Chemistry, structure and processability of boron-modified polysilazanes as tailored precursors of ceramic fibers

Gottardo, Laura; Bernard, Samuel; Gervais, Christel; Inzenhofer, Kathrin; Motz, Günter; Weinmann, Markus; Bălan, Corneliu; Miele, Philippe

doi:10.1039/c2jm15919h

Cited by 45 publications

(29 citation statements)

References 77 publications

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“…The spectra of SiBCN/HfN show a broad peak at 18.6 ppm, implying the existence of 3-coordinate boron in the ceramics [31,32]. The isotropic signal at 0 ppm can be attributed to tetragonal coordinated boron [23]. From the spectra of SiBCN, the signals are similar to that of SiBCN/HfN.…”

Section: Polymer-to-ceramic Transformationsupporting

confidence: 54%

“…In addition, isotropic signal at 0 ppm which can be attributed to tetragonal coordinated boron [23]. From the spectra of PBSZHf, the slight shift of signals infers that the chemical structures of B relative bonds are changed slightly after modification.…”

Section: Synthesis Of Polymermentioning

confidence: 92%

“…A broad band at 844 cm À1 is due to SieN bond attached to boron. There are two peaks at 3398 and 1172 cm À1 due to the asymmetric stretching bands of NeH [23,24]. The absorption band at 2133 cm À1 is SieH bond.…”

Section: Synthesis Of Polymermentioning

confidence: 95%

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Synthesis and characteristic of SiBCN/HfN ceramics with high temperature oxidation resistance

Wang

Zhang

Sun

et al. 2016

Journal of Alloys and Compounds

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Section: Polymer-to-ceramic Transformationsupporting

confidence: 54%

Section: Synthesis Of Polymermentioning

confidence: 92%

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Synthesis and characteristic of SiBCN/HfN ceramics with high temperature oxidation resistance

Wang

Zhang

Sun

et al. 2016

Journal of Alloys and Compounds

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“…Hydroboration is confirmed in the 13 C NMR spectrum of BPSZ 15 through the disappearance of the vinyl contribution at δ =130 to 145 ppm (Figure b). Again, it is not possible to discuss the presence of aliphatic carbon atoms of the C 2 H 4 units that form by hydroboration of H 2 C=CH moieties that usually appear in the δ =8 to 30 ppm range of the 13 C NMR spectrum . The 29 Si NMR spectra of BPSZ 30 and BPSZ 15 are similar to the spectrum of PSZ (Figure c).…”

Section: Resultsmentioning

confidence: 96%

Molecular Chemistry and Engineering of Boron‐Modified Polyorganosilazanes as New Processable and Functional SiBCN Precursors

Viard

Fonblanc

Schmidt

et al. 2017

Chemistry A European J

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A series of boron-modified polyorganosilazanes was synthesized from a poly(vinylmethyl-co-methyl)silazane and controlled amounts of borane dimethyl sulfide. The role of the chemistry behind their synthesis has been studied in detail by using solid-state NMR spectroscopy, FTIR spectroscopy, and elemental analysis. The intimate relationship between the chemistry and the processability of these polymers is discussed. Polymers with low boron contents displayed appropriate requirements for facile processing in solution, such as impregnation of host carbon materials, which resulted in the design of mesoporous monoliths with a high specific surface area after pyrolysis. Polymers with high boron content are more appropriate for solid-state processing to design mechanically robust monolith-type macroporous and dense structures after pyrolysis. Boron acts as a crosslinking element, which offers the possibility to extend the processability of polyorganosilazanes and suppress the distillation of oligomeric fragments in the low-temperature region of their thermal decomposition (i.e., pyrolysis) at 1000 °C under nitrogen. Polymers with controlled and high ceramic yields were generated. We provide a comprehensive mechanistic study of the two-step thermal decomposition based on a combination of thermogravimetric experiments coupled with elemental analysis, solid-state NMR spectroscopy, and FTIR spectroscopy. Selected characterization tools allowed the investigation of specific properties of the monolith-type SiBCN materials.

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“…The main motivation to implement the PDCs route lies in the special advantages that are offered by molecular or polymeric precursors in controlling ceramic compositions and micro-/nanostructures (amorphous, crystalline or nanocomposite) and in processing materials in particular shapes and morphologies (dense or porous) that are difficult, or even impossible to obtain by conventional routes. As an illustration, this synthesis method has been applied to the preparation of simple carbides, nitrides of various main groups and transition elements [25,26,27] as well as homogeneous mixtures or solid solutions of pseudo-binary combinations of ceramics and nanocomposites [28,29,30,31]. It represents a synthetic approach in which the chemistry of molecular precursors is designed at atomic scale to deliver the desired inorganic polymer (called preceramic polymer) composition.…”

Section: Introductionmentioning

confidence: 99%

Polymer-Derived Boron Nitride: A Review on the Chemistry, Shaping and Ceramic Conversion of Borazine Derivatives

Bernard

Miele

2014

Materials

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Boron nitride (BN) is a III-V compound which is the focus of important research since its discovery in the early 19th century. BN is electronic to carbon and thus, in the same way that carbon exists as graphite, BN exists in the hexagonal phase. The latter offers an unusual combination of properties that cannot be found in any other ceramics. However, these properties closely depend on the synthesis processes. This review states the recent developments in the preparation of BN through the chemistry, shaping and ceramic conversion of borazine derivatives. This concept denoted as Polymer-Derived Ceramics (PDCs) route allows tailoring the chemistry of precursors to elaborate complex BN shapes which cannot be obtained by conventional process. The effect of the chemistry of the molecular precursors, i.e., borazine and trichloroborazine, and their polymeric derivatives i.e., polyborazylene and poly[tri(methylamino)borazine], in which the specific functional groups and structural motifs determine the shaping potential by conventional liquid-phase process and plastic-forming techniques is discussed. Nanotubes, nano-fibers, coatings, monoliths and fiber-reinforced matrix composites are especially described. This leads to materials which are of significant engineering interest.

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Chemistry, structure and processability of boron-modified polysilazanes as tailored precursors of ceramic fibers

Abstract: PAPER Laura Gottardo et al. Chemistry, structure and processability of boron-modifi ed polysilazanes as tailored precursors of ceramic fi bers Chemistry, structure and processability of boron-modified polysilazanes as tailored precursors of ceramic fibers †

Cited by 45 publications

References 77 publications

Synthesis and characteristic of SiBCN/HfN ceramics with high temperature oxidation resistance

Synthesis and characteristic of SiBCN/HfN ceramics with high temperature oxidation resistance

Molecular Chemistry and Engineering of Boron‐Modified Polyorganosilazanes as New Processable and Functional SiBCN Precursors

Polymer-Derived Boron Nitride: A Review on the Chemistry, Shaping and Ceramic Conversion of Borazine Derivatives

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