【摘要】 在不同蒸气活度下,通过吸附动力学实验,测定了蒸气状态的水分子簇在聚丙烯酰胺(PAM)膜中的动态吸附曲线,改进了ENSIC模型并用于计算水分子簇在膜内的扩散系数。结果显示,随着水蒸气活度的增加,膜内水分子簇尺寸增大,并在膜的微孔内产生多层吸附甚至毛细管冷凝,导致扩散系数迅速降低。更多还原

【Abstract】 Water vapor exhibits some unusual transportation behaviors in polymer membrane compared with permanent gases. Dynamic sorption curves of water vapor with different activities in polyacrylamide(PAM) membrane are measured, and diffusion coefficients of water clusters in PAM membrane are calculated with modified ENSIC model. With the increase of mean cluster size(MCS)at different water activities, multi-layer sorption and capillary condensation occur, which lead to the diminution of diffusion coefficients in PAM membrane.更多还原