Abstract
The physical behavior of polymethyl methacrylate-carbon dioxide (PMMA-CO2) system was studied in a wide range of temperatures (0–100 °C) and pressures (0.1–10 MPa). The glass transition temperature of the systems was determined by a new optical observation methodology. The developed procedure is based on the refraction index variations between rubbery and glassy states, which allowed to differentiate both PMMA states for each pair of temperature and pressure conditions. Following this procedure, retrograde behavior was confirmed for three different grades of PMMA, finding significant differences in their behavior. In addition, the study of the glass transition temperature of the PMMA-CO2 systems included the low-pressure and low-temperature region, scarcely studied before. The new results obtained in the low pressure-temperature region are critical to design advanced foaming approaches and manufacturing processes at low temperatures.
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