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Helical polyurethane@attapulgite nanocomposite: Preparation, characterization and study of optical activity
Authors:Zhiqiang Wang  Yuming Zhou  Yanqing Sun  Kai Fan  Xingxing Guo  Xiaolei Jiang
Institution:aSchool of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, PR China
Abstract:Helical polyurethane@attapulgite (BM-ATT) based on R-1,1′-binaphthyl-2′,2-diol (R-BINOL) composite was prepared after the surface modification of attapulgite (ATT). BM-ATT was characterized by Fourier-transform infrared (FT-IR) spectroscopy, X-ray diffraction (XRD), thermogravimetric analysis (TGA), scanning electron microscopy (SEM), transmission electron microscopy (TEM), high resolution transmission electron microscopy (HTEM) and vibrational circular dichroism (VCD) spectroscopy. FT-IR and XRD analyses indicate that the helical polyurethane has been successfully grafted onto the surfaces of the modified ATT without destroying the original crystalline structure of ATT. BM-ATT exhibits the rod-like structure by SEM, TEM, and HTEM photographs. BM-ATT displays obvious Cotton effect for some absorbance in VCD spectrum, and its optical activity results from the singlehanded conformation of helical polyurethane.
Keywords:Polyurethane  Attapulgite  Helical structure  Optical activity  Nanocomposite
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