论文部分内容阅读
研究了经过４０℃，８．０—１４.０ＭＰａ的超临界二氧化碳溶胀后的６种聚合物ＬＤＰＥ、ＰＰ、ＰＡ６、ＥＶＡ．ＰＳ和ＰＵ中的ＣＯ２解吸情况，模拟了聚合物中ＣＯ２的解吸规律，即以时间的自然指数递减规律，并根据Ｆｉｃｋ扩散定理从理论上推导出ＣＯ２在聚合物中的解吸方程，由解吸方程计算解吸扩散系数，结果表明ＣＯ２的解吸扩散系数数量级达１０－７ｃｍ２／ｓ，解吸扩散系数与ＣＯ２在聚合物中的浓度和温度以及解吸前聚合物在超临界二氧化碳中的压力有关。
Six kinds of polymer LDPE, PP, PA6 and EVA which were swollen by supercritical carbon dioxide at 40 ℃ and 8.0-14.0MPa were studied. PS and PU in the desorption of CO2 in the polymer to simulate the law of desorption of CO2, that natural time-decreasing law, and according to the Fick diffusion theorem derived theoretically CO2 desorption equation in the polymer by the desorption equation The desorption diffusion coefficient was calculated. The results showed that the desorption diffusion coefficient of CO2 was in the order of 10-7cm2 / s. The desorption diffusion coefficient was related to the concentration and temperature of CO2 in the polymer and the pressure of the polymer in supercritical carbon dioxide before desorption.