A novel PAN/silazane hybrid polymer for processing of carbon-based fibres with extraordinary oxidation resistance
A novel PAN/silazane hybrid polymer for processing of carbon-based fibres with extraordinary oxidation resistance
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DOI：
10.1039/c6ta09293d
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发表时间：
2017-01-14
影响因子：
11.9
通讯作者：
Motz, G.
中科院分区：
文献类型：
--
作者：
Ribeiro, L. F. B.;Flores, O.;Motz, G.
开发了一种由丙烯腈（AN）和市售低聚硅氮烷（ML 33）组成的新型混合聚合物，作为碳基纤维加工的前体，其具有高达800 ℃的非凡固有氧化稳定性。虽然聚丙烯腈用作碳纤维的典型前体，但聚硅氮烷衍生的SiCN陶瓷相应导致改善的抗氧化性。热重分析表明，取决于AN/ML 33的比例，热解过程中的重量损失急剧减少高达63%，由于两种组分之间的交联反应，通过NMR光谱研究证实。出乎意料的是，随着起始组合物中AN含量的增加，高达1500 ℃的热处理导致从无定形C/SiCN到C/Si 3 N4纳米复合材料的变化，这通过NMR、XRD和TEM测量证实。碳基体中均匀分布的陶瓷相是这种新型碳基纤维非凡的固有氧化稳定性的原因。
A novel hybrid polymer made up of acrylonitrile (AN) and a commercial available oligosilazane (ML33) was developed as a precursor for the processing of carbon-based fibres with extraordinary intrinsic oxidation stability up to 800 degrees C. While polyacrylonitrile is used as the typical precursor for carbon fibres, a polysilazane derived SiCN ceramic phase should lead to improved oxidation resistance. Thermogravimetric analysis demonstrated that depending on the AN/ML33 ratio the weight loss during pyrolysis is drastically reduced up to 63% due to crosslinking reactions between both components, confirmed by NMR spectroscopy investigations. Unexpectedly, with increasing AN content in the starting composition the thermal treatment up to 1500 degrees C leads to a change from amorphous C/SiCN to C/Si3N4 nanocomposites confirmed by NMR, XRD and TEM measurements. The homogeneously distributed ceramic phase within the carbon matrix is responsible for the extraordinary intrinsic oxidation stability of this new type of carbon-based fibre.