中文摘要：

以双酚A型聚碳酸酯（PC）为基体、苯乙烯一丙烯腈共聚物（SAN）为散射体，通过熔融共混方法制备了同时具备高透光率和高雾度的高散射聚碳酸酯光散射片，研究了SAN含量对光散射片微观结构和光散射性能的影响，发现透光率和雾度同时随着散射体含量增加而提高的现象．研究结果表明，当SAN含量低于30％时，分散相为球形颗粒，颗粒的平均粒径随着SAN含量的增加而增加，而颗粒的数量浓度则随之减小，这使得其透光率和雾度均随着SAN含量的增加而增加，当SAN含量为30％时，透光率和雾度达到最大值，分别为89．1％和91．7％．并结合Mie散射理论解释说明了透光率和雾度同时随着散射体含量的增加而提高的现象．但当SAN含量的进一步增加，分散相颗粒尺寸已远大于光波的波长，不再适用于Mie散射理论，且部分不再呈球形颗粒，使得PC片的透光率和雾度略有降低．

英文摘要：

High scattering composite sheets are prepared advantages of high transmittance and high haze. Bisphenol A using melt blending processing, with outstanding 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.