化学学报 ›› 2010, Vol. 68 ›› Issue (12): 1217-1222. 上一篇    下一篇

研究论文

甲胺/二甲胺共取代合成氮化硼先驱体聚硼氮烷

邓橙*,1,宋永才*,1,王应德1,李义和1,雷永鹏1,曹淑伟2   

  1. (1国防科技大学航天与材料工程学院新型陶瓷纤维及其复合材料国防科技重点实验室 长沙 410073)
    (2航天材料及工艺研究所 北京 100076)
  • 投稿日期:2009-08-27 修回日期:2009-11-12 发布日期:2010-01-18
  • 通讯作者: 邓橙 E-mail:dcnudt@163.com
  • 基金资助:

    国家863计划项目(2006AA03A217)资助

Synthesis of Polymeric Precursor for Boron Nitride through Substitution Reaction of Methylamine/Dimethylamine

Deng Cheng*,1 Song Yongcai*,1 Wang Yingde1 Li Yihe1 Lei Yongpeng1 Cao Shuwei2   

  1. (1 State Key Laboratory of Advanced Ceramic Fibers & Composites, College of Aerospace & Materials Engineering, National University of Defense Technology, Changsha 410073)
    (2 Aerospace Research Institute of Materials & Processing Technology, Beijing 100076)
  • Received:2009-08-27 Revised:2009-11-12 Published:2010-01-18
  • Contact: DENG Cheng E-mail:dcnudt@163.com

将三氯环硼氮烷(TCB)与甲胺/二甲胺进行共胺解取代反应, 首先制得了不同胺基的取代单体, 经过进一步热聚合反应合成了聚硼氮烷先驱体. 通过对不同单体的聚合产物组成与结构分析, 探讨了不同取代基对热聚合反应及产物结构的影响. 研究表明, 当控制甲胺/二甲胺摩尔比为1∶2, 聚合温度180 ℃, 获得的聚硼氮烷数均分子量为7603, 分子量分散系数为1.80, 熔点为83 ℃, 组成为BC0.76N1.39H2.5, 该聚合物具有近似线性分子结构, 表现出优良的可纺性, 可制得平均直径10~15 μm的先驱体纤维, 为制备氮化硼纤维奠定了基础.

关键词: 三氯环硼氮烷, 聚硼氮烷, 氮化硼纤维先驱体, 制备

Based on B-trichloroborazine (TCB) with boron-nitrogen ring structure, the monomer was synthesized by substitution reaction with different ratio of methylamine/dimethylamine, then the corresponding polyborazine was obtained through thermal polymerization. The chemical component and structure of polyborazine were analyzed, and the influence of different methylamine/dimethylamine molar ratio on the polyborazine properties and spinnability were examined. The results indicated when the molar ratio of methylamine/dimethylamine was 1∶2, the polyborazine with chemistry stability was prepared through thermal polymerization at 180 ℃. The melting point, number average molecular weight and polydispersity index of polyborazine precursor was 83 ℃, 7603 and 1.80, respectively. The polyborazine precursor could possess nearly linear molecule skeleton and show good processability. The precursor fibers were prepared with average diameter 10~15 μm and BC0.76N1.39H2.5 structure, which suggested that the as-achieved polymer could be used as a precursor for BN ceramic fibers.

Key words: B-trichloroborazine, polyborazine, boron nitride fibers precursor, preparation

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