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以双酚A型聚碳酸酯(PC)为基体、苯乙烯-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.
Using bisphenol A polycarbonate (PC) as matrix and styrene-acrylonitrile copolymer (SAN) as scatterer, high-scattering polycarbonate with high transmittance and high haze was prepared by melt blending The effect of SAN content on the microstructure and light scattering properties of light scattering films was studied. The results showed that the light transmittance and haze increased with the increase of scattering volume. The results show that when the content of SAN is less than 30 %, The dispersed phase is spherical particles, the average particle size of particles increases with the increase of SAN content, while the concentration of particles decreases, which makes the light transmittance and haze increase with the SAN content , And the maximum transmittance and haze reached to 89.1% and 91.7% respectively when the SAN content was 30% .According to the Mie scattering theory, the results showed that the transmittance and haze were the same as the content of the scatterer However, when the content of SAN is further increased, the particle size of disperse phase is much larger than the wavelength of light wave, which is no longer suitable for Mie scattering theory and some of them are no longer spherical particles, Degree slightly lower.