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Thermal behaviour of a series of poly[B-(methylamino)borazine] for the preparation of boron nitride fibers
Authors:Sylvain Duperrier  Rodica Chiriac  Catherine Sigala  Christel Gervais  Samuel Bernard  David Cornu  Philippe Miele
Affiliation:1. Laboratoire des Multimatériaux et Interfaces, UMR CNRS 5615, Université Lyon 1, Université de Lyon 1, 43 Bd du 11 Novembre 1918, 69622 Villeurbanne Cedex, France;2. Laboratoire de Chimie de la Matière Condensée, UMR CNRS 7574, Université Pierre et Marie Curie, 4 Place Jussieu, tour 54, étage 5, 75252 Paris Cedex, France;1. School of Materials Science and Engineering, South China University of Technology, Guangzhou 510641, China;2. State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou 510641, China;3. Institute of Optical Communication Materials, South China University of Technology, Guangzhou 510641, China;1. Science and Technology on Thermostructural Composite Materials Laboratory, Northwestern Polytechnical University, Xi''an, 710072, PR China;2. Key Laboratory for Advanced Corrosion and Protection of Aviation Materials, AECC Beijing Institute of Aeronautical Materials, Beijing, 100095, PR China;1. School of Physics, Shandong University, Jinan 250100, China;2. School of Environmental Science and Engineering, Shandong University, Jinan 250100, China;1. Center for Cell Pathology Research, Department of Biological Science, Khazar University, Baku, Azerbaijan;2. Department of Chemical Engineering, School of Engineering and Applied Science, Khazar University, Baku, Azerbaijan;3. Nanotechnology Laboratory, School of Engineering and Applied Science, Khazar University, Baku, Azerbaijan;4. Mechanical and Aerospace Engineering Department, University of California, Los Angeles, USA;5. Department of Bioengineering, University of California, Los Angeles, USA;6. Department of Biochemistry, Azerbaijan Medical University, Baku, Azerbaijan;1. State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China;2. Graduate University of the Chinese Academy of Sciences, Beijing 100049, China
Abstract:The thermal behaviour of a series of polyB-(methylamino)borazine] prepared at various temperatures ranging from 140 to 200 °C is studied in the present paper as potential BN fiber precursors. It was shown that the softening capability of polyB-(methylamino)borazine] can be tailored by controlling the temperature at which polymers were prepared to achieve melt-spinning and produce high quality green fibers. Thus as-spun fibers could be next converted into boron nitride fibers using ammonia (25–1000 °C) and nitrogen (25–1800 °C) atmospheres. The quality of boron nitride fibers was shown to depend on the first part of the pyrolysis step (25 and 1000 °C; ammonia atmosphere) in which the great majority of the weight loss necessary for boron nitride production occurs. Ideal polyB-(methylamino)borazine] as BN fiber precursors are those prepared between 170 and 180 °C. They display appropriate melt-spinnability and ceramic conversion capability.
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