The effect of the distance between the UV radiation source and the surface of the latex pool, or irradiation distance, on the tensile strength and the cross-link density of the PVNR films is shown in Figure 3c. Increasing the irradiation distance from 30 to 45 mm caused a certain increase in the tensile strength and the cross-link density. Further increase in the irradiation distance to 60 mm dramatically reduced both the tensile strength and the cross-link density of the film. The results can be explained by the strong effect of the irradiation distance on the intensity of the irradiation