Chem. J. Chinese Universities ›› 2010, Vol. 31 ›› Issue (3): 623.

• Articles • Previous Articles    

Preparation and Characterization of Polymeric Precursor for Boron Nitride Fibers

DENG Cheng, SONG Yong-Cai*, WANG Ying-De, LI Yi-He, LEI Yong-Peng   

  1. College of Aerospace & Materials Engineering, State Key Laboratory of Advanced Ceramic Fibers & Composites, National University of Defense Technology, Changsha 410073, China
  • Received:2009-03-26 Online:2010-03-10 Published:2010-03-10
  • Contact: SONG Yong-Cai. E-mail: songyongcai@yahoo.com.cn
  • Supported by:

    国家“八六三”计划项目(批准号: 2006AA03A217)资助.

Abstract:

Based on B-trichloroborazine(TCB) with boron-nitrogen ring structure, the monomer was synthesized by substitution reaction with different molar ratio of propylamine/isopropylamine, then the corresponding polyborazine was obtained through thermal polymerization. The chemical component and structure of polyborazine were analyzed, and the influence of different propylamine/isopropylamine molar ratio on the polyborazine properties and spinnability were examined. The results indicate that polyborazine precursor prepared at 150 ℃ for 10 h and propylamine/isopropylamine molar ratio 2∶1, could possess nearly linear molecule skeleton and be prone to melt spinnability. When melt at 90 ℃, the precursor fibers are prepared with average diameter 10—20 μm and BC1.27N1.52Hx structure. After curing process and sintered in NH3 at 1200 ℃, the near-stoichiometric BN fibers was obtained, which proved this precursor is apt for preparation of BN fibers.

Key words: B-trichloroborazine; Polyborazine; Precursor of boron nitride fiber

TrendMD: