Zhang Zhirong, Sun Linghui, Chen Feiyu, Liu Xiangui, Huo Xu, Pan Xiuxiu, Feng Chun
Chinese Academy of Sciences University, Beijing 101408, China; State Key Laboratory of Enhanced Oil Recovery, China Petroleum Exploration and Development Research Institute, Beijing 100083, China.
Chinese Academy of Sciences University, Beijing 101408, China; State Key Laboratory of Enhanced Oil Recovery, China Petroleum Exploration and Development Research Institute, Beijing 100083, China.
Carbohydr Polym. 2024 Dec 1;345:122598. doi: 10.1016/j.carbpol.2024.122598. Epub 2024 Aug 8.
The low cost and environmental advantages of Xanthan gum make its production and application scale exceed that of other polysaccharides. However, the temperature resistance of Xanthan gum limits its application. In this study, polysaccharide supramolecular Xanthan gum network (XG-β-CD/AD) based on β-cyclodextrin and adamantane was prepared for enhanced oil recovery. The structure of Xanthan gum was characterized by Fourier infrared spectroscopy, nuclear magnetic resonance spectroscopy and thermogravimetric analysis. The rheological properties of the modified polysaccharide network in aqueous solution were systematically studied. The results showed that physical cross-linking of host-guest interacion enhanced the thickening ability of the polymer. Shear rheology, extensional rheology and dynamic modulus test proved that XG-β-CD/AD had excellent rheological properties. The micromorphology, dynamic light scattering and circular dichroism clarified the molecular conformation, the host-guest interaction can improve conformational transition temperature (Tm) and inorganic salt tolerance of Xanthan gum. Under harsh environment (90 °C, 30000 mg/L brine), the oil recovery of XG-β-CD/AD is 6 %-11 % higher than that of XG at the same conditions, showing a better ability to improve the recovery rate. This study provides a research idea for the selection, development and application of biomacromolecular materials.
黄原胶的低成本和环境优势使其生产和应用规模超过了其他多糖。然而，黄原胶的耐热性限制了其应用。在本研究中，制备了基于β-环糊精和金刚烷的多糖超分子黄原胶网络（XG-β-CD/AD）用于提高采收率。通过傅里叶红外光谱、核磁共振光谱和热重分析对黄原胶的结构进行了表征。系统研究了改性多糖网络在水溶液中的流变性能。结果表明，主客体相互作用的物理交联增强了聚合物的增稠能力。剪切流变、拉伸流变和动态模量测试证明XG-β-CD/AD具有优异的流变性能。微观形态、动态光散射和圆二色性阐明了分子构象，主客体相互作用可提高黄原胶的构象转变温度（Tm）和耐无机盐性。在苛刻环境（90℃，30000mg/L盐水）下，XG-β-CD/AD在相同条件下的采收率比XG高6%-11%，显示出更好的提高采收率能力。本研究为生物大分子材料的选择、开发和应用提供了研究思路。
