Abstract
Glass particles as filler were incorporated in a poly(methyl methacrylate) matrix. The refractive indexes of both materials match at a wavelength of about 400 nm. The effect of particle volume fraction on the light transmittance and light scattering (haze) in dependence of the refractive index difference was studied. The curve shape of the haze in dependence of the wavelength is comparable to that of the refractive index difference, but the base line of the haze increases with the filling grade. This indicates that there are other scattering or absorbing mechanisms, like defects in the filler binding.
Highlights
Specimens show a wavelength- and temperature-dependent extinction curve of the indecent light. Significant work on this subject has been carried out in Japan by the group of Kagawa. They studied the influence on light transmittance, mechanical, and thermal properties of many parameters, such as refractive index difference, particle size, particle surface area, and filler content [3,4,5,6,7,8]
The light transmittance clearly shows the dependence of the refractive index difference because of the different dispersions of the materials
The haze shows a minimum at the wavelength with matching refractive indexes and the change of haze increases with higher filling grade
Summary
By the use of a transparent polymer as a matrix and an optical glass with a matching refractive index n as filler particles, transparency can be achieved for at least one temperature and wavelength of light These transparent composites are expected to have, compared to the bulk material, increased mechanical properties (higher stiffness, increased strengths by the use of fibers) a lower expansion coefficient and an increased thermal conductivity. Specimens show a wavelength- (because of the different dispersion) and temperature-dependent extinction curve of the indecent light Significant work on this subject has been carried out in Japan by the group of Kagawa. Experiments show that the temperature dependence of the polymer changes with the filling grade due to the reduced thermal expansion of the compound
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