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      탄화규소의 전구체로서 Polycarbosilane 의 합성 및 물성 비교 연구 = Study on the Synthesis of Polycarbosilane as a SiC Precursor and its Comparative Property

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      https://www.riss.kr/link?id=A3024379

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      Polycarbosilane(PCS) as a SiC precursor was synthesized from the rearrangement reaction of polydimethysilane(PDMS) in an autoclave, which was prepared by dehalocoupling reaction of dichlorodimethylsilane. After fractional precipitation into three fractions in n-hexane-methanol mixture, they were characterized by FT-IR, NMR, GPC, TGA/DSC and XRD, and compared with the commercial product. We found that the molecular weight distributions of the PCS depended on the reaction pressures, temperatures and the reaction times, and affected thermal property and ceramic yield of the polymer. The monodispersed PCS containing less amount of oligomers and nonsoluble products was prepared by reaction of PDMS at 420℃ for 10 hrs, and it also gave the greatest amount of medium molecular weight(M_n=4,000) fraction. v
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      Polycarbosilane(PCS) as a SiC precursor was synthesized from the rearrangement reaction of polydimethysilane(PDMS) in an autoclave, which was prepared by dehalocoupling reaction of dichlorodimethylsilane. After fractional precipitation into three frac...

      Polycarbosilane(PCS) as a SiC precursor was synthesized from the rearrangement reaction of polydimethysilane(PDMS) in an autoclave, which was prepared by dehalocoupling reaction of dichlorodimethylsilane. After fractional precipitation into three fractions in n-hexane-methanol mixture, they were characterized by FT-IR, NMR, GPC, TGA/DSC and XRD, and compared with the commercial product. We found that the molecular weight distributions of the PCS depended on the reaction pressures, temperatures and the reaction times, and affected thermal property and ceramic yield of the polymer. The monodispersed PCS containing less amount of oligomers and nonsoluble products was prepared by reaction of PDMS at 420℃ for 10 hrs, and it also gave the greatest amount of medium molecular weight(M_n=4,000) fraction. v

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