Applied Polymer Composites
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Title: SYNTHESIS AND CHARACTERIZATION OF POLYURETHANE-LAYERED SILICATE NANOCOMPOSITES USING TRIS(2-HYDROXYETHYL)AMMONIUM IONS ATTACHED MONTMORILLONITE
Page Range: p.155-166
Author(s): Mukesh Kumar; Govind Gupta; Subramani Sankaraiah; Tharanikkarasu Kannan
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Journal: Applied Polymer Composites
Issue Year: apc
Issue No: No.3
Polyurethane-montmorillonite nanocomposites were successfully synthesised using novel tris(2-hydroxyethyl)ammonium ions attached montmorillonite. To enhance the interfacial interactions between the polyurethane and montmorillonite, first, sodium ions present in sodium montmorillonite layers were exchanged with tris(2-hydroxyethyl)ammonium ions and resulting modified montmorillonite was used during the synthesis of polyurethane. As tris(2-hydroxyethyl)ammonium ions are bigger than the sodium ions, during the modification, the distance between montmorillonite layers increased from 1.1 nm to 1.73 nm. X-ray diffraction and transmission electron microscopy results confirm the formation of exfoliated and intercalated polyurethane-montmorillonite nanocomposites. When compared to virgin polyurethane, polyurethane-montmorillonite nanocomposites show higher thermal stability and glass transition temperature. 35 Refs.