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Supercritical Carbon Dioxide for Sustainable Polymer Processes

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Supercritical Carbon Dioxide for Sustainable Polymer Processes ( supercritical-carbon-dioxide-sustainable-polymer-processes )

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1.3 Physical and Chemical Properties of Supercritical CO2 7 Fig. 1.5 Schematic phase diagram for a pure CO2. (a) The critical point at the critical temperature, Tcr, and the critical pressure, Pcr, marks the end of the vapor-liquid equilibrium line and the beginning of the super- critical fluid region. (b) Density of CO2 as a function of pressure at different temperatures (solid lines) and at the vapor-liquid equilibrium line (dashed line) [44, 45]. ed vapor phases become equal, resulting in the formation of a single supercritical phase. This can be observed in the density-pressure phase diagram (Fig. 1.5 b). The transition from the supercritical state to liquid CO2 is illustrated in Fig. 1.6. In general, supercritical carbon dioxide can be regarded as a viable alternative solvent for polymer processes. Besides the obviously environmental benefits, supercritical carbon dioxide has also desirable physical and chemical properties Fig. 1.6 Transition from the supercritical state to liquid CO2. The line indicates the liquid-vapor interface.

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