L3 Phase in a Binary Block Copolymer/Water System

摘要: Block copolymers of the Poloxamer type EO X PO y (with = ethylene oxide and propylene oxide) can form lyotropic liquid crystalline phases in water, as is known for small hydrocarbon surfactants. The phase behavior PE6200 (E0 6 -PO 36 -EO ) investigated more detail concentrations up to 50 wt % temperatures from 0 100 °C. technical product contains about 10 hydrophobic contaminations, which induce clouding at ambient temperatures. These impurities be removed by filtration, but they do not affect subsequent behavior. A lamellar (L α a spongelike 3 are found characterized DSC, SANS, electric birefringence, dynamic light scattering, specific conductivity. transitions decrease linearly with increasing NaCl concentration. In L orientational relaxation time birefringence decreases third power volume fraction reduced diffusion coefficient derived scattering increases conductivity added electrolyte clearly shows bicontinuous structure phase. Comparison systems PE6200/water C 12 5 /water analogies properties different phases.