Preparation and characterization of a novel strong‐base anion exchange fiber

Abstract

A novel strong-base anion exchange fiber (QAPAN) was prepared in this study by preamination of a commercial poly(acrylonitrile) fiber followed by its subsequent grafting of glycidyl trimethylammonium chloride (GTA). The grafting conditions were optimized by conducting a L 18 (3 7 ) orthogonal test; and properties of the prepared QAPAN were investigated by multiple analyses. Results showed that the optimal reaction conditions were GTA dosage 4 mL, temperature 60 C, reaction time 6 h, and volume ratio of water to dimethyl sulfoxide (DMSO) 0.5 : 0.5, among which volume ratio of water to DMSO was deemed as the most important factor on the QAPAN preparation. The prepared QAPAN had excellent fibrous morphology and fine mechanical stability, making its further processing feasible. Acid-base titration tests showed that the QAPAN had a total exchange capacity (TEC) of 6.34 mmol/g and a strong base capacity (SBC) of 1.34 mmol/g. Analyses of Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy further verified that the quaternary ammonium group was successfully grafted onto the QAPAN. This study provided a novel strong-base anion exchange fiber as well as a simple and repeatable method for its preparation. V C 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 128: 934-940, 2013

Adsorption of Aqueous Cr(VI) by Novel Fibrous Adsorbent with Amino and Quaternary Ammonium Groups

“…The modification processes yielded a stable fibrous adsorbent in orange color (Figure B). As shown in our previous study, FTIR spectra of the QAPAN as compared with the original PAN and the prepared APAN showed that after amination of the PAN with triethylenetetramine, the peak at 2243 cm –1 (CN stretching in the nitrile group) was significantly reduced. Simultaneously, two new bands appeared at 1645 (CO in amide) and 1602 cm –1 (N–H group in amine), indicating that amino groups were successfully grafted onto the PAN fibers, probably through the reaction between triethylenetetramine and the nitrile group.…”

A Universal Polyiodide Regulation Using Quaternization Engineering toward High Value‐Added and Ultra‐Stable Zinc‐Iodine Batteries

“…Two newly emerging peaks at 990 and 947 cm −1 are the characteristic peaks of the quaternary ammonium groups from quaternization between the GC‐PAN and methyl iodide. [ 28 ] As shown by the XPS spectrum of N 1s for the GC‐PAN/I in Figure 1c , it can be divided into three peaks at 399.0, 400.0, and 402.4 eV, which correspond to secondary amine‐type nitrogen (N S‐amine ), amide‐type nitrogen (N amine ), and quaternary ammonium‐type nitrogen (N Q‐ammonium ), respectively. [ 29 ] However, a new tertiary amine‐type nitrogen appears at 401.7 eV for the GC‐PAN (Figure S6 , Supporting Information), and is further replaced by the quaternary ammonium‐type nitrogen in GC‐PAN/I, which demonstrates the successful conversion of tertiary amine into quaternary ammonium through quaternization.…”