%0 Journal Article %T Boron-modified polysilazane as a novel single-source precursor for SiBCN ceramic fibers: synthesis, melt-spinning, curing and ceramic conversion %+ Laboratoire des Multimatériaux et Interfaces (LMI) %+ Max-Planck-Institut für Metallforschung %A Bernard, Samuel %A Weinmann, M. %A Gerstel, P. %A Miele, P. %A Aldinger, F. %< avec comité de lecture %@ 0959-9428 %J Journal of Materials Chemistry %I Royal Society of Chemistry %V 15 %N 2 %P 289 %8 2005 %D 2005 %R 10.1039/B408295H %Z Chemical Sciences %Z Chemical Sciences/Material chemistry %Z Engineering Sciences [physics]Journal articles %X A novel boron-modified polysilazane functionalised with Si- and N-bonded methyl groups has been synthesised and characterised by means of FT-IR and NMR spectroscopies as well as elemental analysis. Both Si- and N-bonded methyl groups inhibited extensive cross-linking to yield a tractable polymer which was successfully processed into polymer green fibers by a melt-spinning process. After the shaping processing, the N-bonded methyl groups offered the capability of facile polymer cross-linking in an ammonia atmosphere at 200 °C to increase the ceramic yield of the polymer and avoid inter-fiber fusion. The as-obtained cured fibers were subsequently pyrolysed at 1400 °C in a nitrogen atmosphere to provide amorphous and stable Si3.0B1.0C5.0N2.4 ceramic fibers with ca. 1.3 GPa in tensile strength, ca. 170 GPa in Young's modulus and ca. 23 μm in diameter. %G English %L hal-02617034 %U https://cnrs.hal.science/hal-02617034 %~ CNRS %~ UNIV-LYON1 %~ LMI %~ INC-CNRS %~ UDL %~ UNIV-LYON %~ TEST2-HALCNRS %~ TEST3-HALCNRS