摘要
建立了小分子在玻璃态高分子膜中吸收和解吸的传递模型。该模型能很好地模拟具有Ｓ形的吸收曲线及对应的解吸曲线，并可推广应用于费克扩散和Ｉ类扩散情形；用不同相对压力下的两条实验吸收曲线可获得小分子在高分子膜中扩散系数随浓度变化的关系，并可预测其它相对压力下的吸收和解吸曲线。与Ｃｒａｎｋ模型进行了比较。
A transport model of penetrants in glassy polymer membranes has been established. The sigmoid sorption curves and corresponding desorption curves can be satisfactorily simulated with this model and can be extended to the Fickian and case II diffusion. Based on this model, a method for evaluating diffusion coefficient concentration relation from experimental sorption and/or desorption curves is suggested. Both the correlated and predicted results agree well with experimental sorption and desorption curves of alcohol in polyimide membrane. It is shown that our model is simple in form and higher in precision comprising with Crank's model.
出处
《华东理工大学学报（自然科学版）》
CAS
CSCD
北大核心
1997年第2期242-248,共7页
Journal of East China University of Science and Technology
基金
国家自然科学基金
关键词
扩散系数
传递模型
高分子膜
吸收
解吸
小分子
diffusion coefficient
transport model
polymer membrane
sorption
desorption
