Advertisement

Colloid and Polymer Science

, Volume 272, Issue 12, pp 1602–1610 | Cite as

The kinetics of silylation of hydroxylated silica 1: Aerosil

  • M. S. Nadiye-Tabbiruka
  • J. M. Haynes
Original Contributions

Abstract

The kinetics of the silylation of hydroxylated silica, the non-porous Aerosil using trimethylchlorosilane, under various reaction conditions has been investigated by a gravimetric technique and found to follow the law:
$$\left[ {\frac{{1 + b}}{t}} \right]\ln \left\{ {\frac{{M_\infty }}{{M_\infty - M_t }}} \right\} - \frac{{M_t b}}{{M_\infty t}} = k_{\text{a}} $$
which represents a first order reaction retarded by one of its products. From this analysis, the activation energy in the temperature range 598 K to 673 K, was found to be 155 kJ mol−1. The reaction is independent of pressure at values greater than 15 torr.

Key words

Aerosil silylation kinetics trimethylchlorosilane 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    Hertl W (1967) J Phys Chem 72:1248Google Scholar
  2. 2.
    Tertykh VA, Chuiko AA, Mashchenko VM, Pavlov VV (1973) Russ J Phys Chem 47:85Google Scholar
  3. 3.
    Hertl W, Hair NL (1969) J Phys Chem 75:2181Google Scholar
  4. 4.
    Snyder LR, Ward JW (1969) J Phys Chem 70:3941Google Scholar
  5. 5.
    Hair ML, Hertl W (1968) J Phys Chem 73:2373Google Scholar
  6. 6.
    van Velzen PNT, Ponjee JJ, Benninghoven A (1989) Applied Surf Sci 37:147Google Scholar
  7. 7.
    Evans B, White TE (1968) J Catalysis 11:336Google Scholar
  8. 8.
    Armistead CG, Hockey JA (1967) Trans Faraday Soc 63:2549Google Scholar
  9. 9.
    Low MJ (1960) Chem Rev 60:267Google Scholar
  10. 10.
    Galuszka J (1979) J Chem Soc Faraday Trans 1 75(5):1016Google Scholar
  11. 11.
    Ritche AG (1977) J Chem Soc Faraday Trans 1 73:1650Google Scholar
  12. 12.
    Kisiliuk P (1958) J Phys Chem Solids 5:78Google Scholar
  13. 13.
    Unger KK (1979) In. Porous Silica, its properties and use as support in column liquid chromatography Elsevier, AmsterdamGoogle Scholar
  14. 14.
    Somer LH (1966) In: Stereochemistry, Mechanism and Silicon — An introduction to the dynamic stereochemistry of silicon centresGoogle Scholar
  15. 15.
    Buzek F, Rathousky J (1981) J Colloid Interface Sci 79:47Google Scholar
  16. 16.
    Caldin EF, Mateo S (1976) J Chem Soc Faraday Transl, 72:112Google Scholar
  17. 17.
    Hair ML, Tripp CP (1991) Langmuir 7:923Google Scholar
  18. 18.
    Nadiye-Tabbiruka MS, Ph.D. thesis University of Bristol (1991)Google Scholar
  19. 19.
    Chemical Kinetics ch 6 (book) Laidler KJ, ed. Mcgraw-Hill Company NYGoogle Scholar
  20. 20.
    Elovich S Yu, Zhabrova GM (1939) Zh Fiz Khim, 13:1761Google Scholar

Copyright information

© Steinkopff-Verlag 1994

Authors and Affiliations

  • M. S. Nadiye-Tabbiruka
    • 1
  • J. M. Haynes
    • 1
  1. 1.School of ChemistryUniversity of BristolBristolUK

Personalised recommendations