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Synthesis and characterization of polysilicic acid nanoparticles/waterborne polyurethane nanocomposite
- Kuan, Hsu-Chiang, Su, Hsun-Yu, Ma, Chen-Chi M.
- Journal of materials science 2005 v.40 no.23 pp. 6063-6070
- Fourier transform infrared spectroscopy, light scattering, mechanical properties, nanocomposites, nanoparticles, oxygen, permeability, polyurethanes, silica, temperature, thermal degradation, thermal properties
- A novel nanocomposite that consists of polysilicic acid nanoparticles (PSA)/waterborne polyurethane (WPU) was prepared. The nano-size distribution of PSA particles were measured using the dynamic light scattering method. Nanocomposites were monitered and characterized by Fourier-Transform Infrared spectrophotometer (FT-IR). Si-mapping was used to elucidate the dispersion of silica in the nanocomposite. Morphological investigations revealed that PSA nanoparticles were well dispersed in waterborne polyurethane matrix on the nano-scale (100 nm). Thermal characteristics indicated that adding PSA increased the thermal degradation temperature by 43°C when the content of polysilicic acid nanoparticles was 5 wt%. Mechanical property tests demonstrated that adding polysilicic acid nanoparticles improved the tensile properties (by more than 100%), and reduced the wear index. Oxygen permeability tests showed that introducing the PSA nanoparticles increased the oxygen permeability of the nanocomposite.