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Rheologica Acta

Erschienen in:

01.06.2015 | Original Contribution

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

verfasst von: Octavio Flores, Lutz Heymann, Günter Motz

Erschienen in: Rheologica Acta | Ausgabe 6/2015

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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.

Vorheriger Artikel Self-associations and temperature dependence of aqueous solutions of zwitterionically modified N-isopropylacrylamide copolymers

Nächster Artikel Shear viscosity and rheology of ternary and quaternary lyotropic liquid crystals in discotic and calamitic nematic phases

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Titel: Rheological behaviour of tailored polysilazane melts for the processing of SiCN ceramics: viscoelastic properties and thermal stability
verfasst von: Octavio Flores
Lutz Heymann
Günter Motz
Publikationsdatum: 01.06.2015
Verlag: Springer Berlin Heidelberg
Erschienen in: Rheologica Acta / Ausgabe 6/2015
Print ISSN: 0035-4511
Elektronische ISSN: 1435-1528
DOI: https://doi.org/10.1007/s00397-015-0846-y

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