本研究探討超臨界二氧化碳在聚碳酸酯(polycarbonate, PC),及聚碸(polysulfone, PSF)中的擴散作用。本研究進行超臨界二氧化碳於40℃及20MPa時，在這兩種高分子之的吸收實驗，並利用費肯擴散模式決定其吸附量M(下標 s)及脫附係數D(下標 d)，計算結果為聚碳酸酯的M(下標s)及D(下標d)數據都比聚碸的值大。利用傳立葉紅外線光譜儀的，發現二氧化碳從聚碸脫附比聚酸酯快，從動態機械分析儀的測量結果，可了解到超臨界二氧化碳對高分子的塑化效果以及玻璃轉移漫度的影響，聚碳酸酯的玻璃轉移溫度改變聚碸的大，表示了聚碳酸酯有較大的塑化程度。
Diffusion and interaction of supercritical carbon dioxide (SCCO2) with polycarbonate (PC) and polysulfone (PSF) is investigated in this study. Experiments on the sorption of SCCO2 at 40℃ and 20 MPa into these polymers were carried out. Both the sorption amount of SCCO2(M(subscript s))and the desorption diffusivity (D(subscript d))were determined by employing Fick's diffusion model. The M(subscript s)and D(subscript d)values for SCCO2 in PC were greater than those in PSF, owing to different interactions of SCCO2 with the polymers in the sorption process. The FTIR spectroscopy results for both polymers showed that CO2 desorbed faster from PSF than from PC. This indicated that the carbonyl group in PC had a stronger interaction with SCCO2. The plasticization effect of SCCO2 on these polymers was also investigated by comparing the DMA measurement results on pure and SCCO2 treated polymers. It is shown that PC had a larger shift in glass transition temperature than that of PSF after the SCCO2 treatment. This implied that there is a greater extent of plasticization on PC.
關聯:
Journal of the Chinese Institute of Chemical Engineers ； 38卷5&6期 (2007 / 11 / 01) ， P419 - 424
