It is reported in this paper that waterborne polyurethane (WPU) can be modified by nanopolyphosphazenes
fibers, which had been prepared containing hydroxyl groups, followed by reaction with WPU. At the same time, physical
blends had also been carried out in the experiments. The results showed that the tensile strength of the WPU films through
chemical modification containing 0.5 wt% fibers is, 1.22 MPa, and that the elongation at break is 1294.50%. This data has
significantly increased when compared against WPU, in which the elongation at break is only 785.50%. The thermal
decomposition temperature of the WPU modified by nanopolyphosphazenes is 50 % higher than that of regular WPU. At
the same time, its preparation method had some influences on the mechanical properties of the composite materials.