Abstract—The stability of the atomic structure and physical and chemical properties of new materials is of crucial importance for their practical use. Long-term (more than 5 × 10⁵ min) and regular monitoring of the molecular structure of a poly(vinylidene fluoride) film sample after its chemical dehydrofluorination and rinsing with ethanol is performed by the infrared (IR) spectroscopy technique. Changes in the absorption spectra of stretching oscillations of CH and OH bonds in the wave-number range 2500–3700 cm^–1 are analyzed. The results of the study indicate the initial attachment of ethoxy groups to carbonized fragments of carbon chains and their subsequent detachment, accompanied by sample oxidation. A feature with a center near 3090–3100 cm^–1 is found to be in all spectra, the origin of which cannot be unambiguously identified at present. A previously unknown effect of a steady, but different-rate decrease in the contribution to the infrared absorption of stretching vibrations of four molecular complexes of ethoxy groups is revealed. The oscillation frequencies of three of them steadily increase also at different rates.

摘要—新材料的原子结构稳定性以及理化性质对其实际应用至关重要。通过红外（IR）光谱技术对聚偏二氟乙烯薄膜样品进行化学脱氟化和乙醇漂洗后，进行长期（超过5×10 ⁵分钟）的定期监测并定期监测其分子结构。分析了波数在2500-3700 cm ^-1范围内的CH和OH键的拉伸振动的吸收光谱的变化。研究结果表明，乙氧基最初附着在碳链的碳化片段上，随后脱离，并伴有样品氧化。中心在3090–3100 cm ^–1附近的特征发现存在于所有光谱中，目前尚不能确定其来源。揭示了一种先前未知的效应，即乙氧基的四个分子复合物的拉伸振动对红外吸收的贡献稳定但不同程度地降低。它们中的三个的振荡频率也以不同的速率稳定地增加。