乙纶二维中红外光谱研究

2D-MIR spectroscopy Study of Polyethylene

采用中红外(MIR)光谱开展了乙纶的分子结构研究。研究发现乙纶的红外吸收模式主要包括:νasCH2-乙纶、νsCH2-乙纶、δCH2-乙纶和ρCH2-乙纶。以乙纶νasCH2-乙纶、νsCH2-乙纶、δCH2-乙纶和ρCH2-乙纶为研究对象,采用二维中红外(2D-MIR)光谱进一步开展了乙纶的热稳定性研究。研究发现乙纶νas CH2-乙纶-二维对应的红外吸收频率包括:2918cm-1(νas CH2-1-乙纶-二维)和2910cm-1(νas CH2-2-乙纶-二维)。乙纶νs CH2-乙纶-二维对应的红外吸收频率包括:2852cm-1(νs CH2-1-乙纶-二维)、2848cm-1(νs CH2-2-乙纶-二维)和2842cm-1(νs CH2-3-乙纶-二维)。随着测定温度的升高,乙纶νCH2-乙纶-二维吸收峰变化快慢的顺序为:2918cm-1(νas CH2-1-乙纶-二维)>2842cm-1(νs CH2-3-乙纶-二维)>2852cm-1(νs CH2-1-乙纶-二维)>2848cm-1(νs CH2-2-乙纶-二维)>2910cm-1(νas CH2-2-乙纶-二维)。乙纶δCH2-乙纶-二维对应的红外吸收频率包括:1472cm-1(δCH2-1-乙纶-二维)、1464cm-1(δCH2-2-乙纶-二维)和1462cm-1(δCH2-3-乙纶-二维)。随着测定温度的升高,乙纶δCH2-乙纶-二维吸收峰变化快慢的顺序为:1464cm-1(δCH2-2-乙纶-二维)>1462cm-1(δCH2-3-乙纶-二维)>1472cm-1(δCH2-1-乙纶-二维)。乙纶ρCH2-乙纶-二维对应的红外吸收频率包括:732cm-1(ρCH2-1-乙纶-二维)、728cm-1(ρCH2-2-乙纶-二维)、720cm-1(ρCH2-3-乙纶-二维)和716cm-1(ρCH2-4-乙纶-二维)。随着测定温度的升高,乙纶ρCH2-乙纶-二维吸收峰变化快慢的顺序为:732cm-1(ρCH2-1-乙纶-二维)>720cm-1(ρCH2-3-乙纶-二维)>716cm-1(ρCH2-4-乙纶-二维)>728cm-1(ρCH2-2-乙纶-二维)。本项研究拓展了2D-MIR光谱在重要的纺织材料(乙纶)结构及热稳定性的研究范围。

The molecular structure of polyethylene(PE)were studied by the infrared(MIR)spectroscopy.The studied showed that the infrared absorption modes of polyethylene includedνasCH2-PE,νsCH2-PE,δCH2-PE andρCH2-PE.Taking polyethyleneνasCH2-PE,νsCH2-PE,δCH2-PE andρCH2-PE as study objects,the thermal stability study of polyethylene were conducted by two dimensional infrared(2D-MIR)spectroscopy.The results revealed that the infrared absorption frequency of polyethyleneνas CH2-1-PE-2D included 2918 cm-1(νas CH2-1-PE-2D)and 2910 cm-1(νas CH2-2-PE-2D);infrared absorption frequency of polyethyleneνs CH2-PE-2D included 2852 cm-1(νs CH2-1-PE-2D),2848 cm-1(νs CH2-2-PE-2D)and 2842 cm-1(νs CH2-3-PE-2D);with the increase of measuring temperature,the sequence of PE/νCH2-PE-2D absorption peak changes were 2918 cm-1(νas CH2-1-PE-2D)>2842 cm-1(νs CH2-3-PE-2D)>2852 cm-1(νs CH2-1-PE-2D)>2848 cm-1(νs CH2-2-PE-2D)>2910 cm-1(νas CH2-2-PE-2D).The infrared absorption frequency of polyethyleneδCH2-PE-2D included 1472 cm-1(δCH2-1-PE-2D),1464 cm-1(δCH2-2-PE-2D)and 1462 cm-1(δCH2-3-PE-2D);with the increase of measuring temperature,the sequence of PE/δCH2-PE-2D infrared absorption peak changes were1464 cm-1(δCH2-2-PE-2D)>1462 cm-1(δCH2-3-PE-2D)>1472 cm-1(δCH2-1-PE-2D).The infrared absorption frequency of polyethyleneρCH2-PE-2D included 732 cm-1(ρCH2-1-PE-2D),728 cm-1(ρCH2-2-PE-2D),720 cm-1(ρCH2-3-PE-2D)and 716 cm-1(ρCH2-4-PE-2D);with the increase of measuring temperature,the sequence of PE/ρCH2-PE-2D infrared absorption peak changes were732 cm-1(ρCH2-1-PE-2D)>720 cm-1(ρCH2-3-PE-2D)>716 cm-1(ρCH2-4-PE-2D)>728 cm-1(ρCH2-2-PE-2D).The study enlarged the research scope of 2D-MIR spectroscopy in the structure and thermal stability of important textile material(polyethylene).