Optical and Physical Properties of SiO2 Nanoparticles and Tetra Ortho Silicate

Abstract

In this article optical and physical property of the composition of polyurethane open cell (PUOC) with two different concentrations of SiO2 nanoparticles (1 and 2wt. %) will be reported. Tetra ortho silicate (TEOS) as an organic agent with different concentrations trations (0.05, 0.1, 0.15 and 0.2 Vol./Vol.) was added to polyurethane composition. Optical microscopy imaging, watering uptake, FTIR and Raman spectroscopy of the synthesized samples were measured. The cell size of samples by adding SiO2 NPs and TEOS was decreased. The PUOC/1wt. % SiO2 was recognized as a best specimen for absorbing water. By focusing on the recorded Raman spectra, it is revealed that PUOC/1wt. % SiO2 and PUOC/200µl TEOS have more covalent bonds than others. The degree of phase separation, DPS, and the hydrogen bonding index, R, in samples were evaluated in terms of their FTIR spectroscopy data. Two samples, PUOC/1wt. % SiO2 and PUOC/800µl TEOS, have the highest R and DPS factors among the synthesized samples. By adding SiO2 NPs and TEOS into to PUOC, the apparent density of foams was increased. This is similar to the behavior of real density in SiO2 NPs into PUOC but by adding TEOS into PUOC, the real density of samples were decreased. The total porosity, open porosity and closed porosity of the synthesized samples were calculated. By adding SiO2 NPs and TEOS into PUOC, the open porosity of samples was increased