Synthesis and performance of hydroxyl‐terminated polysiloxane‐modified polyurethane acrylate films as potential flexible hydrophobic materials

Abstract Hydrophobic materials possess exceptional properties, making them extensively useful in daily production and life. However, developing low‐cost and flexible hydrophobic materials remains a challenging task. In this study, a series of composite emulsions were prepared by introducing hydroxyl‐terminated polydimethylsiloxane as a modifier into polyurethane acrylate via a solvent‐free approach. The composite emulsions were then used to fabricate polymer films using the solvent evaporation technique. The effects of varying siloxane content on the properties of composite emulsions and polymer membranes were examined. The results showed that increasing the siloxane content improved the hydrophobic properties and flexibility of the film materials. Fourier transform infrared spectroscopy confirmed the introduction of the SiOSi group into the polyurethane chain structure, the absorption peak for asymmetric stretching vibration of SiOSi is at 1100 cm −1 . The mechanical properties test revealed that the film had excellent elongation at break (278.96 ± 0.01%), and a hydrophobic surface with a contact angle of 101.94° was obtained. The composite materials showed improved water resistance and thermal stability with the increase in siloxane content. The hydrophobic film is a promising material for application in decoration, architecture, and flexible wearable devices.