ホウ酸-エタノールアミン縮合物の熱分解による窒化ホウ素及び炭化ホウ素の生成

抄録

Boron nitride was formed from boric acid-diethanolamine or -triethanolamine condensation products by their pyrolysis in a nitrogen flow. The condensation products obtained from boric acid-diethanolamine system (molar ratio 1:1 and 2:3) were glassy solids and had a polymeric structure containing the B-O-C bond. Monomeric triethanolamine borate, which contained both B-O-C and coordinate B-N bonds, was formed from boric acid-triethanolamine system. Pyrolysis of these condensation products in N₂ flow at 1400°C yielded boron nitride. A small amount of B₄C was also formed, depending on the molar ratio or on the carbon content of the condensation products. In order to clarify the effect of the nitrogen in the molecules, the pyrolysis was conducted in an argon flow. Both BN and B₄C were formed and the influence of nitrogen in the precursors on the pyrolyzed products was observed.