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Citation: WANG Xiao-Zhou, WANG Jun, TANG Yun, LI Wen-Hua, WANG Hao. Characterization and Rheological Property of Polyborosilazane[J]. Chinese Journal of Applied Chemistry, ;2009, 26(10): 1211-1215. shu

Characterization and Rheological Property of Polyborosilazane

1.
State Key Laboratory of Advanced Ceramic Fibers & Composites, National University of Defense Technology, Changsha 410073

Corresponding author: WANG Jun,
Received Date: 25 September 2008
Available Online: 8 February 2009
Fund Project: 国防基础科研(A2820060068) (A2820060068)国家自然科学基金(50702075) (50702075)国防科技重点实验室基金(9140C8203050603, 9140C8202050804)资助项目 (9140C8203050603, 9140C8202050804)

Polyborosilazane(PBSZ),a novel precursor of SiBNC ceramic,was synthesized via polycondensation approach with a yield of about 90%(mass fraction) from dichloromethylsilane(MeHSiCl₂),boron trichloride(BCl₃) and hexamethydisilazane((CH₃)₃SiNHSi(CH₃)₃). Precursors with different softening points can be obtained by altering the dosage of MeHSiCl₂. Rheological study shows that PBSZ melt is a typical shear thinning fluid. The shear rate,the flow index,the apparent viscosity and the viscous flow activation energy are 10~110 s^-1,0.83~0.90,440~2 460 Pa·s,and 142 kJ/mol,respectively. The as-synthesized polyborosilazane shows a good melt-spinning processability and continuous fibers with diameter 20 μm and length1 600 m can easily be obtained.
- Polyborosilazane,
- synthesis,
- rheological property,
- melt-spinning
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