The influence of PEG molecular weight on morphologies and properties of PVDF asymmetric membranes

被引:70
|
作者
Zuo, Dan-ying [1 ]
Xu, You-yi [2 ]
Xu, Wei-lin [1 ]
Zou, Han-tao [1 ]
机构
[1] Wuhan Univ Sci & Technol, Key Lab Green Proc & Functionalizat New Text Mat, Minist Educ, Wuhan 430073, Hubei, Peoples R China
[2] Zhejiang Univ, Dept Polymer Sci & Engn, Hangzhou 310027, Zhejiang, Peoples R China
关键词
poly(vinyldiene fluoride); poly(ethylene glycol); components mutual diffusion; phase separation; asymmetric membrane;
D O I
10.1142/S0256767908003072
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
The preparation and properties of asymmetric poly(vinyldiene fluoride) (PVDF) membranes are described in this study. Membranes were prepared from a casting solution of PVDF, N, N-dimethylacetamide (DMAc) solvent and water-soluble poly(ethylene glycol) (PEG) additives by immersing them in water as coagulant medium. Experiments showed that when PEG molecular weight increased, the changes in the resultant membranes' morphologies and properties showed a transition point at PEG6000. This indicated that PEG with a relatively low molecular weight was used as a pore-forming agent to enhance pure water flux and reduce solute rejection of membranes, but PEG was used as a pore-reducing agent with a further increment of PEG molecular weight to result in pure water flux decreasing and solute rejection increasing. Finally, combined with the precipitation rates of different membrane-forming systems, the membrane formation mechanism describing PEG mobility was discussed extensively basing on the length changes of PEG molecular chains and the affinity between PEG and casting solution. The results offered a better understanding of effects of PEG additives on membrane structure and properties.
引用
收藏
页码:405 / 414
页数:10
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