Anomalous phase separation dynamics under asymmetric viscoelastic effect: Where fluidic and elastic properties meet

摘要

A study was conducted to investigate PMMA/PEO blend with fixed weight ratio at 1/9 where crystallization was totally screened out on experimental time scale. Phase separation dynamics was fast for a shallowly quenched sample and the initial growth mode was located at a small q and grew exponentially before the growth mode shifted to lower qs in the scattering experiment. The optimum growth mode was located at a much smaller q-region than that reported in dynamically symmetric blends, while the initial growth mode was located on the order of molecular sizes in dynamically symmetric blends. The initial growth mode appears at about 1.8 μm~(-1) in the study. The study also reported the initial optimum growth mode at about 3.5 μm~(-1) in an asymmetric polymer solution of polystyrene and dioctyl phthalate.