caa a22 4500 605466394 CHVBK 20210128100307.0 cr unu---uuuuu 210128e20150601xx s 000 0 eng 10.1007/s00397-015-0846-y doi (NATIONALLICENCE)springer-10.1007/s00397-015-0846-y Rheological behaviour of tailored polysilazane melts for the processing of SiCN ceramics: viscoelastic properties and thermal stability [Elektronische Daten] [Octavio Flores, Lutz Heymann, Günter Motz] 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 ′ ω $$ G^{\prime}\left(\omega \right) $$ and loss modulus G ″ ω $$ G^{{\prime\prime}}\left(\omega \right) $$ 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. Springer-Verlag Berlin Heidelberg, 2015 Polysilazane nationallicence Linear viscoelasticity nationallicence Thermal stability nationallicence Time-temperature superposition principle nationallicence Glass transition temperature nationallicence SiCN ceramics nationallicence Flores Octavio Ceramic Materials Engineering, University of Bayreuth, D-95447, Bayreuth, Germany aut Heymann Lutz Department of Applied Mechanics and Fluid Dynamics, University of Bayreuth, D-95440, Bayreuth, Germany aut Motz Günter Ceramic Materials Engineering, University of Bayreuth, D-95447, Bayreuth, Germany aut Rheologica Acta Springer Berlin Heidelberg 54/6(2015-06-01), 517-528 0035-4511 54:6<517 2015 54 397 https://doi.org/10.1007/s00397-015-0846-y text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00397-015-0846-y text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Flores Octavio Ceramic Materials Engineering, University of Bayreuth, D-95447, Bayreuth, Germany aut NATIONALLICENCE 700 1- Heymann Lutz Department of Applied Mechanics and Fluid Dynamics, University of Bayreuth, D-95440, Bayreuth, Germany aut NATIONALLICENCE 700 1- Motz Günter Ceramic Materials Engineering, University of Bayreuth, D-95447, Bayreuth, Germany aut NATIONALLICENCE 773 0- Rheologica Acta Springer Berlin Heidelberg 54/6(2015-06-01), 517-528 0035-4511 54:6<517 2015 54 397