Surface Migration of Fluorinated-Siloxane Copolymer with Unusual Liquid Crystal Behavior for Highly Efficient Oil/Water Separation,ACS Applied Energy Materials

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Surface Migration of Fluorinated-Siloxane Copolymer with Unusual Liquid Crystal Behavior for Highly Efficient Oil/Water Separation
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2020-07-13 00:00:00 , DOI: 10.1021/acsapm.0c00615
Yuqin Jiang ₁ , Lu Jiang ₂ , Yuanyuan Pang ₃ , Dan Kai ₂ , Xiaoshan Fan _{1,

4} , Zibiao Li ₂

Affiliation

Eco-friendly superhydrophobic polycaprolactone (PCL) membranes with hierarchical structure for efficient oil/water separation were fabricated via a simple and practical route. First, a series of highly fluorinated ABA triblock copolymers, poly(perfluorodecyl methacrylate)-block-poly(dimethylsiloxane)-block-poly(perfluorodecyl methacrylate) (PFMA–PDMS–PFMA), were first synthesized via the dual-head macroinitiator CTA–PDMS–CTA initiated reversible addition–fragmentation chain transfer (RAFT) polymerization of perfluorodecyl methacrylate (PFMA). Interestingly, the central amorphous PDMS block flanked by two long fluorinated PFMA crystallinity chains renders the triblock copolymer a liquid crystal feature with a typical characteristic d-spacing of 3.14–3.08 nm. When the PFMA–PDMS–PFMA copolymer was mixed with biodegradable PCL to form a hybrid nanofibrous membrane via electrospinning, the low surface energy tended to segregate the copolymer and migrated onto the surface of the hybrid nanofibrous membrane, providing a desirable superhydrophobic surface chemistry for high efficient oil/water separation. The soft PDMS chains also provide strong anchoring sites via its interaction with PCL and further stabilize the PFMA surface layer for a prolonged service time. Together with the excellent mechanical properties, the developed PFMA–PDMS–PFMA/PCL hybrid nanofibrous membrane demonstrates high potential as an environmentally friendly substitute for separating oil/water mixtures.

中文翻译：

氟-硅氧烷化合物具有异常液晶行为的表面迁移，可实现高效的油/水分离

通过简单实用的方法，制备了具有分层结构的环保型超疏水聚己内酯（PCL）膜，可有效分离油/水。首先，一系列高度氟化的ABA三嵌段共聚物的聚（全氟癸酯） -嵌段-聚（二甲基硅氧烷） -嵌段-聚（全氟癸基甲基丙烯酸酯）（PFMA-PDMS-PFMA），分别经由双头大分子引发剂CTA-第一合成PDMS–CTA引发了甲基丙烯酸全氟癸基酯（PFMA）的可逆加成-断裂链转移（RAFT）聚合。有趣的是，中心无定形的PDMS嵌段侧接两个长的PFMA长结晶度链，使三嵌段共聚物成为具有典型特征d的液晶特征。-间隔3.14–3.08 nm。当PFMA-PDMS-PFMA共聚物与可生物降解的PCL混合，通过静电纺丝形成杂化纳米纤维膜时，低表面能趋于使共聚物分离并迁移到杂化纳米纤维膜的表面，从而提供了理想的超疏水性表面化学高效的油/水分离。柔软的PDMS链还通过与PCL的相互作用提供了牢固的锚固位点，并进一步稳定了PFMA表面层，从而延长了使用寿命。结合出色的机械性能，开发的PFMA–PDMS–PFMA / PCL杂化纳米纤维膜具有巨大的潜力，可作为分离油/水混合物的环保替代品。

更新日期：2020-07-13

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