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Effects of polymer matrices to the formation of silicon carbide (SiC) nanoporous fibers and nanowires under carbothermal reduction

机译:碳热还原下聚合物基体对碳化硅(SiC)纳米多孔纤维和纳米线形成的影响

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摘要

SiC fibers with varied nano-scale morphologies (i.e., nanowires, nanoparticles, etc) were successfully fabricated by the electrospinning of preceramic polyureasilazane (PUS) with either poly(methyl methacrylate) (PMMA) or polystyrene (PS) into composite fibers that were subsequently carbothermally reduced to ceramics via pyrolysis in argon at 1560 °C. While SiC fibers from either composite fibers contained polycrystalline cubic SiC ((3-SiC) structure, their fiber morphologies and atomic compositions differed due to the distinct thermal behaviors and decomposition pathways of PMMA and PS. Pyrolysis at 1000 °C produced fibrous mats of amorphous SiCO from PUS/PMMA with high O (32.5%) content or from PUS/PS with high C (74.7%) content. These differences led to distinct SiC fiber morphologies from further pyrolysis at 1560 ° C, i. e., an interconnected fibrous mat of nanoparticle-filled porous core and wrinkled sheath fibers from PUS/PS and fragmented nanoparticle-filled porous fibers intermixed with abundant 100 nm diameter nanowires with straight, beaded and bamboo-like morphologies from PUS/PMMA.
机译:通过将陶瓷前的聚脲硅氮烷(PUS)与聚(甲基丙烯酸甲酯)(PMMA)或聚苯乙烯(PS)电纺成复合纤维,成功地制造了具有各种纳米级形貌的SiC纤维(即,纳米线,纳米颗粒等)在1560°C下通过氩气热解将碳热还原为陶瓷。尽管两种复合纤维中的SiC纤维均含有多晶立方SiC((3-SiC)结构),但由于PMMA和PS的热行为和分解途径不同,它们的纤维形态和原子组成也有所不同。在1000°C的高温下热解产生了非晶态纤维垫O(32.5%)含量高的PUS / PMMA或C(74.7%)含量高的PUS / PS的SiCO。这些差异导致1560°C的进一步热解产生了独特的SiC纤维形态,即相互连接的纤维毡来自PUS / PS的纳米颗粒填充的多孔核和皱纹皮纤维,以及分散的纳米颗粒填充的多孔纤维与直径100 nm的纳米线混合而成,这些纳米线具有PUS / PMMA的笔直,串珠和竹样形态。

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