Abstract
AbstractIn this study, an SiC ceramic precursor vinyl ether–grafted liquid polycarbosilane (VE–LHBPCS) with approximate formulas of [SiH1.95(OCH2CH2OCH = CH2)0.05CH2]n was designed and synthesized. In order to cross‐link the ceramic precursor via fast thiol‐ene click reaction. The VE–LHBPCS was mixed with 1‐wt% ultraviolet (UV) decomposable free radical initiator BAPOs and 7‐wt% bis‐thiol compound 1,6‐hexanedithiol. According to Fourier transform infrared spectroscopy spectroscopy and photolithography experiment, more than 80% vinyl ether group was consumed within 3 s, and photolithography pattern with clear boundary could be formed after UV irradiation for only 1 s. Even for the VE–LHBPCS mixture with a thickness of 4 mm, 20‐s UV irradiation was sufficient to cure it with smooth surface and regular edge. Thermal gravimetric analysis demonstrated that the UV‐cured VE–LHBPCS mixture had a ceramic yield of 70.0 wt% at 1000°C, which was 20 wt% higher than that of raw LHBPCS. After pyrolysis up to 1000°C, about 29.5% isotropic linear shrinkage associated with the precursor‐to‐ceramic conversion was observed, and black dense ceramic with a density of 2.49 ± 0.09 g/cm3 and a chemical formula of SiC1.01O0.18S0.04 was obtained. With increasing the pyrolysis temperature, the content of element S decreased and the diffraction peaks of β‐SiC became sharper and stronger.
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