为了研究聚对苯二甲酸乙二酯(PET)分子拉曼振动模式的特性, 采用拉曼光谱法对PET纤维的拉曼光谱特性进行研究, 并对PET纤维分别进行酸、 碱、 盐处理, 获得酸、 碱、 盐处理前后纤维的拉曼光谱, 分析与比较了处理前后拉曼光谱的特性; 同时, 采用原子力显微镜对其形貌结构进行观察。 结果表明, 在200～1 750 cm-1范围, NaOH处理的PET纤维的拉曼光谱强度高于未经处理的PET纤维, 当拉曼频移大于1 750 cm-1时, 经碱处理的PET拉曼峰强度低于未经处理的PET拉曼峰强度, 且荧光背景减弱, H2SO4处理的PET纤维强度显著低于未经处理的PET纤维, CuSO4处理的PET纤维强度较未经处理的PET纤维的强度明显增高。 原子力显微镜测结果表明, 碱和PET纤维分子的相互作用使化学键断裂, 分子结构发生改变, 经NaOH处理后的PET纤维表面较未经处理的PET纤维表面更为粗糙, H2SO4处理的PET表面相对未经处理的PET纤维表面粗糙度降低, 经CuSO4处理的PET纤维表面比未经处理的PET纤维粗糙度增加。 PET纤维的拉曼光谱与原子力显微镜结果相一致, 表明拉曼光谱与原子力显微镜的结合有望成为高聚物物性的表征技术。

Raman spectrometry was employed to study the characteristics of Raman spectra of polyethylene terephthalate (PET), which were treated with sodium hydroxide, sulfuric acid and copper sulfate, respectively. Raman spectra under different conditions were obtained and the characteristics of the Raman spectra were analyzed. The morphology structures were observed under different conditions using Atomic Force Microscope. The results show that the spectral intensity of PET treated with sodium hydroxide is higher than that untreated between 200～1 750 cm-1, while the intensity of PET treated with sodium hydroxide is lower than that untreated beyond 1 750 cm-1 and the fluorescence background of Raman spectra is decreased. The spectral intensity of PET treated with sulfuric acid is remarkably reduced than that untreated, and the intensity of PET treated with copper sulphate is much higher than that untreated. The research results obtained by Atomic Force Microscopy show that the variations of the Raman spectra of PET fibers are closely related to the chemical bonds and molecular structures of PET fibers. The surface of the PET treated with sodium hydroxide is rougher than that untreated, the surface roughness of the PET treated with sulfuric acid is reduced as compared to that untreated, while the surface roughness of the PET treated with copper sulphate is increased. The results obtained by Raman spectroscopy are consistent with those by Atomic Force Microscopy, indicating that the combination of Raman spectroscopy and Atomic Force Microscopy is expected to be a promising characterization technology for polymer characteristics.