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Monitoring the Interfacial Polymerization of Piperazine and Trimesoyl Chloride with Hydrophilic Interlayer or Macromolecular Additive by In Situ FT-IR Spectroscopy

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Department of Polymer Science & Engineering, Zhejiang University, Hangzhou 310027, China
Membranes 2020, 10(1), 12; https://doi.org/10.3390/membranes10010012
Received: 31 October 2019 / Revised: 26 December 2019 / Accepted: 6 January 2020 / Published: 7 January 2020
The interfacial polymerization (IP) of piperazine (PIP) and trimesoyl chloride (TMC) has been extensively utilized to synthesize nanofiltration (NF) membranes. However, it is still a huge challenge to monitor the IP reaction, because of the fast reaction rate and the formed ultra-thin film. Herein, two effective strategies were applied to reduce the IP reaction rate: (1) the introduction of hydrophilic interlayers between the porous substrate and the formed polyamide layer, and (2) the addition of macromolecular additives in the aqueous solution of PIP. As a result, in situ Fourier transform infrared (FT-IR) spectroscopy was firstly used to monitor the IP reaction of PIP/TMC with hydrophilic interlayers or macromolecular additives in the aqueous solution of PIP. Moreover, the formed polyamide layer growth on the substrate was studied in a real-time manner. The in situ FT-IR experimental results confirmed that the IP reaction rates were effectively suppressed and that the formed polyamide thickness was reduced from 138 ± 24 nm to 46 ± 2 nm according to TEM observation. Furthermore, an optimized NF membrane with excellent performance was consequently obtained, which included boosted water permeation of about 141–238 (L/m2·h·MPa) and superior salt rejection of Na2SO4 > 98.4%. View Full-Text
Keywords: interfacial polymerization; in situ FT-IR spectroscopy; thin-film composite membrane; nanofiltration membrane interfacial polymerization; in situ FT-IR spectroscopy; thin-film composite membrane; nanofiltration membrane
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MDPI and ACS Style

Yang, X. Monitoring the Interfacial Polymerization of Piperazine and Trimesoyl Chloride with Hydrophilic Interlayer or Macromolecular Additive by In Situ FT-IR Spectroscopy. Membranes 2020, 10, 12. https://doi.org/10.3390/membranes10010012

AMA Style

Yang X. Monitoring the Interfacial Polymerization of Piperazine and Trimesoyl Chloride with Hydrophilic Interlayer or Macromolecular Additive by In Situ FT-IR Spectroscopy. Membranes. 2020; 10(1):12. https://doi.org/10.3390/membranes10010012

Chicago/Turabian Style

Yang, Xi. 2020. "Monitoring the Interfacial Polymerization of Piperazine and Trimesoyl Chloride with Hydrophilic Interlayer or Macromolecular Additive by In Situ FT-IR Spectroscopy" Membranes 10, no. 1: 12. https://doi.org/10.3390/membranes10010012

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