膜被增塑化时的气体渗透

PERMEATION BEHAVIOR OF GASES WHEN MEMBRANE PLASTICIZATION OCCURS

二氧化碳通过醋酸纤维素膜的渗透系数，会随气体压力的增加而增大，这种异常行为是由于二氧化碳使膜产生增塑作用的结果，渗透系数的这样一种压力相关性使得含氧化碳的混合气体的渗透行为变得更加复杂，普通的双重吸附模型不能解释这一现象．本文提出了一个新的修正双重吸附模型，它考虑了膜的增塑化，可以说明渗透系数的这种压力相关性，并为实验结果所验证．

he Permeability of CO2 through Cellulose acetate membranes increases dramatically with gas pressure. This anomalous behavior is due to the membranesplasticization by CO2.The unusual pressure dependence of permeability probablymakes permeation behavior of gas mixtures containing CO2 more complex, andsuch a Pers deqendence of Permeability cannot be interpreted in terms of conventional dual-mode model.In thes paper, a new modified dual-mode model wasdeveloped,and was ed to explain the pressure.dependence of Permeability.Thenew model proposed was Verified with experimental data