导光板用聚甲基丙烯酸甲酯基光扩散材料的研究

以光学级聚甲基丙烯酸甲酯(PMMA)为基材,分别添加不同比例的球形二氧化硅光扩散剂A和光扩散剂B,研究了光扩散剂含量、球形粒子大小及粒径分布对材料的透光率、雾度及力学性能的影响。研究结果表明,在光学级PMMA中添加球形二氧化硅光扩散剂能获得良好的光扩散材料。当平均粒径为2μm,添加质量分数为0.4%时,试样的透光率为88.0%,雾度可达90.1%,有效光扩散系数可达79.3%,不仅能明显提高PMMA的拉伸强度,而且对弯曲强度,缺口冲击强度的影响也不大,具有很好的实际应用价值。

Light Diffusion Materials in Polymethylmethacrylate Used in Light Guide Plate

Optical-grade polymethylmethacrylate(PMMA) was acted as matrix material in which spherical silica light diffusion agents A and B were blended respectively with different proportions.The effect of dosage,spherical particle size and size distribution of light diffusion agents on the transmittance,haze and mechanical properties was studied.The studies of spherical silica light diffusion agents in PMMA resin indicate that the light diffusion mate-rials could be prepared.Light diffusion agents can significantly improve the tensile strength while making little influence on the flexural strength and notched impact strength.When the concentration of light diffusion agents was 0.4%(mass fraction),with average particle diameter of 2 μm,the transmittance of light diffusion materials was 88.0%,the haze was 90.1% and the light diffusion coefficient was 79.3%,which has a good practical value.