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.
						
				
					 
				
	        
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	                	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.- 
								Keywords:
								
- Polyborosilazane,
- synthesis,
- rheological property,
- melt-spinning
 
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