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Preparation of silicon carbide fibers from the blend of solid and liquid polycarbosilanes

机译:由固态和液态聚碳硅烷的混合物制备碳化硅纤维

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摘要

A highly branched liquid polycarbosilane (LPCS) was added into a solid polycarbosilane (PCS) to give a polymer blend. It was then melt-spun into precursor fibers, oxidation-cured in hot-air, and converted into ceramic fibers by pyrolysis under nitrogen. It was found that the addition of the LPCS resulted in a significant drop on the spinning temperature from 285 A degrees C (without LPCS) to 225 A degrees C (with 15% LPCS), while the spinning ability of the polymer blend was also markedly improved over the solid PCS. Furthermore, the LPCS enhanced the oxidation curing, reducing the curing temperature and hence the tendency for fiber partial melting and sticking. However, the strength of the silicon carbide fibers decreased owing to the presence of the LPCS. The effects of the LPCS addition and their mechanisms on the fiber processing and properties were studied using FTIR, NMR, GPC, XRD, SEM, and elemental analysis.
机译:将高度支化的液态聚碳硅烷(LPCS)添加到固体聚碳硅烷(PCS)中,以形成聚合物共混物。然后将其熔融纺丝成前体纤维,在热空气中氧化固化,并通过在氮气下的热解转化为陶瓷纤维。发现添加LPCS会导致纺丝温度从285 A(无LPCS)显着下降到225 A(含15%LPCS),而聚合物共混物的纺丝能力也显着下降。改进了坚固的PCS。此外,LPCS增强了氧化固化,降低了固化温度,从而降低了纤维部分熔融和粘结的趋势。然而,由于存在LPCS,碳化硅纤维的强度降低。使用FTIR,NMR,GPC,XRD,SEM和元素分析研究了添加LPCS及其机理对纤维加工和性能的影响。

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