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In the paper, an exfoliated nano-composite was prepared by vinyl acetate (VAc), montmorillonite (MMT) and dioctadecyl dimethyl ammonium bromide (DOAB).Then it was mainly studied by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM) and static tension. Its rheology was also investigated by the power-law function equation and the Cross-Williamson model viscous equation. Results showed that the exfoliated nano-composite was obtained. Linear macromolecular chains of polyvinyl acetate (PVAc) were formed in the layers of MMT-DOAB. MMT-DOAB was exfoliated into layers or sheets of nano-particles, and randomly dispersed in the matrix of PVAc. The particle diameter of MMT-DOAB was from 25 nm to 75 nm, while PVAc’s was from 250 nm to 500 nm. They randomly dispersed together. The smaller MMT-DOAB particles were adsorbed around the bigger PVAc particles; they formed the “Strawberry” structure. In addition, PVAc and PVAc- MMT-DOAB were pseudo-plastic Non-Newtonian fluids, they all possessed the normal stress effect (or Weissenberg effect), that was the pole-climbing phenomenon. The reasonable addition of MMT-DOAB in polymerization was better but not more than 2.0 wt% of VAc.

Preparation and characterization of exfoliated nanocomposite prepared by vinyl acetate, montmorillonite and dioctadecyl dimethyl ammonium bromide