A New Silicon-Containing Arylacetylene Resin With Amine Groups as Precursor to Si−C−N Ceramic

A new preceramic precursor was prepared by chlorination and ammoniation reaction of poly(methylsilyleneethynylenephenyleneethynylene) (MSEPE), [−SiH(CH3)− C≡C−C6H4−C≡C−]n. The obtained amine-modified silicon-containing arylacetylene resin (MSEPE-An) was a liquid polymer at room temperature and could be thermally cross-linked at temperatures lower than 200°C. The chemical structure of MSEPE-An was characterized by FTIR, 1H NMR, and GPC. The pyrolysis of the cured MSEPE-An was carried out in N2 atmosphere up to 1450°C to produce a Si−C−N ceramic composite. The ceramic composite was analyzed by FTIR and X-ray diffraction techniques. The electromagnetic wave absorption properties of a paraffin sample with 10 vol% Si−C−N ceramic powders were characterized in a frequency range of 2–18 GHz, according to a conventional reflection/transmission technique. Experimental results demonstrated that the Si−C−N ceramic composite provided good electromagnetic wave absorption performance.

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