Linear organodecaborane block copolymer as a single-source precursor for porous boron carbide ceramics

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• 作者：Jinlong Wang ; Yanzi Gou ; ^{y.gou2012@hotmail.com} ; Qiance Zhang ; Ke Jian ; Zhou Chen ; Hao Wang ; ^{whlucky2002@hotmail.com}
• 关键词：Boron carbide ; Copolymer ; Precursor ; Ceramization ; Ceramic foams
• 刊名：Journal of the European Ceramic Society
• 出版年：2017
• 出版时间：May 2017
• 年：2017
• 卷：37
• 期：5
• 页码：1937-1943
• 全文大小：1709 K
• 卷排序：37

文摘

Boron carbide is one of the most widely used non-oxide ceramics as it possesses excellent physical and chemical properties. Much attention has been paid to prepare boron carbide ceramics via precursor derived method. In this work, poly(6-norbornenyldecaborane)-b-poly(6-cyclooctenyldecaborane) (PND-b-PCD) block copolymer was synthesized by the ruthenium-catalyzed ring-opening metathesis polymerization (ROMP) of 6-norbornenyldecaborane with 6-cyclooctenyldecaborane. The synthesized boron carbide preceramic polymer had good solubility and film-forming ability with a high ceramic yield of 75% at 850 °C. TGA, XRD and TG-IR-GC–MS were used to investigate the ceramization process of the precursor. Boron carbide ceramic foams were prepared by the precursor via replicating polyurethane foam template. The component, crystalline and morphology were investigated in detail. The ceramic foams showed a good high temperature performance and could keep their structure even up to 1800 °C.