氮化硼
微球
热解
聚合
材料科学
氮化物
化学工程
化学
纳米技术
聚合物
复合材料
工程类
图层(电子)
作者
Zexia Li,Jingwen Yang,Hejun Gao,Jiaxiao Qiao,Wei Qiao,Peng Wang,Jun Zhang,Chengchun Tang,Yanming Xue
出处
期刊:ACS omega
[American Chemical Society]
日期:2023-04-21
卷期号:8 (17): 15239-15248
标识
DOI:10.1021/acsomega.3c00313
摘要
Microspheric BN materials have high application potential because they have better fluidity and dispersion ability to endow hexagonal boron nitride (h-BN) ceramics and h-BN/polymer composites with highly desired performance. In this work, a novel synthetic route to the BN microspheres has been developed by means of a controllable pyrolysis of polymerized spherical precursors. The precursor formation mechanism is proposed to be the F-127-induced self-assembling polymerization of a boric acid–melamine–formaldehyde (MF) colloid. It is found that ammonia-annealing of an air-pyrolysis (700 °C) intermediate causes higher BN phase transformation within final BN microspheres with more uniform diameter distribution compared to those of direct ammonia-pyrolysis of spherical precursors at the same temperatures of 1100 and 1500 °C. After ammonia-annealing and ammonia-pyrolyzed treatment at 1100 and 1500 °C, the obtained BN microspheres have a low specific surface area (SSA) property, but replacing part of melamine with dicyandiamide could increase their SSAs to more than 1000 m2/g. We believe that this new microspherical BN preparation with more facile and controllable operation would be well suited for industrialization.
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