Solubility and diffusion coefficient of supercritical-CO2 in polycarbonate and CO2 induced crystallization of polycarbonate |
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| Affiliation: | 1. National Center for Space Exploration Research, Cleveland, OH, United States;2. NASA John H. Glenn Research Center, Cleveland, OH, United States;1. Department of Chemical Engineering, National Taiwan University of Science and Technology, 43 Keelung Road, Section 4, Taipei 106-07, Taiwan;2. Department of Products, Dyeing, Finishing and Environmental Protection Section, Taiwan Textile Research Institute (TTRI), 6 Chengtian Road, Tucheng Dist., New Taipei City 23674, Taiwan |
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| Abstract: | The solubility and diffusion coefficient of supercritical CO2 in polycarbonate (PC) were measured using a magnetic suspension balance at sorption temperatures that ranged from 75 to 175 °C and at sorption pressures as high as 20 MPa. Above certain threshold pressures, the solubility of CO2 decreased with time after showing a maximum value at a constant sorption temperature and pressure. This phenomenon indicated the crystallization of PC due to the plasticization effect of dissolved CO2. A thorough investigation into the dependence of sorption temperature and pressure on the crystallinity of PC showed that the crystallization of PC occurred when the difference between the sorption temperature and the depressed glass transition temperature exceeded 40 °C (T − Tg ≥ 40 °C). Furthermore, the crystallization rate of PC was determined according to Avrami's equation. The crystallization rate increased with the sorption pressure and was at its maximum at a certain temperature under a constant pressure. |
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| Keywords: | Solubility Diffusion coefficient Crystallization Polycarbonate Carbon dioxide |
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