Structural effect of the microgels with a core‐shell morphology synthesized from poly(α‐methylstyrene‐b‐methyl methacrylate) on the swelling behavior of the microgel

The swelling behavior of the core‐shell microgels [32 mol % poly(methyl methacrylate) (PMMA) core and 68 mol % poly(α‐methylstyrene) (PMeSt) shell], the random mixing microgels with 32 mol % PMMA and 68 mol % PMeSt, and the PMMA microgels was investigated in two solvent systems (toluene/n‐hexane and benzene/n‐butanol) by turbidimetric titrations from the viewpoint of the structural effect of the microgels. All coreshell microgels did not precipitate in the solvent in which the material block copolymer had perfectly precipitated. For the core‐shell microgels, the flat regions appeared on the way to perfect turbidity. From the measurement of the composition of the solvent swollen in the polymers and the microgels, it was determined that these anomalous phenomena were due to the properties of the polymer micelles in the core‐shell microgels.