Abstract
A preceramic polymer of B,B′,B′′-(dimethyl)ethyl-acrylate-silyloxyethyl-borazine was synthesized by three steps from a molecular single-source precursor and characterized by Fourier transform infrared (FTIR) and nuclear magnetic resonance (NMR) spectrometry. Six-member borazine rings and acrylate groups were effectively introduced into the preceramic polymer to activate UV photo-induced polymerization. Photo-Differential Scanning Calorimetry (Photo-DSC) and real-time FTIR techniques were adapted to investigate the photo-polymerization process. The results revealed that the borazine derivative exhibited dramatic activity by UV polymerization, the double-bond conversion of which reached a maximum in 40 s. Furthermore, the properties of the pyrogenetic products were studied by scanning electron microscopy (SEM) and X-ray diffraction (XRD), which proved the ceramic annealed at 1100 °C retained the amorphous phase.
Highlights
Precursor-derived quaternary Si/B/C/N random networks consisting of the elements silicon, carbon, boron and nitrogen, exhibit remarkably high thermal, chemical, and mechanical stability in oxygen free atmospheres, even at temperatures up to 2000–2200 ̋ C [1,2,3,4,5,6]
Si/B/C/N can be prepared by the powder-sintering method, the chemical-vapor-deposition (CVD) method, the chemical-vapor-infiltration (CVI) method and as polymer-derived ceramics (PDCs)
1.18 ppm, while the resonance singlet signal for the NH proton atoms of the borazine rings appear at 4.0 ppm
Summary
Precursor-derived quaternary Si/B/C/N random networks consisting of the elements silicon, carbon, boron and nitrogen, exhibit remarkably high thermal, chemical, and mechanical stability in oxygen free atmospheres, even at temperatures up to 2000–2200 ̋ C [1,2,3,4,5,6]. Si/B/C/N can be prepared by the powder-sintering method, the chemical-vapor-deposition (CVD) method, the chemical-vapor-infiltration (CVI) method and as polymer-derived ceramics (PDCs). In the PDC method, the polymerization stage plays a crucial role in determining the final properties of the resulting ceramic materials. Single molecules can be polymerized via chemical, thermal, photo- induced and other approaches. Conventional chemical polymerization processes need the presence of reactive agents such as methylamine [11], ammonia, thionyl chloride, nitrogen dioxide, nitric oxide, halogenated or unsaturated hydrocarbon, etc. The new Si/B/C/N ceramic has been studied by SEM and XRD
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
