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

Rheological behaviour of tailored polysilazane melts for the processing of SiCN ceramics: viscoelastic properties and thermal stability
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用于加工 SiCN 陶瓷的定制聚硅氮烷熔体的流变行为:粘弹性和热稳定性

DOI:
10.1007/s00397-015-0846-y
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发表时间:
2015
期刊:
影响因子:
2.3
通讯作者:
G. Motz
G. Motz
中科院分区:
工程技术3区
文献类型:
--
作者:
O. Flores;L. Heymann;G. Motz

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研究了具有不同反应官能团(Si-H、N-H和si -乙烯基)的三种聚硅氮杂烷的线性粘弹性。用热重分析(TGA)和差示扫描量热法(DSC)的数据比较了模量随温度的变化。特别强调了它们的热稳定性。所研究的聚硅氮烷是低分子量的无定形聚合物。存储和损耗模量在75至150°C(取决于特定材料)范围内测量,并成功应用了遵循Williams-Landel-Ferry (WLF)方程的时间-温度叠加。一种交联的低聚硅氮烷ML33S和固体聚硅氮烷ABSE,给出了非晶态低分子量聚合物的典型结果。反应性较强的交联低聚硅氮烷HTTS表现出偏离行为。
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 storageand loss moduluswere 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.
DOI: --
发表时间: 1970
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