Articles
  • Stability of hybrid organosilica materials incorporating a biphenyl moiety 
  • Eduardo R. Magdaluyo, Jr.a,*, Raymond V. Rivera Virtudazob, Leonard P. dela Cruzc, Emily V. Castricionesc,d and Herman D. Mendozaa
  • a Department of Mining, Metallurgical and Materials Engineering, University of the Philippines, 1101 Diliman, Quezon City, Philippines b Department of Ceramic Engineering, Mariano Marcos State University, Batac, Ilocos Norte, Philippines c Natural Sciences Research Institute, University of the Philippines, 1101 Diliman, Quezon City, Philippines d Inorganic Synthesis and Computational Research Laboratory, Institute of Chemistry, University of the Philippines, 1101 Diliman, Quezon City, philippines
Abstract
Quezon City PhilippinesThe stability of biphenyl-functionalized ethane-silica hybrid materials was investigated by a calcination process, a hydrothermal test and exposure to UV to determine the integrity of Its composition, structure, and morphology. The organosilicas were prepared via surfactant-mediated polymerization of 4,4'-bis(triethoxysilyl)biphenyl organosilane monomer and crosslinked with 1,2-bis(triethoxysilyl)ethane and tetraethoxysilane. Infrared spectroscopic and gravimetric analyses showed that the material was thermally stable below 700 degrees C. Its hydrothermal stability could he accounted for by the strong covalent integration of the bifunctional organic bridging groups in the silica framework. No significant change was observed in the functional groups when the material was exposed to ultra-violet radiation. Post heat treatment of the materials did not significantly change the interplanar spacing of the (100) plane, but enhanced the spherical particle morphology.

Keywords: organosilica; Surfactant-mediated polymerization; Biphenyl moiety

This Article

  • 2010; 11(1): 15-19

    Published on Feb 28, 2010