Polyurethane Cell Structure Improver: Enhancing Lightweight PU Composite Cores Abstract: Polyurethane (PU) composites are increasingly utilized in various industries due to their excellent mechanical properties, thermal insulation, and design flexibility. Lightweight PU composite cores are crucial for applications demanding high strength-to-weight ratios. This article explores the role of Polyurethane Cell Structure Improvers (PCSIs) in optimizing...