Design and characterization of amino and chloro functionalized rhombohedral silsesquioxanes


Gultek A. , Seckin T. , Adiguzel H.

TURKISH JOURNAL OF CHEMISTRY, cilt.29, ss.391-399, 2005 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 29 Konu: 4
  • Basım Tarihi: 2005
  • Dergi Adı: TURKISH JOURNAL OF CHEMISTRY
  • Sayfa Sayıları: ss.391-399

Özet

A more rapid and a versatile synthetic approach for the preparation of polyhedral silsesquioxanes (POSS) by hydrolytic condensation of organosilicon monomers in the presence of a Pt catalyst was studied. The structural properties of POSS molecules were determined by X-ray powder diffraction analysis, yielding a rhombohedral unit cell with a = 11,52796 angstrom and alpha = 94,9754 angstrom for octaaminopropyl-POSS, and a rhombohedral unit cell with a = 11,51421 angstrom, alpha = 96,7214 degrees for octachloropropyl-POSS. The activation energies were found to be 64.8, and 89.1 kJ/mol for octaaminopropyl-POSS and octachloropropyl-POSS, respectively. The products were also characterized by Fourier transform infrared spectroscopy, H-1 and C-13 nuclear magnetic resonance, differential thermal analysis, and thermogravimetric analysis.