PAN基炭纤维中sp^2杂化的C—C原子键距与结构参数之间关系

Relations between sp^2 hybrid C—C bond length and structure parameters of PAN-based carbon fibers

利用Ram an散射及X射线衍射方法,对不同炭化温度下制备的PAN基炭纤维样品进行了测试。根据Ram an散射的测试结果,从F itzer碳键键距出发,给出了PAN基炭纤维中sp2杂化的C—C原子键距a0随炭化温度的变化规律。由各样品的X射线衍射测试结果,得到了各样品的结构参数(La、Lc、d002)。分析了sp2杂化的C—C原子键距a0随结构参数(La、Lc、d002)变化的原因。结果表明,C—C原子键距a0与石墨化程度有关,且随La、Lc的增大及d002的减小C—C原子键距增大。

PAN-based carbon fibers with different carbonization temperatures were characterized by Raman scattering and X-ray diffraction. The length of the sp^2 hybrid C--C bond was obtained on the basis of Fitzer＇ s C-C bond length formula. Structural parameters （La, Lc, d002 ） of graphite were obtained by X-ray diffraction measurements. The dependences of sp^2 hybrid C-C bond length with structural parameters （La, Lc, d002 ） were obtained. It was found that sp^2 hybrid C-C bond length increases with La, Lc and decreases with d002.