The liquid-liquid phaseseparation (LLPS) behavior of poly(N-methyl methacrylimide)/poly(vinylidene fluoride) (PMMI/PVDF) blends was studied by using small angle laser light scattering (SALLS)

and the timetemperature dependence of phase-separation behavior was discussed.According to examining the dependence of cloud points (Tc) on heating rate for PMMI/PVDF blends

it was found that Tc decreased as the temperature droped nonlinearly.When the heating rate was higher than 1.0 K/min

only the heating rate could affect the relative intensity I(t)

and the difference of relaxation rate of polymer chain was difficult to be distinguished.Contrarily

both heating rate and relaxation rate of polymer chains could affect the cloud points of PMMI/PVDF blends at lower heating rates because there was enough time for the chain relaxation

and the different relaxation rates could result in the change of Tc.The cloud point curve of PMMI/PVDF blend was obtained at the heating rate of 1 K/min-1.The thermal behavior of PMMI/PVDF blends was measured by differential scanning calorimetry (DSC) and dynamic mechanical analysis (DMA).It was found that PMMI/PVDF exhibited a typical low critical solution temperature (LCST) behavior.Moreover

the temperature dependence of phase-separation kinetics for PMMI/PVDF blends followed the principle of time-temperature superposition (TTS) at the early phase-separation stage and may be described with a WLF-like equation.