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Light Diffusion Materials in Polymethylmethacrylate Used in Light Guide Plate

DUAN Yu1,MA Wen-shi1,WAN Zhao-rong2,WANG Hong3(1.School of Materials Science and Engineering,South China University of Technology, Guangzhou 510640,China 2.Guangzhou Keyuan Innovative Materials Co.,LTD,Guangzhou 510860,China; 3.School of Science,South China University of Technology,Guangzhou 510640,China)  
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.
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