Phase separation and structure control in ultra-high molecular weight polyethylene microporous membrane

► We differentiate L-L phase separation from crystallization for UHMWPE and LP blend. ► L-L phase separation temperature is obtained by the “inverse quenching” method. ► Rheological measurements are more sensitive to the microstructure change. ► The properties of UHMWPE membrane depend on quenching depth and annealing time.