Tae Hoon Lee, Jun Hyeok Kang, Min Gyu Shin, Jung-Hyun Lee, Hyo Won Kim, Ho Bum Park
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High-flux polyamide thin-film composite membranes consisting of Tröger’s base motif with enhanced microporosity for nanofiltration
High-flux and selective membranes are key components to improving the energy efficiency of nanofiltration processes for water purification. Herein, we report high-flux polyamide thin-film composite (TFC) membranes consisting of Tröger’s base for nanofiltration. Tröger’s base diamine (TBD) was synthesized as an aqueous phase monomer for interfacial polymerization. Detailed characterization of TBD-based polyamides was performed using thermal, spectroscopic, and microscopic analyses. Notably, the V-shaped and rigid Tröger’s base motif rendered TBD-based polyamide (named TBD-TMC) features with enhanced microporosity as well as an enlarged pore size compared to conventional polyamide chemistry (i.e., MPD-TMC). As a result, the TBD-TMC membrane exhibited a 570% improvement in water permeance compared to MPD-TMC membranes while exhibiting moderate salt rejection up to 91%, outperforming most reported nanofiltration membranes. Also, the TBD-TMC membrane exhibited high monovalent/divalent ion selectivity (∼7.0 for NaCl/Na2SO4 separation), which may have resulted from the combined effects of size exclusion and charge repulsion. This work highlights the potential of Tröger’s base motif as a new diamine monomer for interfacially polymerized membranes to tune their microporous structures.
期刊介绍:
Polymer is an interdisciplinary journal dedicated to publishing innovative and significant advances in Polymer Physics, Chemistry and Technology. We welcome submissions on polymer hybrids, nanocomposites, characterisation and self-assembly. Polymer also publishes work on the technological application of polymers in energy and optoelectronics.
The main scope is covered but not limited to the following core areas:
Polymer Materials
Nanocomposites and hybrid nanomaterials
Polymer blends, films, fibres, networks and porous materials
Physical Characterization
Characterisation, modelling and simulation* of molecular and materials properties in bulk, solution, and thin films
Polymer Engineering
Advanced multiscale processing methods
Polymer Synthesis, Modification and Self-assembly
Including designer polymer architectures, mechanisms and kinetics, and supramolecular polymerization
Technological Applications
Polymers for energy generation and storage
Polymer membranes for separation technology
Polymers for opto- and microelectronics.