Rheologica Acta

, Volume 54, Issue 6, pp 517–528 | Cite as

Rheological behaviour of tailored polysilazane melts for the processing of SiCN ceramics: viscoelastic properties and thermal stability

Original Contribution

Abstract

The linear viscoelastic properties of three polysilazanes with different reactive functional groups, such as Si-H, N-H and Si-vinyl groups, were investigated. The evolution of the moduli as a function of temperature was compared to data from thermal gravimetric analysis (TGA) and differential scanning calorimetry (DSC). Special emphasis was given to their thermal stability. The investigated polysilazanes are amorphous polymers with low molecular weight. The storage \( G^{\prime}\left(\omega \right) \) and loss modulus \( G^{{\prime\prime}}\left(\omega \right) \) were measured from 75 to 150 °C (dependent on the particular material), and the time-temperature superposition, following the Williams-Landel-Ferry (WLF) equation, was successfully applied. One cross-linked oligosilazane, ML33S, and the solid polysilazane called ABSE, gave typical results for amorphous low molecular weight polymers. The more reactive cross-linked oligosilazane, HTTS, showed deviating behaviour.

Keywords

Polysilazane Linear viscoelasticity Thermal stability Time-temperature superposition principle Glass transition temperature SiCN ceramics 

Notes

Acknowledgments

The authors gratefully acknowledge the financial support received from Deutsche Forschungsgemeinschaft (DFG) for supporting this work within the project SiMet. We also thank Marietta Böhm from Institute of Macromolecular Chemistry II, University of Bayreuth, for the GPC measurements and Ute Kuhn from the Polymer Engineering Institute, University of Bayreuth, for the DSC measurements. Furthermore, the authors thank the reviewer for the useful hints to improve the manuscript.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  1. 1.Ceramic Materials EngineeringUniversity of BayreuthBayreuthGermany
  2. 2.Department of Applied Mechanics and Fluid DynamicsUniversity of BayreuthBayreuthGermany

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