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采用红外光谱结合二维相关分析技术,对添加不同固化促进剂的环氧树脂进行了快速鉴别研究。结果表明,二者在一维红外光谱图上没有差别,但是在二维红外相关谱图上却存在明显的差异。在对4000—2500cm-1和1600—730cm-1两个区域的同步和异步光谱进行研究后发现,配方B有甲基自动峰的出现,而配方A则无;配方A中基团变化顺序为:—CH3>—CH2>苯环C C,醚C—O—C>—CH2>苯环C C,环氧C—O—C>苯环C C,苯环CH>苯环C C,苯环CH>叔丁基C—C;配方B中基团变化顺序为:环氧C—O—C>苯环C C,醚C—O—C>苯环C C>叔丁基C—C,—CH3>苯环C C>叔丁基C—C。研究得到两种树脂体系中—OH、苯环C C、—CH2、—CH3、叔丁基C—C、醚C—O—C、环氧C—O—C、苯环CH等基团光谱强度的变化相关性。因此,二维相关红外光谱可以用于揭示树脂反应过程中的高分子链段内不同基团的变化规律和相互作用,并用于一维红外谱图无差别的树脂的鉴别。
Using infrared spectroscopy combined with two-dimensional correlation analysis technique, rapid identification of epoxy resins with different curing accelerators was carried out. The results show that there is no difference in the one-dimensional infrared spectra, but there are obvious differences in the two-dimensional infrared correlation spectrum. After studying the synchronous and asynchronous spectra of 4000-2500 cm-1 and 1600-730 cm-1, it was found that there was an appearance of methyl auto-peak in formula B, but no formula A, and the order of the change in formula A was : -CH3> -CH2> benzene ring CC, ether C-O-C> -CH2> benzene ring CC, epoxy C-O-C> benzene ring CC, benzene ring CH> benzene ring CC, benzene ring CH> tertiary Butyl C-C; the order of the groups in the formula B is: epoxy C-O-C> benzene ring CC, ether C-O-C> benzene ring CC> tert-butyl C-C, -CH3> benzene ring CC> tert-butyl C-C. The spectral intensities of -OH, benzene ring CC, -CH2, -CH3, t-butyl C-C, ether C-O-C, epoxy C-O-C, Correlation of changes. Therefore, two-dimensional correlation infrared spectroscopy can be used to reveal the variation rules and interactions of different groups in the polymer chain segment during the resin reaction, and is used for the identification of one-dimensional infrared spectrum undifferentiated resin.