Conversion of B(NHCH3)3 into boron nitride and polyborazine fibres and tubular BN structures derived therefrom

被引:34
作者
Cornu, D
Miele, P
Faure, R
Bonnetot, B
Mongeot, H
Bouix, J
机构
[1] Univ Lyon 1, CNRS, Lab Multimat & Interfaces, UMR 5615, F-69622 Villeurbanne, France
[2] Univ Lyon 1, LICAS, Lab Chim Analyt 2, F-69622 Villeurbanne, France
关键词
D O I
10.1039/a808213h
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The reaction of ammonia with tris(methylamino) borane B(NHCH3)(3) 1 or with a B(NHCH3)(3) derived polyborazine 2 led to completely different processes. Compound 1 reacted spontaneously with NH, to give mainly the borazine (CH3NH)(3)B3N3H3 and subsequently a BN prepolymer which was not processible. A polymer 2 obtained by heating 1 under argon could be spun into crude polyborazinic fibres. When 2 was heated under ammonia in order to obtain carbon Free BN, it was partially dissociated into 1,3,5-trimethyl-2,3,6-tri(amino) borazine (NH2)(3)B3N3(CH3)(3) 3. The borazine 3 was fully characterised by multinuclear NMR spectroscopy, FTIR and mass spectrometry. The structure of 3 has been confirmed by a single crystal X-ray diffraction analysis. An illustration of the formation of 3 was the formation of BN tubes from crude fibres. These results were explained by the TGA curves of the polymer 2 under ammonia or nitrogen.
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页码:757 / 761
页数:5
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