【摘要】 通过热解两种聚烷胺基环硼氮烷制备了氮化硼(BN),1000℃的热解产物为无定形BN。采用一系列分析手段,如元素分析、红外光谱(FTIR)、X射线衍射(XRD)、扫描电镜(SEM)和X电子散射能谱(EDS)等对两种先驱体聚合物热解过程中的结晶行为进行了表征。两种先驱体热解产物的化学组成接近,具有对称分子结构的分子先驱体得到的BN具有更高的结晶性能。这是由于对称分子的结构更加接近六方BN。此外,对结晶产物在空气中的抗氧化性能及惰性气氛中的高温稳定性进行了研究。更多还原

【Abstract】 Boron nitride(BN) samples were prepared by pyrolysis of two poly[(alkylamino)borazine]s.Amorphous BN were obtained in NH3 at 1000 °C.Based on a combination of different analysis apparatus such as elemental analysis(EA),Fourier transforms infrared spectra(FTIR),X-ray diffraction(XRD),Scanning electron microscopic(SEM),and Energy-dispersive spectrometry(EDS),evolution of crystallization during pyrolysis was researched.With similar composition,BN derived from symmetric monomer has a higher crystallinity.Crystallization behaviors are highly dependent on the structure of precursors.The reason is that the structure of symmetric molecular derived polymeric precursor is close to that of hexagonal BN(A-BN).Moreover,high temperature stabilities in air and Ar of the crystallized products were also studied.更多还原