| 摘要 |
The present invention discloses a method to prepare the polymer-clay nanocomposite latex. At first, a clay and a water-soluble initiator are mixed in water to form an intermediate solution, in which the initiator is absorbed or intercalated into the clay. Then, at least one monomer from vinyl ester, acrylic and acrylamide derivatives is added into the intermediate solution for soap-free emulsion polymerization, which may also be added with some other monomers such as acrylic acid, maleic anhydride, vinyl chloride, acrylonitrile ethylene, et al. for copolymerization. During soap-free emulsion polymerization, the radicals from the dissociated initiators will react with the monomers to form the monomer radicals, which tend to diffuse into the interlayer region of clays for further polymerization and eventually exfoliate the clays. The prepared exfoliated polymer-clay nanocomposite latex can be cast into a vapor-impermeable film so that it can be used as a sealing material or coating. The exfoliated clay in nanoplatelet form is a two-dimensional electrolyte nanomaterial and its aqueous solution is conductive. The exfoliated clay aqueous solutions can be prepared by removing the polymer matrix from the nanocomposite latex with solvent. As the exfoliated clay solution is cast into a film with the clay content is more than or equal to 80 wt %, the film is semi-conductive. Thus, the exfoliated clay aqueous solutions can be applied to the electronic materials and organic/inorganic multilayer composite films.
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