| 초록 |
Amidoxime-urea bridged periodic mesoporous amidoximesilicas (PMAs) have been successfully synthesized through co-condensation of bissilylated diaminomaleonitrile (BSDAMN) and tetraethylorthosilicate (TEOS), using a triblock copolymer (Pluronic P123) as a structure directing agent in acidic conditions with various BSDAMN to TEOS ratios. The diaminomaleonitrile siloxane precursor has been characterized by 1H, 13C liquid NMR spectroscopic techniques. The ligand functionality was incorporated into the material as a bridge-bonded group, and the nitrile group of the ligand further converted into amidoxime by chemical modification with hydroxylamine hydrochloride. Silica materials were characterized by powder X-ray diffraction (XRD), transmission electron microscopy (TEM), FT-IR spectroscopy, N2-sorption isotherm, 29Si and 13C CP MAS NMR spectroscopic analyses, and thermogravimetric analysis (TGA). The morphologies of the materials were identified by scanning electron microscopic analysis. |
