在303~393 K 温度范围内，采用变温傅里叶变换衰减全反射红外光谱(ATR-FTIR)技术分别测定硅氧树脂的一维红外光谱、二阶导数红外光谱和四阶导数红外光谱。研究发现，在1800~600 cm-1范围内，聚硅氧树脂主要存在着 CH 3伸缩振动模式(νCH3)、CH 3变形振动模式(δCH3)、CH 3摇摆振动模式(ρCH3)、Si-O 伸缩振动模式(νSi-O )和 Si-C 伸缩振动模式(νSi-C )。在1100~1000 cm-1范围内，以νSi-O 为研究对象，研究了温度对硅氧树脂分子结构的影响。实验发现，随着测定温度的升高，硅氧树脂νSi-O 的主要红外吸收频率出现了明显的红移现象。进一步研究了硅氧树脂νSi-O 的二维红外光谱，考查温度对于νSi-O 红外吸收强度的影响。研究发现，随着测定温度的升高，硅氧树脂νSi-O 红外吸收强度的变化快慢顺序为：1024 cm-1>1096 cm-1>1010 cm-1>1076 cm-1>1083 cm-1>1064 cm-1。本研究拓展了 ATR-FTIR 技术在硅氧树脂材料热变性方面的研究范围。
The polysiloxanes molecular structure had been studied by one-dimensional infrared spectroscopy, second derivative infrared spectroscopy and fourth derivative infrared spectroscopy with fourier transform attenuated total reflection infrared spectroscopy (ATR-FTIR)in the temperature range from 303 K to 393 K.The CH 3 stretch vibration mode (νCH3 ),the CH 3 bending vibration mode (δCH3 ),the CH 3 swing vibration mode (ρCH3 ),the Si-O stretch vibration mode (νSi-O )and the Si-C stretch vibration mode (νSi-C )were found from 1800 cm-1 to 600 cm-1 .The tempe-rature effect of the polysiloxanes molecular structure had been studied byνSi-O from 1 100 cm-1 to 1000 cm-1 and red shift was found obviously.Two-dimensional infrared spectroscopy of polysiloxanes was studied to determine the se-quence of intensity changes.It had been found that the sequence of intensity changes was 1024 cm-1 > 1096 cm-1 >1010 cm-1 > 1076 cm-1 > 1083 cm-1 > 1064 cm-1 with the increase of temperature.The study demonstrated the key roles of ATR-FTIR in the analysis of thermal denaturation of the polysiloxanes.
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