Synthesis and Characterization of Monomer and its Polymer as a Precursor to Boron Nitride Fiber
Boron Nitride is a kind of advanced ceramics, which are deemed to be excellent candidates for high-temperature structural applications. It was reported that B (NHMe)<,3> and its polymer had been prepared, 1 however, the polymer is poor for processing due to its network structural. In this article, a new monomer, (Me<,2>N) B (NHMe)<,2>, was prepared by firstly reaction of borontrichloride (lmol) with dimethylamine (lmol), and then reaction with excess methylamine (2.5mol) at low temperature (-80℃). Heating this monomer under nitrogen protection up to 170℃ through a four-step procedure, resulted in its conversion to a yellow solid polymer, which was expected be linear or less network structure. The monomer and polymer were characterized by <1>H NMR, <11>B NMR, <13>C NMR, and FTIR, DSC, TGA. Results show that the precursor could be spun into fibers.
Ceramics boron nitride precursor
XIE Weiwei HAN Keqing LI Shutong BI Hongyan YU Muhuo
College of Material Science and Engineering, Donghua University, Shanghai 201620, P. R. China State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Donhua University, S
国际会议
上海
英文
72-74
2007-10-15（万方平台首次上网日期，不代表论文的发表时间）