Solubility of CO2 in solid-state PET measured by pressure-decay method

Abstract

The solubility of CO 2 in solid-state PET was measured using a pressure-decay method. In order to calculate the solubility of CO 2 in the amorphous region of PET, the crystallinity of solid state PET dissolved in CO 2 at different pressures and temperatures was measured by differential scanning calorimetry (DSC). The solubility increases with increasing pressure and it follows a linear relationship and obeys Henry's law when the pressure is below 8 MPa. The effect of temperature on solubility is weak and the solubilities at different temperatures are almost the same under low pressures. At higher pressure, the solubility decreases with an increase in temperature. The solubility of CO 2 in the amorphous region of PET at 373.15 K, 398.15 K and 423.15 K was correlated with the Sanchez-Lacombe equation of state with a maximal correlation error of 6.69%.

Theoretical Background and Automation Approach for a Novel Measurement Method for Determining Dynamic Solubility Limits of Supercritical Fluids in Injection Foam Molding

“…The pressure decay method also uses a pressure chamber that includes the polymer sample under gas pressure . The absorbed amount of gas is calculated from pressure decay over time using the ideal gas law or equation like the Benedict–Webb–Rubin equation . Drawbacks of this method are a long measurement time and the need for highly sensitive pressure transducers .…”

High-pressure phase equilibria of Polystyrene dissolutions in Limonene in presence of CO2

“…4 compares the model prediction and the experimental data for the systems, and it is observed that SL-EoS predicts the experimental data with reasonable accuracy. Furthermore CO 2 solubility in PS has been checked experimentally from high pressure calorimetric analysis to trust the data obtained by the Sánchez and Lacombe model [45,46,51].…”

Molecular-level investigation of plasticization of polyethylene terephthalate (PET) in supercritical carbon dioxide via molecular dynamics simulation

“…A great number of studies have been published on the swelling and mechanical and physical properties of PET in SC-CO 2 . Chen et al [9] investigated the solubility of CO 2 in solid PET and showed a linear relationship with Henry's law at low pressure (less than 8 MPa), and the solubility decreased with the increase of temperature at high pressure. Chen [10] compared the effects of temperature (50 ∼ 120°C) and pressure (0.1 ∼ 20 MPa) on the swelling rate of PET and obtained the polymer glass transition temperature in the supercritical fluid environment by their self-made high pressure autoclave with a view window, which detected the length change of PET film in the CO 2 state via a CCD camera.…”