Effect of stretching condition on the in-plane and out-of-plane birefringence of negative a-plate polystyrene film

Abstract

We have described the relationship between the stretching conditions and the in-plane birefringence and NZ coefficient of the negative A-plate film. As the stretching ratio and the stretching speed were respectively increased of the stretching temperature was decreased, the in-plane birefringence and the NZ coefficient were increased.