| Summary: | 碩士 === 國防大學理工學院 === 化學工程碩士班 === 106 === In this work, polymethylcarbosyilane (PMCS), which is referred as a novel polymeric precursor for manufacturing silicon carbide (SiC) fiber, was synthesized via an one-pot approach by using sodium, dimethyldicholoromsilane (DMDCS) and titanocene dichloride (TiCp2Cl2) as reactants. The reaction was conducted at ~100 ℃ under nitrogen atmosphere of 0.1 MPa. After synthesis and purification procedures, characterization of the as-prepared product was performed with FT-IR spectroscopy, 29Si NMR spectroscopy, GPC, and TG-DSC analysis. The results showed that Ti-containing PMCS with narrow molecular distribution could be successfully prepared via this approach. The fibers, derived from the electrospinning of the as-synthesized product, calcined at 1100 ℃ under N2, was identified to be a composite of SiC and TiC by XRD. The effects of the TiCp2Cl2-to -DMDCS molar ratio on the reaction conversion and the product 's characteristics such as thermal stability, molecular weight, and polydispersity were investigated. Based on the experimental results, a possible heterogeneous reaction mechanism was also proposed.
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