Modification of a liquid polycarbosilane with 9-BBN as a high-ceramic-yield precursor for SiC

作者：Yu Zhaoju; Huang Muhe; Fang Yunhui; Li Ran; Zhan Junying; Zeng Birong; He Guomei; Xia Haiping^*; Zhang Litong

来源：Reactive and Functional Polymers, 2010, 70(6): 334-339.

DOI：10.1016/j.reactfunctpolym.2010.02.007

• Polycarbosilane
• Boron
• Silicon carbide
• Hydroboration
• Precursor

Allyhydridopolycarbosilane (AHPCS) was partially modified with 9-borabicyclo-[3.3 1] nonane (9-BBN) via conventional hydroboration. The as-synthesized boron-modified AHPCS (B-AHPCS) was characterized by gel-permeation chromatography. Fourier transformed infrared spectroscopy (FTIR), and nuclear magnetic resonance spectroscopy. The results indicated that hydroboration did occur via the consumption of C = C groups. In comparison with the parent AHPCS, the B-AHPCS retained the hyperbranched structure as expected. The thermal properties of B-AHPCS were investigated by thermal gravimetric analysis The ceramic yield of B-AHPCS reached 75% at 1000 degrees C, 15% higher than that of the parent AHPCS. The structural evolution of the B-AHPCS during heat treatment was characterized by FTIR. At high temperatures, the introduction of <1 wt.% boron significantly inhibited SIC crystallization.

• 出版日期2010-6
• 单位厦门大学