The modified polyacrylamide (HAPC) based on a benzene ring and an ethoxy chain that can bind metal ions was successfully prepared by micellar polymerization. The structure of HAPC was characterized by Fourier infrared spectroscopy and hydrogen nuclear magnetic spectroscopy. Some properties of the polymer were evaluated, and the temperature resistance, salt resistance, rheological properties, aging resistance and oil displacement physical simulation experiments of HAPC were studied. The experimental results show that the introduction of benzene ring and ethoxy chain greatly improved the salt resistance of the polymer. Among them, the maximum viscosity can be increased by about 5 times in the calcium chloride and magnesium chloride divalent ion solution. When the concentration was 12000 mg/L and the concentration of magnesium chloride was 16000 mg/L, the viscosity retention rate was 63.5% and 90% respectively; The physical simulation experiment of oil displacement shows that HAPC can increase the oil recovery rate by 19.85% at 80 °C and high salt concentration (1.0 × 10 5 mg/L simulated brine).
This work presents the investigation of two aliphatic polycarbonate diols (CAPC and HAPC) as the stationary phases for capillary gas chromatography (GC). The CAPC and HAPC capillary columns showed moderate polarity and high column efficiency of 3704 – 4545 plates/m measured by n-octanol and naphthalene at 120 °C. It was found that despite their similar chemical compositions, CAPC and HAPC differ largely in their selectivity towards the isomers of alkanes, methylpyridines and xylenes. As demonstrated, the CAPC column exhibits advantageous comprehensive performance over the HAPC column and the commercial PEG column. Particularly, the CAPC column exhibits higher resolving performance towards the isomers indicated above and the Grob mixture than the HAPC column. Also, it shows distinct advantages over the PEG column in separating the Grob mixture, the isomers of diethylbenzenes and cymenes, and practical analysis of chemical products and the essential oil from the leaves of Rhododendron dauricum L. Additionally, the CAPC column has excellent repeatability and reproducibility on analyte retention times with the relative standard deviation (RSD) values in the range of 0.05% – 0.08% for run-to-run, 0.12% – 0.19% for day-to-day and 2.6% – 4.9% for column-to-column, respectively. Its applications to purity test of chemical products and GC–MS analysis of the essential oil demonstrate its promising future for practical GC analyses.
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