| Summary: | 碩士 === 中國文化大學 === 化學工程與材料工程學系奈米材料碩士班 === 103 === The purpose of the research was to identify the foaming state of amorphous polymer polysulfone (PSF) in supercritical carbon dioxide (scCO2), and observe the effect of changes in pore morphology and physical properties with a variety of operating conditions.
First, the present research used an precise heating molding and polymer pressed into 150mm * 150mm * 2mm box template, and then cut into a 10mm * 10mm * 2mm test piece. Then by changing the foaming pressure (28MPa ~ 41MPa),the foaming temperature (140 ℃ ~ 160 ℃), relief rate, under saturation time (3hr) and other operating conditions, to observe the conditions of each foam made PSF material. Using a scanning electron microscope (SEM) and observe the changes in the morphology of the hole,, then use a thermal differential scanning calorimetry (DSC) to measure the enthalpy and melting point. Finally, the utilization of computer software to calculate the cell diameter (di) average size (Davg) and the cell average density (Nf).
In the cell morphology, the results found that when the temperature of the foam increases, the average size of the cell (Davg) will increase as the temperature rises, but the cell density (Nf) will therefore decrease when the pressure foaming upgrade. The average size of cell (Davg) increase as the pressure is reduced, but the cell density (Nf) will thus become larger. Finally, the experiment found that saturation time must be reached to affect change patterns of cell morphology.
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