Chapter 119. Adsorption of Polydimethylsiloxane on Hydrophilic and Silylated Fumed Silica. Investigations by Differential Scanning Calorimetry

  1. Prof. Norbert Auner2 and
  2. Prof. Johann Weis3
  1. A. Altenbuchner,
  2. H. Barthel,
  3. T. Perisser,
  4. L. Rösch and
  5. J. Weis

Published Online: 28 APR 2008

DOI: 10.1002/9783527619917.ch119

Organosilicon Chemistry IV: From Molecules to Materials

Organosilicon Chemistry IV: From Molecules to Materials

How to Cite

Altenbuchner, A., Barthel, H., Perisser, T., Rösch, L. and Weis, J. (2000) Adsorption of Polydimethylsiloxane on Hydrophilic and Silylated Fumed Silica. Investigations by Differential Scanning Calorimetry, in Organosilicon Chemistry IV: From Molecules to Materials (eds N. Auner and J. Weis), Wiley-VCH Verlag GmbH, Weinheim, Germany. doi: 10.1002/9783527619917.ch119

Editor Information

  1. 2

    Inst. für Anorganische Chemie, der Universität Frankfurt, Marie-Curie-Strasse 11, D-60439 Frankfurt am Main, Germany, Phone: 0 69/7 98-29180, -29591, Fax: 069/798-29188

  2. 3

    Wacker-Chemie GmbH, Geschäftsbereich S, Werk Burghausen, Johannes-Hess-Strasse 24, D-84489 Burghausen, Germany

Author Information

  1. Wacker-Chemie GmbH, Werk Burghausen D-84480 Burghausen, Germany

Publication History

  1. Published Online: 28 APR 2008
  2. Published Print: 17 JAN 2000

ISBN Information

Print ISBN: 9783527298549

Online ISBN: 9783527619917

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Keywords:

  • fumed silica;
  • polydimethylsiloxane;
  • PDMS;
  • differential scanning calorimetry (DSC);
  • glass transition temperature

Summary

Fumed silica is a synthetic amorphous silicon dioxide produced by burning silicon tetrachloride in an oxygen-hydrogen flame. Surface areas range from 50 m2/g up to 400 m /g. Fumed silica is used as an active filler providing a high performance in reinforcing silicone rubbers. Adsorption interactions of the polydimethylsiloxane (PDMS) chains within the elastomeric network on the filler surface play an important role in the mechanisms of reinforcement. The aim of this paper is to study the impact of surface silylation on the adsorption behavior of PDMS polymers on hydrophilic and silylated surfaces. Differential scanning calorimetry (DSC) was used to monitor the impact of adsorption on the mobility of the PDMS chains. Typical DSC signals, like the glass transition, are observed for only the free polymer, but not for polymer chains adsorbed at the silica surface. The PDMS adsorption capacity of silicas at different degrees of silylation has been determined. On the free silica surface, adsorption results in about four to five layers of immobilised PDMS chain segments.