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Abstract：
Low-frequency peaks in the Raman spectra of amorphous poly(ether ether ketone) (PEEK) were investigated. An amorphous sample with zero crystallinity, as confirmed by wide-angle X-ray diffraction, was used in this study. In a previous study, two peaks were observed in the low-frequency Raman spectra of the crystallized samples. Among these, the peaks at 135 cm-1 disappeared for the amorphous sample. Meanwhile, for the first time, the peak at 50 cm-1 was observed in the crystallized sample. Similar to the peak at 135 cm-1, the peak at 50 cm-1 disappeared in the amorphous state, and its intensity increased with increasing crystallinity. The origins of the two peaks were associated with the Ph-CO-Ph-type intermolecular vibrational modes in the simulation. This suggests that the Ph-CO-Ph vibrational mode observed in the low-frequency region of PEEK was strongly influenced by the intermolecular order.
摘要：
研究了无定形聚醚醚酮（PEEK）的拉曼光谱中的低频峰。结晶度为零的无定形样品，广角X射线衍射证实，在这项研究中使用。在之前的研究中,在结晶样品的低频拉曼光谱中观察到两个峰。其中,无定形样品在135cm-1处的峰消失。同时,第一次,在结晶样品中观察到50cm-1处的峰。与135cm-1处的峰相似，50cm-1处的峰在非晶态消失，其强度随着结晶度的增加而增加。两个峰的起源与模拟中的Ph-CO-Ph型分子间振动模式有关。这表明在PEEK的低频区域中观察到的Ph-CO-Ph振动模式受到分子间顺序的强烈影响。
