High scattering composite sheets are prepared using melt blending processing

with outstanding advantages of high transmittance and high haze.Bisphenol A polycarbonate (PC) is treated as matrix and poly-(styrene-co-acrylonitrile) (SAN) is dispersed phase.The effect of SAN content on the light scattering properties is investigated and the microstructure is analyzed through SEM.Both transmittance and haze increase simultaneously with the increase of SAN content

which is rarely reported before.The shape of dispersed phase is spherical when SAN content is less than 30%

and then the average particle diameter increases and the number concentration decreases with the increasing SAN content.Both transmittance and haze increase with the increasing content of SAN and reach a maximum value at an SAN content of 30%

where transmittance is 89.1% and haze is 91.7%.Mie scattering theory is used to analyze the influence of the scattering particle diameter and number concentration on the light scattering properties.With the further increasing of SAN content

the dispersed phase tends to have large size with irregular shape

and the light scattering property decreases

which cannot be analyzed using Mie scattering theory because the particle diameter is much greater than the incident light wavelength.