Study on preparation and properties of nano-Fe3O4/hyperbranched waterborne polyurethane
In this paper,nano-Fe3O4 modified by γ-methacryloxypropyltrimethoxysilane(KH570)was introduced into hydrophilic-modified end-hydroxyl hyperbranched containing unsaturated double bonds(Boltorn TMH20)to obbtain nano-Fe3O4 composite hyperbranched waterborne polyurethane curing film by adding photoinitiator and UV irradiation.The structure,magnetic properties and mechanical properties of the products were analyzed by FTIR,XRD and VEM.The results showed that the prepared nano-Fe3O4 composite hyperbranched waterborne polyurethane had good superparamagnetism.The hardness,tensile strength,elongation at break and Young's modulus were 3H,31.88MPa,91.51%and 335.78MPa,respectively,which was about 100%higher than that of hyperbranched waterborne polyurethane without nano-Fe3O4 particles.
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