PAN基炭纤维中sp2杂化的C—C原子键距与结构参数之间关系

摘要: 利用Raman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Raman散射的测试结果，从Fitzer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。

Abstract: PAN-based carbon fibers with different carbonization temperatures were characterized by Raman scattering and X-ray diffraction. The length of the sp2 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 sp2 hybrid C—C bond length with structural parameters (La, Lc, d002) were obtained. It was found that sp2 hybrid C—C bond length increases with La, Lc and decreases with d002.