Investigation of the Microcellular Foaming and Diffusion of Supercritical Carbon Oxide in the Polypropylene/TiO₂ Nanocomposites

Abstract:

The nanocomposites composed of polypropylene (PP) and TiO₂ nanoparticles with uniform dispersion (PP/TiO₂ nanocomposite) were prepared. The effects of the content of TiO₂ nanoparticles on the crystallinity of PP and the sorption amount (M_s) of CO₂ in PP/TiO₂ nanocomposite were investigated. The crystallinity of PP increased when the content of TiO₂ was less than 2wt% and decreased Subscript text when the content was over 2wt% (M_s of CO₂ decreased when the content of TiO₂ nanoparticles was less (2 increased from 3 wt% to 5 wt%. The effects of sorption time, extended ranges of temperature and pressure on M_s of CO₂ were also studied by gravimetric method. The mechanism of the sorption and desorption of supercritical CO₂ in the PP/TiO₂ nanocomposite was discussed. In addition, the pore density of the microcellular PP/TiO₂ nanocomposite was controllable by tuning the Ms of CO₂.

• Periodical: Advanced Materials Research (Volumes 557-559)
• Pages: 342-348
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.557-559.342
• Online since: July 2012
• Authors: San Jiu Ying, Cai Feng Li, Yuan Xiang Luo
• Keywords: Diffusion Rate, Nanocomposite, Porous Structure, Sorption Amount, Supercritical CO₂

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