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首页> 外文期刊>ACS Omega >Stabilization of Polymer Nanocomposites in High-Temperature and High-Salinity Brines
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Stabilization of Polymer Nanocomposites in High-Temperature and High-Salinity Brines

机译：高温和高盐度盐水中聚合物纳米复合材料的稳定性

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Stabilization of polymer nanocomposites in aqueous environment with high salinity has been a constant challenge for their applications. This work aimed to improve the stability of graphene oxide (GO) polyacrylamide nanocomposites at high-temperature and high-ionic-strength brines. GO was synthesized via a modified Hummers’ method and the copolymer of acrylamide (COPAM) was obtained via free-radical polymerization. The covalent functionalization of COPAM with the partially reduced GO (rGO) was successfully achieved. 1,3-Propane sultone was used to further functionalize the obtained rGO–COPAM composites to accomplish the zwitterionic character on the rGO–COPAM surface to get a material with excellent temperature stability and dispersibility in the presence of high ionic strength brines. The synthesized materials were characterized by 1H NMR, gel permeation chromatography, X-ray photoelectron spectroscopy, scanning electron microscopy, transmission electron microscopy analysis, and so forth. The thermal stability of the dispersion at 80 °C for 120 days was observed by visual inspection and spectroscopic analysis. The results showed that the zwitterionic polymer produced excellent brine stability with GO nanosheets and suggested promising applications of zwitterionic polyacrylamide–GO systems especially for enhanced oil recovery.
机译：在高盐度的水性环境中稳定聚合物纳米复合材料一直是其应用面临的挑战。这项工作旨在提高高温和高离子强度盐水中氧化石墨烯（GO）聚丙烯酰胺纳米复合材料的稳定性。 GO是通过改良的Hummers方法合成的，而自由基聚合的则是丙烯酰胺的共聚物（COPAM）。通过部分还原的GO（rGO）成功实现了COPAM的共价官能化。 1,3-丙磺酸内酯用于进一步功能化所获得的rGO-COPAM复合材料，以在rGO-COPAM表面上实现两性离子特性，从而在高离子强度盐水的存在下获得具有出色的温度稳定性和分散性的材料。合成的材料通过1 H NMR，凝胶渗透色谱，X射线光电子能谱，扫描电子显微镜，透射电子显微镜分析等进行表征。通过目测和光谱分析观察分散体在80℃下120天的热稳定性。结果表明，两性离子聚合物在GO纳米片中具有出色的盐水稳定性，并表明两性离子聚丙烯酰胺– GO系统的应用前景广阔，尤其是在提高采油率方面。

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