Abstract
The nanocomposites composed of polypropylene (PP) and TiO2nanoparticles with uniform dispersion (PP/TiO2nanocomposite) were prepared. The effects of the content of TiO2nanoparticles on the crystallinity of PP and the sorption amount (Ms) of CO2in PP/TiO2nanocomposite were investigated. The crystallinity of PP increased when the content of TiO2was less than 2wt% and decreased Subscript text when the content was over 2wt% (Msof CO2decreased when the content of TiO2nanoparticles was less (2increased from 3 wt% to 5 wt%. The effects of sorption time, extended ranges of temperature and pressure on Msof CO2were also studied by gravimetric method. The mechanism of the sorption and desorption of supercritical CO2in the PP/TiO2nanocomposite was discussed. In addition, the pore density of the microcellular PP/TiO2nanocomposite was controllable by tuning the Ms of CO2.
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