- Poly(phenylene-carborane) for boron-carbide/carbon ceramic precursor synthesized via nickel catalysis
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- 论文类型： 期刊论文
- 发表时间： 2017-04-21
- 发表刊物： POLYMER
- 收录刊物： SCIE、EI
- 卷号： 115
- 页面范围： 224-231
- ISSN号： 0032-3861
- 关键字： Ni(0)-catalyzed polymerization; Poly( phenylene-carborane); Boron-carbide
- 摘要： High thermally and thermo-oxidatively stable poly(phenylene-carborane) (PPB) was synthesized via Ni(0)-catalyzed polymerization of bis(aryl chloride) monomer containing carborane. This polymer was soluble in THF and NMP at room temperature, thus allowing molecular weight and spectroscopic analysis. Number-average molecular weight determined by H-1-NMR spectroscopy was 5.4 x 103 g/mol. The crystalline character of PPB was verified by XRD analysis. This polymer exhibited excellent thermal and thermo-oxidative stability with 5% weight loss temperature to be 707 degrees C and > 1000 degrees C in nitrogen and air, respectively. High char yields of 93.2% and 97.9% were obtained at 1000 degrees C in nitrogen and air, respectively. Additionally, PPB has proven to be excellent sing-source precursor to boron-carbide/carbon ceramic materials with high ceramic yields in the range of 91.1%-92.6%. According to XRD analysis, boron carbide crystallization for PPB occurred between 1000 and 1200 degrees C. (C) 2017 Published by Elsevier Ltd.
