Polyurethane Tensile Strength Agent: Enhancing the Robustness of Flexible PU Films Introduction Flexible polyurethane (PU) films are widely used in diverse applications, including coatings, adhesives, textiles, biomedical devices, and packaging, owing to their excellent flexibility, abrasion resistance, and chemical resistance. However, the mechanical properties, particularly tensile strength and elongation at break, often require further enhancement...