甲基硅油的三级红外光谱研究

Study on Three-step Infrared Spectroscopy of Methyl Silicone Oil

采用红外光谱(IR)研究了二甲基硅油(下称"甲基硅油")的结构,并以甲基硅油Si-O的伸缩振动(νSi-O)和CH3的摇摆振动(ρCH3)为研究对象,进一步开展了甲基硅油的变温红外光谱研究和二维红外光谱研究。结果表明,随着测试温度的升高,甲基硅油νSi-O和ρCH3对应的吸收强度降低;νSi-O吸收频率包括1 098、1 070、1 020和1 007 cm^-1,热扰动因素下,νSi-O吸收峰变化快慢顺序为:1 098 cm^-1>1 020 cm^-1>1 070 cm^-1>1 007 cm^-1;ρCH3吸收频率包括870、866和862 cm^-1,热扰动因素下,各吸收峰变化快慢顺序为:866 cm^-1>870 cm^-1>862 cm^-1。在同样的温度扰动因素下,νSi-O对应的官能团对温度变化更敏感。

The structure of methyl silicone oil was studied by infrared spectroscopy(IR),and the stretch vibration(νSi-O)of methyl silicone oil with Si-O bond and the swing vibration(ρCH3)of CH3 were studied,and whose temperature-dependent infrared spectroscopy(TD-IR)and two-dimensional infrared spectroscopy(2 D-IR)were discussed.Result show that with the increase of the temperature,the infrared absorption intensity ofνSi-OandρCH3 reduced.The absorption of vSi-Oincluding 1098,1070,1020 and 1007 cm^-1.Under the thermal disturbance,the sequence of infrared absorption peak changes were 1098 cm^-1>1020 cm^-1>1070 cm^-1>1007 cm^-1.The absorption ofρCH3 including 870,866 and 862 cm^-1,and the sequence of infrared absorption peak changes were 866 cm^-1>870 cm^-1>862 cm^-1.Under the same temperature disturbance,the functional groups corresponding to vSi-Owere more sensitive to temperature change.