A new method to calculate the surface haze

Abstract

AbstractHaze (H) is not an accumulative property based on the addition of internal haze (Hi) and surface haze (Hs) parameters, though the relation (Hs = H − Hi) is widely accepted and used nowadays in research and development of plastic films. To evaluate the correct relation, the analytical relation between the total haze (H) and the haze of a single film (hi) in the film superposition model was firstly concluded, which is 1 − H is equal to the product of 1 − hi of every single film. This relation was validated by the experimental results using thin films of different kinds of polymers with different hazes. Based on this relation, the expression of surface haze was concluded. When the two surfaces of a film were the same, the haze of the single surface $\overline {{H_{\rm{s}}}} = 1 - \sqrt {(1 - H)/(1 - {H_{\rm{i}}})} .$ The mathematical relation between haze and thickness was also obtained.