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以聚全氟乙丙烯(FEP)为成膜聚合物,复合无机粒子为成孔剂,邻苯二甲酸二辛酯(DOP)为稀释剂,采用熔融纺丝工艺制备得到FEP中空纤维膜.分析和讨论了不同成膜体系对FEP中空纤维膜热性能、动态力学性能和力学性能的影响,并对膜的纯水通量和孔径分布进行表征.用扫描电子显微镜(SEM)观察了膜的横断面和表面形貌.结果表明,所得FEP中空纤维膜为由溶出微孔和界面微孔组成的海绵状孔结构.随着成孔剂含量的增加,成孔剂在成膜体系中分散程度变差,容易发生团聚,最终导致膜孔径变大,孔径分布变宽.成孔剂和稀释剂对FEP中空纤维膜的热性能和动态力学性能影响较小.当FEP含量增加到70 wt%时,膜表面容易形成一层致密层,降低了膜的通透性。
The FEP hollow fiber membrane was prepared by melt spinning process with FEP as film-forming polymer, composite inorganic particles as pore former and DOP as diluent. The effects of different film-forming systems on the thermal, dynamic mechanical properties and mechanical properties of FEP hollow fiber membranes were discussed, and the pure water flux and pore size distribution of the membranes were characterized. Scanning electron microscopy (SEM) Surface and surface morphology.The results show that the resulting FEP hollow fiber membrane is a sponge-like pore structure composed of the dissolution micropores and the interface micropores.With the increase of the pore-forming agent content, the pore-forming agent disperses in the film-forming system to some extent Poor, prone to reunion, eventually leading to larger pore diameter, pore size distribution broadening agent and diluent on the FEP hollow fiber membrane thermal properties and dynamic mechanical properties of small.When the FEP content increased to 70 wt% Membrane surface is easy to form a dense layer, reducing the membrane permeability.