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首页> 外文期刊>RSC Advances >Study on poly(tetrafluoroethylene-co-hexafluoropropylene) hollow fiber membranes with surface modification by a chemical vapor deposition method
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Study on poly(tetrafluoroethylene-co-hexafluoropropylene) hollow fiber membranes with surface modification by a chemical vapor deposition method

机译：化学气相沉积法对表面改性的聚四氟乙烯-共聚六氟丙烯中空纤维膜的研究

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摘要

In this paper, poly(tetrafluoroethylene-co-hexafluoropropylene) (FEP) hollow fiber membranes, for applications in water purification, were prepared by a melt-spinning method with FEP as the polymer matrix, water-soluble composite powder as the pore-forming agent and dioctyl phthalate (DOP) as the diluent. Then, a layer of polypyrrole (PPy) was deposited on the surface of the FEP hollow fiber membranes by a chemical vapor deposition method. The microstructures and acid/alkali resistance properties of the FEP/PPy composite hollow fiber membranes were investigated. The results showed that the as-prepared FEP hollow fiber membranes had a multi-microporous structure of stretched pores, interfacial pores and dissolved pores. The sponge-like pore structure was distributed homogeneously over the cross-section of the membrane, which brought about a larger pure-water flux. The polymerization of the pyrrole deposit on the surface of the FEP hollow fiber membranes brought about the improvement of hydrophilicity while the reduction of membrane pore size further resulted in the increase of rejection. The acid/alkali resistance results indicated that the un-deposited FEP hollow fiber membranes had excellent acid and alkali resistance, whereas the alkali resistance was weak after PPy deposition.
机译：本文采用熔融纺丝法，以FEP为聚合物基质，制备了水溶性的聚四氟乙烯-共聚六氟丙烯（FEP）中空纤维膜。复合粉末作为成孔剂，邻苯二甲酸二辛酯（DOP）作为稀释剂。然后，通过化学气相沉积法在FEP中空纤维膜的表面上沉积一层聚吡咯（PPy）。研究了FEP / PPy复合中空纤维膜的微观结构和耐酸碱性能。结果表明，所制备的FEP中空纤维膜具有拉伸微孔，界面微孔和溶解微孔的多微孔结构。海绵状的孔结构均匀地分布在膜的横截面上，从而产生较大的纯水通量。 FEP中空纤维膜表面上吡咯沉积物的聚合带来了亲水性的提高，而膜孔径的减小进一步导致了截留率的提高。耐酸/碱性能结果表明，未沉积的FEP中空纤维膜具有优异的耐酸和耐碱性能，而PPy沉积后的耐碱性较弱。

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