The effect of covalently modification of montmorillonite by 3-glycidoxy propyl trimethoxysilane on its dispersibility in TPU/MMT nanocomposite
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1Research Institute of Composite, Malek Ashtar University of Technology, Tehran, Iran
2Composite Research Institute, Department of Materials and Manufacturing Technologies, Malek Ashtar University of Technology, Tehran, Iran
3Polymer Engineering Group, Composite Research Institute, Malek Ashtar University of Technology, Tehran, Iran
In this work, the silylation of sodium montmorillonite (Na+-MMt) was performed using (3-Glycidoxypropyl)trimethoxy silane (GPTMS). Different amount of the silane were used to modify clay surface. Thermoplastic polyurethane (TPU)/clay nanocomposites were produced by incorporation of 3wt % loading organically modified montmorillonite clay (SMMT) in TPU matrix by melt-mixing route.The grafting/intercalation of the GPTMS inside the Na+-Mt interlayer spaces was studied by means of thermogravimetric analysis (TGA) and Fourier transform infrared (FTIR). Thermoplastic polyurethane (TPU)/clay nanocomposites were analyzed by means of Low angle X-ray diffraction (XRD). The results showed that silane grafting improved the nanoclay dispersibility in TPU matrix, possibly due to the improved interaction between the hydrophilic mineral platelets of clay and TPU chains. The best result was found for SMMT2.