Sorption and dilation in poly(ethyl methacrylate)–carbon dioxide system

Abstract

Sorption and dilation in the system poly(ethyl methacrylate) (PEMA) and carbon dioxide are reported for pressures up to 50 atm over the temperature range 15–85°C. The sorption isotherms were obtained gravimetrically. The dilation accompanying sorption was measured directly with a cathetometer. At low temperatures the sorption and dilation isotherms were concave toward the pressure axis in the low‐pressure region and turned to convex with increasing pressure. As the experimental temperature approached and exceeded the glass transition temperature of 61°C, both isotherms became convex or linear over the whole range of pressure. Partial molar volumes of CO2 in PEMA were obtained from sorption and dilation data, which were described well by the extended dual‐mode sorption and dilation models developed recently. The temperature dependence of the dual‐mode parameters and the isothermal glass transition are discussed.

Hydrocarbon and fluorocarbon solubility and dilation in poly(dimethylsiloxane): Comparison of experimental data with predictions of the Sanchez-Lacombe equation of state

“…These values are reported in Table V at infinite dilution. Similar to previous reports, 31 the polymer compressibility term usually introduces a negligible contribution to eq. (15) for more soluble gases and vapors (e.g., CO 2 , C 2 H 6 , C 3 H 8 , etc.).…”

Carbon dioxide-poly(vinylidene fluoride) interactions at high pressure

“…The same phenomena (an increase of the partial molar volume with temperature) has been reported by Kamiya et al in polybutadiene 34 and in poly(ethyl methacrylate). 35 In contrast, Weiss has found that for carbon dioxide in water no significant variation in the partial molar volume was observed as a function of temperature (range 12-40°C) and pressure (range 25-500 atm). 36 The invariant value was 32.3 Ϯ 0.5 cc/mole.…”

The sorption behaviors in PLLA-CO2 system and its effect on foam morphology

“…The measurement of the T g of polymer in compressed CO 2 using high pressure DSC requires the sample exposing to compressed gas for enough time to reach equilibrium at a certain temperature and pressure followed by carrying out the heating or cooling runs. However, the equilibrium CO 2 concentration varies depending on the DSC program temperature, which decreases with an increase in temperature [22,30]. Parker et al [31] investigated the T g of PLA in CO 2 using geometry measurement.…”