Title

LAYERED MATERIALS AS COLOURED FILLERS FOR POLYMERIC MULTIFUNCTIONAL MATERIALS

LAYERED MATERIALS AS COLOURED FILLERS FOR POLYMERIC MULTIFUNCTIONAL MATERIALS

Authorship

Marangoni, Rafael; Mikowski, Alexandre; Wypych, Fernando

Marangoni, Rafael

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Mikowski, Alexandre

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Wypych, Fernando

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DOI

10.5151/2594-5327-32956

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Abstract

Zn2Al layered double hydroxides (LDHs) were intercalated with anionic dyes, namely, Orange G (OG), Orange II (OII), Methyl Orange (MO), by zinc and aluminium nitrates simultaneously precipitated with an alkaline aqueous solution, in the presence of excess anionic dyes. After washing procedure to remove the excess of the dye sodium salts, the intercalation compound were dried and characterized by several instrumental techniques. Homogeneous composite films were obtained by casting, after dispersing the LDH intercalated dyes (pigments) into commercial poly (vinyl alcohol) (PVA) aqueous solution and evaporation of water in a vacuum oven. The obtained composite films were transparent, coloured, and capable of absorbing UV radiation. Improved mechanical and thermal properties were also observed compared to the non-filled PVA films or filled with the sodium dye salts. These results demonstrate the onset of a new range of potential applications for LDHs in the preparation of polymer nanocomposite multifunctional materials.

Zn2Al layered double hydroxides (LDHs) were intercalated with anionic dyes, namely, Orange G (OG), Orange II (OII), Methyl Orange (MO), by zinc and aluminium nitrates simultaneously precipitated with an alkaline aqueous solution, in the presence of excess anionic dyes. After washing procedure to remove the excess of the dye sodium salts, the intercalation compound were dried and characterized by several instrumental techniques. Homogeneous composite films were obtained by casting, after dispersing the LDH intercalated dyes (pigments) into commercial poly (vinyl alcohol) (PVA) aqueous solution and evaporation of water in a vacuum oven. The obtained composite films were transparent, coloured, and capable of absorbing UV radiation. Improved mechanical and thermal properties were also observed compared to the non-filled PVA films or filled with the sodium dye salts. These results demonstrate the onset of a new range of potential applications for LDHs in the preparation of polymer nanocomposite multifunctional materials.

Keywords

layered double hydroxides, Nanocomposites, PVA

layered double hydroxides, Nanocomposites, PVA