Abstract
Hydroxy silicone oil were employed to modify waterborne polyurethane (WPU) by copolymerization reaction. Their structures and properties of Si-WPU were characterized by FTIR, DLS, TEM, TG-DSC, XPS, SEM, AFM and so on, respectively. The results showed that the WPU was successfully modified with hydroxy silicone oil. The surface roughness of the Si-WPU film was significantly improved. The Si-WPU film of the initial decomposition temperature was increased by 62–70°C, the glass transition temperature (Tg) was enhanced by about 60°C, the crosslinking density of the WPU and the tensile strength gradually were also significantly enhanced. The performance of WPU modified with 25000 molecular weight hydroxyl silicone oil(13%,w/w) is by far the best, and the tensile strength properties of the Si-WPU film were significantly enhanced by 2.63MPa. The contact angles of Si-WPU film were improved by 93.95°, 98.67°, and 103.95°, respectively. The water absorption rates were enhanced by 4.17%, 5.21%, and 7.41%, respectively. The corresponding surface energy was also reduced to as low as 13%. It is shown that water resistance, heat resistance, and the microphase separation of the Si-WPU was notablely enhanced, respectively.