Abstract: A display assembly including a stand, a mounting assembly and a display. The mounting assembly includes a fixed base, a first pivot, a pivotable base, a second pivot, a handle, a plurality of first engagement structures and a second engagement structure. The handle includes a handheld part and a mounting part. The mounting part is connected to the handheld part and pivotally connected to the pivotable base via the second pivot. The first engagement structures are disposed at one of the fixed base and the mounting part of the handle. The second engagement structure is disposed at another one of the fixed base and the mounting part of the handle. The display is fixed on the pivotable base. The first pivot is not coaxial with the second pivot so that the second engagement structure is configured to be engaged with any one of the first engagement structures.

Abstract: 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.