Simulation And Preparation Of Highly Scattering Optical Transmission Polymers

The scattering transmission processes of photons in light scattering materials aresimulated and statistical analysised with an optical software. The effects of optical parameters,i.e.relative refractive index, size, concentration of doped particles, also geometrical structure ofdiffusers, and wavelength of the illumination source, on optical properties are studied of lightscattering materials.The technology path for high transmittance and diffusivity of scatteringmaterials is developed. Light scattering materials with polysiloxane microspheres as the lightscattering agents and Poly(methyl methacrylate as the matrix were prepared by mixed method,the influence of concentration and the particle diameter of light scattering agents ontransmittance and diffusivity were studied and compared with the theoretical values. The resultsshow that:(1) When the relative refractive index is in the range of0.91~0.97or1.03~1.09, thescattering effect is best. When the concentration is constant, with the increase of particle size,the transmittance of light scattering materials increases, the diffusivity decreases. When theparticle size is constant, with the increase of the concentration, the transmittance decreases, thediffusivity increases.(2) As to BaSO4microspheres/Polycarbonate light scattering materials, when the meandiameter of microspheres is6~10μm, doping concentration is0.6V%, light transmittance oflight scattering materials with the thickness of3mm above88.0%, and diffusivity is is highthan95.7%. when the mean diameter of microspheres is8μm, doping concentration is0.4~0.8V%, light transmittance is within the range of88.3%~89.4%, and diffusivity is in the range of96.0%~98.5%.The light scattering performance is excellent.(3) As to polysiloxane microspheres/Poly(methyl methacrylate) light scattering materials.The experimental date and theoretical simulation results are very consistent. The refractiveindexes of polysiloxane microspheres and Poly(methyl methacrylate are well matched, thecontradiction between light transmittance and diffusivity can be resolved, and the doublerequirements of high transmittance and haze can be achieved. when the mean diameter ofmicrospheres is5μm, doping concentration is0.6wt%, total light transmittance of lightscattering materials with the thickness of1mm is88.5%, and diffusivity is89.5%. Furthermore, in the visible light wavelength, total transmittance is almost independent from wavelength. Thechange of diffusivity with the wavelength of light source can also be minimized,Wavelengthdispersive can be avoided effectively.In addition, in order to eliminate the surface reflection and improve the transmittanceperformance of the light scattering material, the preparation process of the polymer nanoporousantireflection coatings were explored preliminary. Nanoporous Poly(methyl methacrylate)antireflection coatings were fabricated by spinning Polystyrene/Poly(methyl methacrylate)blend solution on glass substrates, and then selectively remove the PS phase.The transmittanceincrease about2%compared with glass substrate in the whole visible range.