Nearly stoichiometric BN fiber with low dielectric constant derived from poly[(alkylamino)borazine]
2011
Lei, Yongpeng | Wang, Yingde | Song, Yongcai | Li, Yihe | Deng, Cheng | Wang, Hao | Xie, Zhengfang
Nearly stoichiometric boron nitride (BN) fiber with low dielectric constant was prepared by curing, pyrolysis of a novel poly[(alkylamino)borazine] (PAAB) under NH₃ up to 1200°C in a ceramic yield of 60wt.%. Based on IR, XRD, XPS and elemental analysis (EA), the fiber with a composition of BN₁.₀₉ shows a characteristic of turbostratic BN (t-BN). The tensile strength is approximately 0.6GPa with 13μm in diameter. Moreover, the fiber possesses very low real part (ε′) of 2.66 and loss tangent (tan δ) of 0.0012 at 10GHz, respectively, making it possible to be used in microwave-transparent material.
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