薄膜复合膜

Abstract(#br)We report a thin-film composite (TFC) membrane fabrication method based on transfer of a pre-formed, cured active layer onto a microporous support. The active layer is cast on a polyvinyl alcohol (PVA) water-soluble film and cured, then the active side of the bilayer is placed against the skin side of the microporous support and the water soluble layer is dissolved. This method can be used with supports of relatively high pore size and porosity, thus reducing mass transfer resistance from the support.

Abstract(#br)A series of poly(ethylene glycol)- block -poly(pentafluoropropyl acrylate) diblock copolymers were synthesized by Reversible Addition Fragmentation Chain Transfer (RAFT) polymerization. These block copolymers were blended up to 60\u003cce:hsp sp=\"0.25\"/\u003ewt% with commercially available PEBAX ® 2533. The resulting polymer mixtures were successfully spin coated onto cross-linked polydimethylsiloxane (PDMS) gutter layers which in turn had been deposited onto a porous polyacrylonitrile (PAN) support, to form a thin film composite membrane.

Abstract(#br)Hyper-branched polymers comprised of dense polyoxyethylene (POE) comb graft and poly(methyl methacrylate) (PMMA) backbone are prepared with a well-defined chemical structure and the gas transportation properties are investigated. The CO 2 permeation is strongly dependent on the POE weight fraction. To enhance the CO 2 permeability, a thin film layer of the hyper-branched polymers is formed on a polydimethylsiloxane (PDMS) support with thickness less than 60\u003cce:hsp sp=\"0.25\"/\u003eµm, where poly(vinyl alcohol) (PVA) is blended to improve the membrane formability.

一般来说，聚二甲基硅氧烷( PDMS )是制备苯酚分离膜的首选材料。然而，传统的膜制备技术所产生的苯酚传质阻力阻碍了PDMS膜的应用。这里，利用薄膜提离( T-FLO )技术，首次制备了一种由胺基PDMS ( APDMS )纳米薄膜组成的厚度可控的新型薄膜复合( TFC )薄膜。通过改变交联剂组成、聚合物浓度和制备参数，调控APDMS选择性层的化学和物理结构。形成了厚度为234   nm的APDMS纳米膜组成的TFC膜。在温度333.15   K、流量70   rpm、进料浓度400   ppm条件下进行苯酚回收性能试验。优化后的膜具有显著的苯酚总传质系数( 35.6   ×   10-7   m / s )、较高的苯酚回收率( 64.3 % )、良好的长期稳定性和良好的抗污染能力。新开发的APDMS TFC膜在有机酸回收方面显示了一定的潜在应用。