“…[30][31] The aggregates formed Phase-separation in polymer blend films depends on molecular (i.e., polymer solubility, miscibility of two polymers, surface energy of substrate, and volatility, viscosity, and surface tension of solvent), thermodynamic (i.e., composition, temperature, and pressure) and processing parameters (i.e., film deposition method). 6,8,27,32 In general, the effect of polymer solubility has been widely taken into account to understand the phase-separation of polymer blends during a spin-coating process. 27 In contrast to the blend films spin-coated from the untreated solutions, those obtained from UV irradiated solutions exhibit three apparently different parts, featureless, island-like, and nanofibrillar ( Figure 2a).…”