| 摘要: | 本研究主要目的為探討非結晶型高分子聚碸(PSF)在超臨界二氧化碳(scCO2)中之發泡狀態，並觀察非結晶高分子在超臨界二氧化碳(scCO2)以各種不同的操作條件下對物理性質的影響與孔洞形貌的變化。
首先，本研究使用熱壓機將高分子壓製成150mm*150mm*2mm的方塊模板，再裁切為10mm*10mm*2mm的試片。再藉由改變發泡的壓力(28MPa~41MPa)、發泡的溫度(140℃~160℃)、洩壓速度、飽和時間(3hr)等操作條件下，去觀察各個發泡條件對製備PSF發泡材料的影響。使用掃描式電子顯微鏡(SEM)拍攝並觀察孔洞的形貌的變化，再使用熱式差掃描卡量計(DSC)去測量焓值與熔點。最後再使用電腦軟體去計算孔洞的直徑(di)平均大小(Davg)、平均密度(Nf)。
在孔洞型態變化上，研究結果發現，當發泡的溫度增加時，孔洞平均大小(Davg)回隨著溫度上升而增加，但孔洞密度(Nf)會因此而減少，當發泡的壓力提升時孔洞的平均大小(Davg)會隨著壓力的上升而減少，但孔洞密度(Nf)會因此而變大。最後，本實驗發現，實驗必須到達飽和時間才能影響孔洞型態的變化。
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. |
