However, the effects of solvent mixtures and monomer distribution were not yet studied simultaneously. Here, we investigated the solvent responsiveness of block and gradient copoly(2-oxazoline)s in binary water-ethanol mixtures to address the effect of monomer distribution. In addition, we demonstrate the formation of complex selfassembled structures, including toroids and Y-junctions, from a simple amphiphilic statistical copolymer in binary waterethanol solvent mixtures. The structures of the studied amphiphilic poly(2-methyl-2-oxazoline)50-block-poly(2-phenyl-2