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- W2029705038 abstract "The synthesis of boron-containing polysilylcarbodi-imides of general type {B[C2H4(R)SiNCN]3}n [6a R = CH3, 6b R = H, 6c R = (NCN)0.5] by different reactions and their thermal behaviour are discussed. The title compounds 6a–6c can be obtained by a hydroboration reaction of BH3*S(CH3)2 (5) with the vinyl-substituted polysilylcarbodi-imides [(H2C=CH)(R)SiNCN]n [3a R = CH3, 3b R = H, 3c R = (NCN)0.5], which themselves are accessible from the reaction of the vinyl-substituted chlorosilanes (H2C=CH)(R)SiCl2 (1a R = CH3, lb R = H, 1c R = Cl) with stoichiometric amounts of H2N-C≡N (2). Furthermore, a method for the synthesis of compounds 6a–6c is given by treatment of compounds 1a–1c with (H3C)3SiN=C=NSi(CH3)3 (4). An alternative reaction sequence, which finally leads to compounds 6a–6c is the hydroboration of the monomeric vinyl-substituted chlorosilanes 1a–1c with BH3 * S(CH3)2 (5) to yield the chlorosilylethylboranes B[C2H4(R)SiCl2]3 (7a R = CH3, 7b R = H, 7c R = Cl) at first. Treatment of compounds 7a–7c with (H3C)3SiN=C=NSi(CH3)3 (4), even with or without solvent, stoichiometrically or with excess 4, produces the hydroborated polysilylcarbodi-imides 6a–6c. The thermogravimetric behaviour of the polysilycarbodi-imides 3a–3c as well as the boron-containing polymers 6a–6c have been determined by simultaneous TGA (20–1100°C, argon, heating rate 2 Kmin−1). The ceramic yields of the polymers are in the range of 53–73%, depending on the structure and the composition of the polymers applied." @default.
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- W2029705038 date "1997-08-01" @default.
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- W2029705038 title "Boron-containing polysilylcarbodi-imides: A new class of molecular precursors for Si-B-C-N ceramics" @default.
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- W2029705038 doi "https://doi.org/10.1016/s0022-328x(97)00085-5" @default.
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