star coupling in Cu(0)-mediated controlled radical polymerizations. They synthesized different star-shaped homo and block copolymers using a variety of acrylates resulting in conversions up to 95% and dispersities (Đ) below 1.2 and investigated critical factors like the influence of arm length, the number of arms, or the monomer side chain used. Later in 2020 Lin et al. reported star-shaped double hydrophilic copolymers containing pH-responsive blocks describing the synthesis and the dual pH-responsive behavior of starshaped poly(4-vinyl pyridine)-block-poly(acrylic acid) (P4VP-b-PAA) diblock copolymers. According to their results, full protonation of both groups occurs under acidic conditions leading to a cationic polymer species and good water solubility. Consequently, at high pH values deprotonation of the acidic group leads to an anionic species. In between those extremes, at pH 5-8, aggregation of the polymers occurs due to the presence of both, positive and negative charges and, thus, the formation of complexes. In principle, many recent examples focus on the increase of conversion or the suppression of side reactions. However, no, or little attention was paid to the number of repeating units actually required to influence solution properties of star-shaped (block) copolymers.