【摘要】 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。更多还原

【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 (L_a, L_c, d₀₀₂) of graphite were obtained by X-ray diffraction measurements. The dependences of sp² hybrid C—C bond length with structural parameters (L_a, L_c, d₀₀₂) were obtained. It was found that sp² hybrid C—C bond length increases with L_a, L_c and decreases with d₀₀₂.更多还原