用计算机直接试验设计法及SAS软件优化PVDF/PMMA合金膜制备工艺

Optimization of PVDF/PMMA alloy membrane preparation conditions by Random-Design and SAS

采用计算机直接试验设计法(Random-Design)设计聚偏氟乙烯(polyvinylidene fluoride,PVDF)/聚甲基丙烯酸甲酯(polymethyl methaerylate,PMMA)合金膜相转化法制膜工艺方案,再通过 Statistical Analysis System(SAS)软件对实验数据进行统计分析,得到用于表征膜选择性和渗透性的膜表面平均孔径和膜水通量的最优坷归模型方程。实验结果表明,该模型与实际情况较为吻合。通过该模型来优化制膜工艺,可使膜的渗透通量提高95%,膜表面平均孔径从0.40μm 减少至0.2μm,实现膜的选择性与渗透性同时提高。

By random-design with aid of computer and the analysis using the Statistical Analysis System(SAS)software,the prepara-tion conditions of polyvinylidene fluoride(PVDF)/polymethyl methacrylate(PMMA)alloy membranes by means of phase inversionwere optimized.As a result,a fairly reliable multivariate linear regression model about the relationship between the alloy membranes'performance(the mean pore size of the membrane skin and membranes' pure water flux)and its major influencing factors was ob-tained.According to the model,the membranes' pure water flux can be increased 95% while the mean pore size reduced from 0.40μmto 0.24μm,which means that the alloy membranes' permeability and selectivity can be raised at the same time.