Synthesis, Characterization and Ceramic Conversion Studies of Borosiloxane Oligomers from Phenyltrialkoxysilanes

  • Deepa Devapal
  • S. Packirisamy
  • K. J. Sreejith
  • P. V. Ravindran
  • Benny K. George


Borosiloxane oligomers, which give ceramic residue in the range of 64–75% (at 900 °C in inert atmosphere), were synthesized through the condensation of boric acid with phenyltrimethoxysilane (PTMOS) and phenyltriethoxysilane in diglyme both in the presence and absence of hydrochloric acid as catalyst. The effect of concentration of the reactants and reaction time on the processability, yield and thermal stability of the product obtained was studied. The oligomers obtained are soluble in common organic solvents and were characterized by FT-IR and NMR spectroscopy, GPC and TGA. The ceramic conversion of one of the oligomers was carried out by heat treatment at 900, 1,500 and 1,650 °C in inert atmosphere. XRD studies reveal that the ceramic formed at 1,500 °C is amorphous and undergoes crystallization to β-SiC when heat treated at 1,650 °C.


Borosiloxane oligomers Precursors for ceramics Silicon–boron-oxycarbide Silicon carbide 29Si-NMR spectra 



The authors thank the authorities of VSSC for granting permission to publish this work. One of the authors (K. J. Sreejith) is thankful to Indian Space Research Organization (ISRO) for the research fellowship. Help received from the members of the Analytical and Spectroscopy Division for the thermal, chemical and spectral analyses and Materials Characterization Division for the XRD analysis of the samples is gratefully acknowledged.


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Copyright information

© Springer Science+Business Media, LLC 2010

Authors and Affiliations

  • Deepa Devapal
    • 1
  • S. Packirisamy
    • 1
  • K. J. Sreejith
    • 1
  • P. V. Ravindran
    • 2
  • Benny K. George
    • 2
  1. 1.Ceramic Matrix Products Division, Propellants and Special Chemicals Group, PCM EntityVikram Sarabhai Space CentreThiruvananthapuramIndia
  2. 2.Analytical and Spectroscopy Division, Propellants and Special Chemicals Group, PCM EntityVikram Sarabhai Space CentreThiruvananthapuramIndia

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