Preparation of polystyrene/toluene-2,4-di-isocyanate-modified montmorillonite hybrid

A novel selective interlamellar modification of cetyltrimethylammonium brom ide-exchanged montmorillonite (MMT) by toluene-2,4-di-isocyanate (TDI) has been successfully obtained, and a polystyrene/TDI-modified MMT hybrid has b een prepared. After the interlamellar modification, TDI was grafted to hydr oxyl, groups of the MMT, and the orientation of cetyltrimethylammonium in t he interlayer space changed from a bilayer lying flat structure to a double -layer inclined one. The structures of the TDI-modified MMT and the hybrid were characterized by Fourier transform infrared (FTIR) spectra, powder X-r ay diffraction (XRD), and transmission electron microscopy (TEM) techniques . A schematic model of the TDI-modified MMT structure was also presented. ( C) 2000 John Wiley & Sons, Inc.