锦纶-66ν_(amide-Ⅰ)和ν_(amide-Ⅱ)三级红外光谱

Third-step Infrared Spectroscopy Study of Chinlon-66 νamide-Ⅰ and νamide-Ⅱ

在4000 cm^(-1)～600 cm^(-1)的频率范围内,采用一维及二阶导数红外光谱研究了锦纶-66的分子结构。以锦纶-66的νamide-Ⅰ和ν_(amide-Ⅱ)为研究对象,采用变温红外光谱技术进一步开展了锦纶-66热稳定性研究。实验发现,在303 K～393 K的温度范围内,锦纶-66的νamide-Ⅰ对应的红外吸收频率出现了蓝移现象,而锦纶-66的ν_(amide-Ⅱ)对应的红外吸收频率出现了红移现象。分别开展了锦纶-66的νamide-Ⅰ和ν_(amide-Ⅱ)的二维红外光谱研究。实验发现:锦纶-66的νamide-Ⅰ的红外吸收频率包括:1640 cm^(-1)(ν_(amide-Ⅰ-1)),1620 cm^(-1)(ν_(amide-Ⅰ-2)),而随着测定温度的升高,锦纶-66的νamide-Ⅰ的红外吸收峰变化快慢顺序为:1620 cm^(-1)(ν_(amide-Ⅰ-2))> 1640cm^(-1)(ν_(amide-Ⅰ-1));锦纶-66的ν_(amide-Ⅱ)的红外吸收频率包括:1562 cm^(-1)(ν_(amide-Ⅱ-1)),1535 cm^(-1)(ν_(amide-Ⅱ-2))和1515 cm^(-1)(ν_(amide-Ⅱ-3)),而随着测定温度的升高,锦纶-66的ν_(amide-Ⅱ)红外吸收峰变化快慢顺序为:1535 cm^(-1)(ν_(amide-Ⅱ-2))> 1562 cm^(-1)(ν_(amide-Ⅱ-1))> 1515 cm^(-1)(ν_(amide-Ⅱ-3))。最后同时开展了锦纶-66的νamide-Ⅰ/ν_(amide-Ⅱ)的二维红外光谱的研究。研究发现,随着测定温度的升高,锦纶-66的νamide-Ⅰ/ν_(amide-Ⅱ)对应的红外吸收峰变化快慢顺序为:1535cm^(-1)(ν_(amide-Ⅱ-2))> 1620cm^(-1)(ν_(amide-Ⅰ-2))> 1562cm^(-1)(ν_(amide-Ⅱ-1))> 1640 cm^(-1)(ν_(amide-Ⅰ-1))> 1515cm^(-1)(ν_(amide-Ⅱ-3))。拓展了三级红外光谱技术在纺织材料结构及热稳定性方面的研究范围。

The Chinlon-66 organic molecular structure was characterized by the one-dimensional infrared spectroscopy and second derivative infrared spectroscopy in the frequency scope of 4000 cm-1~600 cm^-1.Taking chinlon-66νamide-Ⅰandνamide-Ⅱas research subjects,the thermal stability of Chinlon-66 was studied by variable temperature infrared spectroscopy(303 K^393 K).The results showed that the blue shift of corresponding infrared frequency ofνamide-Ⅰwas found obviously and the red shift ofνamide-Ⅱwas discovered later.The 2D-IR spectroscopy of Chinlon66 ofνamide-Ⅰandνamide-Ⅱwere researched respectively.The experiment discovered that the band resulting from theνamide-Ⅰappeared near 1640 cm-1(νamide-Ⅰ-1)and 1620 cm^-1(νamide-Ⅰ-2),and the sequence of infrared absorption peak changes wered1620 cm^-1(νamide-Ⅰ-2)>1640 cm^-1(νamide-Ⅰ-1)with the increase of temperature.The band resulting from theνamide-Ⅱwere 1562 cm^-1(νamide-Ⅱ-amorphpus-1),1535 cm^-1(νamide-Ⅱ--amorphpus-2)and 1515 cm^-1(νamide-Ⅱ-crystal),but the infrared absorption peak changes were 1535 cm^-1(νamide-Ⅱ-2)>1562 cm^-1(νamide-Ⅱ-1)>1515 cm-1(νamide-Ⅱ-3).The 2D-IR spectroscopy of Chinlon66νamide-Ⅰ/νamide-Ⅱwas studied at the same time.The sequence of infrared absorption peak changes were 1535 cm-1(νamide-Ⅱ-2)>1620 cm^-1(νamide-Ⅰ-2)>1562 cm-1(νamide-Ⅱ-1)>1515 cm^-1(νamide-Ⅱ-3)>1640 cm^-1(νamide-Ⅰ-1).The study expanded the research scope of third-step infrared spectroscopy in the analysis of structure and thermal stability of the technical textiles materials.