The synthesis of SiCON ceramics through precursor method

Abstract

A polymeric precursor, polysiloxazane (PSON), for SiCON ceramics has been synthesized by the partial hydrolysis of MeViSiCl 2 , MeHSiCl 2 , and MeSiCl 3 followed by ammonolysis reaction of the hydrolyzed intermediates with NH 3 . The structure and thermal properties of the polymeric precursor were investigated by means of Fourier transfer infrared spectra (FTIR), 1 H-NMR, 29 Si-NMR, gel permeation chromatography, and thermogravimetric analysis. The structure of the SiCON ceramics derived from the pyrolysis of PSON was characterized by FTIR and X-ray diffraction. The as-synthesized PSON produced mainly a-Si 3 N 4 crystalline phase during pyrolysis at 1500 C under N 2 atmosphere, whereas when pyrolyzed at 1500 C under Ar atmosphere, crystalline phases of a/b-SiC and/or a-Si 3 N 4 were detected. V C 2012 Wiley Periodicals, Inc. J fAppl Polym Sci 126: [853][854][855][856][857][858][859] 2012

Hydrophobic, transparent and hard silicon oxynitride coating from perhydropolysilazane

“…As reported, the dehydrogenation reaction as shown in Fig. will occur when NH 3 is dissolved in the reaction system in the synthesis process . Thus, a large amount of HSi(NH) 3 structure exists in the polymer.…”

“…2 will occur when NH 3 is dissolved in the reaction system in the synthesis process. 19 Thus, a large amount of HSi(NH) 3 structure exists in the polymer. In the 1 H NMR spectrum, the broad peak between 0.80 ppm and 1.75 ppm is attributed to N-H bonds.…”

Impact of SiO2 doping on the structure and oil–water separation properties of a PVDF membrane: insights from molecular dynamics simulation

“…The PVDF single chain, consisting of 40 difluoroethylene repeating units, was constructed using the Forcite module. 46 SiO 2 clusters were then randomly distributed within the PVDF membrane to form a hybrid SiO 2 /PVDF model. The concentration of SiO 2 varied from 3.5 wt% to 15.5 wt%, while the initial density of the PVDF membrane was set to 1.7 g cm −3 .…”