Abstract: Into polyether polyurethane, different crosslinking agents were introduced, microcrosslinked polyurethane with a crosslinking degree between 0.4 %~7.0 % was prepared via double screws extrusion. With increasing crosslinking degree, the impact strength of the microcrosslinked polyurethane increased, tensile strength decreased, and the elongation at break was not affected. DSC analysis showed that the crosslinking decreased the crystallinity, melting point, and melting enthalpy of polyurethane.

Key words: polyurethane, crosslinking degree, crystallization behavior, modification, mechanincal property