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首页> 外文期刊>Polymer Composites >Preparation, Structure, and Properties of Polyvinyl acetate-co-methyl methacrylate) Nanocomposite Microspheres With Exfoliated Montmorillonite Through Using Two-Stage In Situ Suspension Polymerization
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Preparation, Structure, and Properties of Polyvinyl acetate-co-methyl methacrylate) Nanocomposite Microspheres With Exfoliated Montmorillonite Through Using Two-Stage In Situ Suspension Polymerization

机译：两阶段原位悬浮聚合制备带脱落蒙脱土的聚乙酸乙烯酯-甲基丙烯酸甲酯-共聚物（甲基丙烯酸甲酯）纳米复合微球

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摘要

Effective encapsulation of montmorillonite intermediate particles (l-MMT) within poly (vinyl acetate-co-methyl methacrylate) (PVAMMA) copolymer by in situ suspension polymerization was performed. The l-MMT encapsulation, layer exfoliation behavior, chemical composition, particle size distribution and thermostability of PVAMMA/I-MMT nanocomposite microspheres were characterized by electron microscopies, X-ray diffraction (XRD), laser particle analyzer, and thermogravimetric analysis (TGA). Swelling behaviors of the nanocomposite microspheres in various cationic salt solutions (NaCI and CaCI2) and anionic salt solution (NaCI and Na2SO4) were also investigated. Results showed that the properties of layer dispersion surface and expansion of these nanocomposite microspheres were well achieved. The synthetic yields of the nano-composites decreased as the l-MMT loading increased. These nanocomposite microspheres had an average size from 96.8 urn to 138.4 |im with narrow particle size distribution, loose, and porous surface morphology. XRD patterns clearly proved the exfoliation of MMT layers in the copolymer matrix, which was consistent with TEM analysis. These nanocomposite microspheres showed higher negative zeta potential and higher thermal stability than those of the copolymer microspheres, which was due to the layer exfoliations in encapsulated microspheres. These selected microspheres with 10 to 70 im diameters provided effectively plugging in the micrometer-sized core channels through deformation and migration process in plugging experiments, which made them be the candidate materials for modifying the porous reservoir to enhance oil recovery in petroleum engineering.
机译：通过原位悬浮聚合有效地将蒙脱石中间颗粒（1-MMT）封装在聚（乙酸乙烯酯-共-甲基丙烯酸甲酯）（PVAMMA）共聚物中。通过电子显微镜，X射线衍射（XRD），激光颗粒分析仪和热重分析（TGA）对PVAMMA / I-MMT纳米复合微球的l-MMT包封，层剥落行为，化学成分，粒度分布和热稳定性进行了表征。还研究了纳米复合微球在各种阳离子盐溶液（NaCl和CaCl2）和阴离子盐溶液（NaCl和Na2SO4）中的溶胀行为。结果表明，这些纳米复合微球的层分散表面特性和膨胀性均得到了很好的实现。纳米复合材料的合成产率随着1-MMT负载的增加而降低。这些纳米复合微球的平均粒径为96.8微米至138.4微米，具有窄的粒径分布，疏松和多孔的表面形态。 XRD图清楚地证明了共聚物基质中MMT层的剥离，这与TEM分析一致。这些纳米复合微球显示出比共聚物微球更高的负ζ电动势和更高的热稳定性，这归因于封装微球中的层剥离。这些选定的直径为10至70微米的微球可通过堵塞实验中的变形和迁移过程有效地堵塞微米级的岩心通道，这使其成为改性多孔油藏以提高石油工程采油率的候选材料。

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