Publikace detail

Viscoelastic Behaviour of Butyl Acrylate/Styrene/2-Hydroxyethyl Methacrylate/Acrylic Acid Latices Thickened with Associative Thickeners

Autoři: Quadrat Otakar | Mikešová Jana | Horský Jiří | Šňupárek Jaromír

Rok: 2003

Druh publikace: článek v odborném periodiku

Název zdroje: Comptes Rendus Chimie

Název nakladatele: Elsevier France

Místo vydání: Paris, France

Strana od-do: 1411-1416

Tituly:

Jazyk	Název	Abstrakt	Klíčová slova
cze	Viscoelastic Behaviour of Butyl Acrylate/Styrene/2-Hydroxyethyl Methacrylate/Acrylic Acid Latices Thickened with Associative Thickeners	The rheological behaviour of butyl acrylate/styrene/crylic acid latices thickened with a hydrophobically modified ethoxylated polyurethane (HEUR) or hydrophobically modified alkali-soluble polyacrylate emulsion (HASE) was investigated. While the pseudoplastic character of frequency dependence of complex viscosity was similar for both thickeners, viscoelastic behavuour, expresed as the ratio of loss and storage moduli, significantly different, indicating that the HEUR molecules, unlike swollen HASE particles, create a viscoelastic space structure. The increase in hydrophilicity of the particle surface, achieved by incorporation of 2-hydroxyethyl methacrylate (HEMA) monomer into the latex copolymer reduced the viscoelasticity of latices thickened with HEUR, but not of those thickened with HASE. This confirms that adsoption of hydrophobic end-groups on particle surface is imposrtant for thickening of latices with HEUR and that a physical network of latex particles interconnected by the thickener macromolecules is formed.	N
eng	Viscoelastic Behaviour of Butyl Acrylate/Styrene/2-Hydroxyethyl Methacrylate/Acrylic Acid Latices Thickened with Associative Thickeners	The rheological behaviour of butyl acrylate/styrene/crylic acid latices thickened with a hydrophobically modified ethoxylated polyurethane (HEUR) or hydrophobically modified alkali-soluble polyacrylate emulsion (HASE) was investigated. While the pseudoplastic character of frequency dependence of complex viscosity was similar for both thickeners, viscoelastic behavuour, expresed as the ratio of loss and storage moduli, significantly different, indicating that the HEUR molecules, unlike swollen HASE particles, create a viscoelastic space structure. The increase in hydrophilicity of the particle surface, achieved by incorporation of 2-hydroxyethyl methacrylate (HEMA) monomer into the latex copolymer reduced the viscoelasticity of latices thickened with HEUR, but not of those thickened with HASE. This confirms that adsoption of hydrophobic end-groups on particle surface is imposrtant for thickening of latices with HEUR and that a physical network of latex particles interconnected by the thickener macromolecules is formed.	dispersions; adsorption; rheology; latex; polymers

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