Synthesis and characterization of novel waterborne polyurethane dispersions
Doğan, Nesibe Ayşe (2014) Synthesis and characterization of novel waterborne polyurethane dispersions. [Thesis]
Novel aqueous dispersions of polyurethanes with sodium 2-[(2-aminoethyl)amino]ethanesulphonate as the ionic monomer have been successfully synthesized by acetone method. The effects of ionic content, hard segment content, type of polyol and degree of chain extension on the properties of polyurethane dispersions and their films have been systematically investigated. Furthermore, polyurethane/Halloysite nanocomposites have been prepared and the effects of key reaction parameters such as method of the incorporation of Halloysites into polyurethanes, Halloysite content and ionic content of the polyurethane on the final film properties have been studied. Polyurethane dispersion samples were characterized by particle size analyzer, whereas elastomeric films of synthesized polyurethanes were characterized using differential scanning calorimetry, dynamic mechanical analysis, scanning electron microscopy, transmission electron microscopy and universal tensile testing machine in order to establish structure-property relationships in these novel polyurethane dispersions, their films and nanocomposites that are reported in the scientific literature for the first time.
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