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The surface tunability and dye separation property of PVDF porous membranes modified by P(MMA-b-MEBIm-Br): effect of poly(ionic liquid) brush lengths
Journal of Polymer Research ( IF 2.8 ) Pub Date : 2020-03-03 , DOI: 10.1007/s10965-019-1956-5
Chunhui Du , Xinyi Zhang , Xumin Ma

In order to obtain the tunable and charged surface of the membranes, polymerized ionic liquid(PIL) block copolymers poly (methyl methacrylate) (PMMA)-b-poly(1-[(2-methacryloyloxy)ethyl]-3-butylimidazoliumbromide) (PMEBIm-Br) with different poly(ionic liquid) brush lengths were synthesized by RAFT polymerization method and used in the fabrication of poly(vinylidene fluoride) blend membranes. Chemistry analysis confirmed the successful copolymerization of P(MMA-b-MEBIm-Br) with different chain lengths of PMEBIm-Br blocks, and the PIL groups was also detected on the surface of the blend membranes, which contributes to the hydrophilic and positively charged surface of the membrane. These properties were further enhanced by the chain length of PMEBIm-Br blocks in the copolymer. The surface wettability of the membranes can be regulated from hydrophilicity to hydrophobicity by anion exchange, and the water flux changes also confirmed these phenomena. In addition, the effects of PMEBIm-Br blocks on the separation properties of the membranes were investigated using two dyes, namely, orange G and rhodamine 6G. Results indicated that the blend membranes with long length of PMEBIm-Br blocks had high rejection and good antifouling property to rhodamine 6G. Furthermore, the adsorption experiment of the blend membranes to the two dyes also indicated that blend membranes with long length of PMEBIm-Br blocks would have good dye adsorption-separation property.



中文翻译:

P(MMA-b-MEBIm-Br)改性的PVDF多孔膜的表面可调性和染料分离特性:聚离子液体刷长度的影响

为了获得可调节且带电的膜表面,聚合的离子液体(PIL)嵌段共聚物是聚(甲基丙烯酸甲酯)(PMMA)-b-聚(1-[((2-甲基丙烯酰氧基)乙基] -3-丁基咪唑鎓溴化物)(通过RAFT聚合方法合成了不同聚(离子液体)刷长的PMEBIm-Br,并用于制备聚偏二氟乙烯共混膜。化学分析证实,具有不同链长的PMEBIm-Br嵌段的P(MMA-b-MEBIm-Br)成功共聚,并且在共混膜表面还检测到PIL基团,这有助于亲水性和带正电荷膜表面。这些性能通过共聚物中PMEBIm-Br嵌段的链长进一步增强。可以通过阴离子交换将膜的表面润湿性从亲水性调节为疏水性,并且水通量的变化也证实了这些现象。此外,使用橙色G和罗丹明6G这两种染料研究了PMEBIm-Br嵌段对膜分离性能的影响。结果表明,具有较长长度PMEBIm-Br嵌段的共混膜对罗丹明6G具有较高的排斥性和良好的防污性能。此外,共混膜对两种染料的吸附实验还表明,具有较长PMEBIm-Br嵌段的共混膜具有良好的染料吸附分离性能。用橙色G和若丹明6G两种染料研究了PMEBIM-Br嵌段对膜分离性能的影响。结果表明,长的PMEBIm-Br嵌段共混膜对罗丹明6G的排斥力高,防污性能好。此外,共混膜对两种染料的吸附实验还表明,具有较长PMEBIm-Br嵌段的共混膜具有良好的染料吸附分离性能。用橙色G和若丹明6G两种染料研究了PMEBIM-Br嵌段对膜分离性能的影响。结果表明,具有较长长度PMEBIm-Br嵌段的共混膜对罗丹明6G具有较高的排斥性和良好的防污性能。此外,共混膜对两种染料的吸附实验还表明,具有较长PMEBIm-Br嵌段的共混膜具有良好的染料吸附分离性能。

更新日期:2020-03-03
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