TiO2-based nanosheets （TiNSs）, TiO2-based nanotubes （TiNTs） were prepared by hydrothermal processing, and polyurethane foams with TiO2 nanopowders （P25）, TiNSs and TiNTs were synthesized by free-rising foaming m...TiO2-based nanosheets （TiNSs）, TiO2-based nanotubes （TiNTs） were prepared by hydrothermal processing, and polyurethane foams with TiO2 nanopowders （P25）, TiNSs and TiNTs were synthesized by free-rising foaming method. The Fourier-transform infrared （FT-IR） spectra show that the addition of titanium dioxide does not affect the chemical structure of polyurethane foam. However, microscope observations show that PU/TiNSs composite foams have more uniform cells and the average aperture smaller than that of pure poly-urethane foams. According to the results of thermal analysis, the PU/TiNSs composite foams have better thermal stability, the temperature of decompostion occurring with a maximum weight loss rate is about 30 ℃ higher than that of pure PU foams. The decompostion temperatures are 167 ℃ and 148 ℃ for the PU/P25 composite foams and the PU/TiNTs composite foams respectively, which are lower than that of pure PU foams. Moreover, with the addition of the fillers, the sound absorption property also has changed; the addition of TiNSs improved the sound absorbing property efficiently. The better thermal stability and sound absorption of PU/TiNSs composite foams are mainly due to the uniform cells diffuse and smaller aperture.展开更多
基金Supported by the National Natural Science Foundation of China(21174108)the Fundamental Research Funds for the Central Universities(20102020201000017)
文摘TiO2-based nanosheets （TiNSs）, TiO2-based nanotubes （TiNTs） were prepared by hydrothermal processing, and polyurethane foams with TiO2 nanopowders （P25）, TiNSs and TiNTs were synthesized by free-rising foaming method. The Fourier-transform infrared （FT-IR） spectra show that the addition of titanium dioxide does not affect the chemical structure of polyurethane foam. However, microscope observations show that PU/TiNSs composite foams have more uniform cells and the average aperture smaller than that of pure poly-urethane foams. According to the results of thermal analysis, the PU/TiNSs composite foams have better thermal stability, the temperature of decompostion occurring with a maximum weight loss rate is about 30 ℃ higher than that of pure PU foams. The decompostion temperatures are 167 ℃ and 148 ℃ for the PU/P25 composite foams and the PU/TiNTs composite foams respectively, which are lower than that of pure PU foams. Moreover, with the addition of the fillers, the sound absorption property also has changed; the addition of TiNSs improved the sound absorbing property efficiently. The better thermal stability and sound absorption of PU/TiNSs composite foams are mainly due to the uniform cells diffuse and smaller aperture.
