Montmorillonite (MMT) clay platelets were successfully encapsulated in poly(methyl methacrylate-co-ethyl acrylate) [poly(MMA-co-EA)] matrix by an in situ suspension polymerization, and evaluated for their plugging behaviors in single-sand pack tube models. Swelling behaviors of the poly(MMA-co-EA)/MMT nanocomposites in various salinity water were also investigated. Results showed that the poly(MMA-co-EA)/MMT nanocomposites had a spherical morphology and their particle sizes mainly range from 10 to 120 µm by scanning electron microscopy (SEM) analysis. X-ray diffraction indicated that the existing of MMT layers in the polymer matrix was mainly in exfoliated form; this was consistent with transmission electron microscopy analysis. The thermal stability of poly(MMA-co-EA)/MMT nanocomposites were effectively improved after adding the MMT by thermogravimetric analysis. Furthermore, the selected nanocomposites containing MMT (1.0 wt%) provided an effective plugging in sand pack tubes of high permeability, and plugging rate was up to approximately 85.0%.
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