Understanding the fundamental relationships between structure, dynamics, and macroscopic properties remains the central challenge in polymer science. This session is dedicated to high-end characterization and polymer physics, driving a deeper comprehension of polymeric materials from the molecular scale to functional devices. The emphasis is placed on elucidating how polymer chain configurations, supramolecular structures, and hierarchical assemblies govern essential properties like viscoelasticity, mechanical robustness, and phase behavior. We will highlight breakthroughs in emerging and advanced characterization techniques, including cutting-edge spectroscopy, scattering, diffraction, and microscopy methods, with a focus on in-situ and operando studies. These methodologies provide unprecedented insights into polymer behavior across multiple length and time scales, particularly during processes like self-assembly, crystallization, and mechanical deformation. By bringing together the latest developments in polymer structure, properties, and characterization, this session aims to provide a comprehensive overview of current research trends and inspire new perspectives in modern polymer science.