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- W2317992739 abstract "The effects of the filler size and concentration on the solubility and diffusivity of CO2 in polypropylene (PP)/calcium carbonate (CaCO3) composites were investigated in this work. The apparent solubility of CO2 in PP and its composites containing 5 wt % and 10 wt % micro- or nano-CaCO3 was measured by using a magnetic suspension balance (MSB) at temperatures of 200 and 220 °C and CO2 pressures up to 22 MPa. Meanwhile, the swelling volume of the PP composites/CO2 solutions was experimentally measured at the same conditions by using a high-pressure view cell with direct visual observation. It was then used to correct the gas buoyancy acting on the PP composites in the MSB measurement so that the real solubility of CO2 in the PP composites was determined. Meanwhile, the diffusion coefficient of CO2 in the PP composites was estimated from the sorption lines at gas pressures ranged from 5 to 10 MPa. It was found that the experimental solubility and diffusivity of CO2 in PP/nano-CaCO3 composites were higher than those in PP/micro-CaCO3. Moreover, the solubility and diffusivity of CO2 decrease with increasing micro-CaCO3 concentration whereas they increase with increasing nano-CaCO3 loading in the PP composites. Two new models based on free volume theory considering the effects of micro-CaCO3 on the free volume and the diffusion path and the lubricant effect of nano-CaCO3 were proposed and used to well correlate the experimental diffusion coefficient of CO2 in PP/micro-CaCO3 and PP/nano-CaCO3 composites, respectively." @default.
- W2317992739 created "2016-06-24" @default.
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- W2317992739 date "2013-04-01" @default.
- W2317992739 modified "2023-09-25" @default.
- W2317992739 title "Experimental Measurements and Modeling of Solubility and Diffusivity of CO<sub>2</sub> in Polypropylene/Micro- and Nanocalcium Carbonate Composites" @default.
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- W2317992739 doi "https://doi.org/10.1021/ie303587r" @default.
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