膜科学与技术

聚偏氟乙烯接枝共聚物纤维膜的制备及油水分离研究

作者：许飞，尤蒙，张树友，王华，孟建强

单位：天津工业大学，分离膜与膜过程国家重点实验室，材料科学与工程学院，天津 300387

关键词：聚偏氟乙烯；接枝共聚物；静电纺丝；油水分离；抗污染

出版年,卷(期):页码： 2022,42(1):88-97

摘要：

本文以原子转移自由基聚合制备聚偏氟乙烯(PVDF)接枝聚乙二醇单甲醚甲基丙烯酸酯(OEGMA)共聚物(PVDF-g-POEGMA)，再用静电纺丝技术制备PVDF-g-POEGMA纤维膜，最后经过热处理工艺使共聚物中亲水链段在膜表面富集以改善膜的亲水性能，得到用于油水分离的PVDF静电纺丝纤维膜 (PVDF-g-POEGMA-w)。结果表明，PVDF-g-POEGMA-w膜的水接触角在5 s内从 85o变成0o，拉伸强度为2.7 MPa，爆破压力为3.01 kPa。在“死端”过滤装置中，改性膜在10 cm高度液柱驱动下分离分散油，其水通量为11630 L/(m2h)，表现出高通量的优点，对乳化油和分散油的截留率均为99%以上。经过3次循环污染测试，改性膜的通量恢复率保持在91%以上，表现出良好的抗污染能力。

The PVDF graft copolymer was prepared by grafting oligoethylene glycol monomethyl ether (OEGMA) onto the PVDF via atom transfer radical polymerization (ATRP). The hydrophilic PVDF-g-PEGMA-w fibrous membrane was prepared using electrospinning technology containing a heat treatment process, to improve the hydrophilicity. The results showed that water contact angle of the PVDF-g-POEGMA membrane decreased from 85 o to 0° within 5 s, the tensile strength was 2.7 MPa, and the oil intrusion pressure was 3.01 kPa. During the “dead-end” filtration, the water flux of filtering the dispersed oil mixture reached up to 11,630 L/(m2h) under the gravity-driven condition. During cross-flow oil/water emulsion filtration, the PVDF-g-PEGMA-w membrane exhibited a high water flux and a separation efficiency higher than 99% for several oil/water emulsions. After 3 cycles of fouling tests, the flux recovery rate of the modified membrane remained above 91%, exhibiting excellent antifouling property.

许飞（1996），男，辽宁锦州人，硕士生，油水分离膜研究

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