Next Article in Journal
A Novel Cellulose-Based Polymer for Efficient Removal of Methylene Blue
Previous Article in Journal / Special Issue
Gas Permeation Property of Silicon Carbide Membranes Synthesized by Counter-Diffusion Chemical Vapor Deposition
Open AccessArticle

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

by Xi Yang
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
Show Figures

Figure 1

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.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop