Polymers are essential materials for industrial applications due to their lightweight, flexibility, and processability. Their properties can be extensively controlled by adjusting chemical structures, blending diff erent polymers, and incorporating inorganic materials. However, the connections between microscopic structures and macroscopic properties of polymeric materials (soft materials) are not yet fully understood. Therefore, we have carefully observed the microscopic structures and dynamics within polymeric materials to reveal the microscopic origins of macroscopic properties.