在293～393K范围内,分别测定聚乙烯的一维红外光谱、二阶导数红外光谱、四阶导数红外光谱和去卷积红外光谱来确定聚乙烯分子结构.进一步采用二维红外光谱研究了聚乙烯亚甲基面内摇摆振动模式( .CH 2 ).研究发现,聚乙烯分子中同时存在晶区和非晶区.随着测定温度的升高,CH2 720 cm－1(CH 2) ＞731 cm－1(CH 2)聚乙烯分子中.红外吸收强度变化快慢顺序为:( .crystalline)( .crystalline)＞725 cm－1( .(CH 2 ) amorphous).此项研究显示出二维红外光谱在高分子材料热变性分析中的重大作用.

In the temperature range from 293 K to 393 K,the polyethylene molecular structure has been studied by one-dimensional infrared spectroscopy,second derivative infrared spectroscopy,fourth derivative infrared spectroscopy and deconvolution infrared spectroscopy.The polyethylene CH2 rocking vibration( .CH 2 )was researched by two-dimensional infrared spectroscopy.The ordered crystalline region and disordered amorphous region were also found.Two-dimensional infrared spectroscopy of polyethylene were studied to determine the sequence of intensity changes.It has been found that the sequence of intensity changes was 720 cm－1(CH 2) ＞731 cm－1(CH 2) ＞725 cm－1(CH 2)(.crystalline)(.crystalline)(.amorphous).The study demonstrated the key roles of two-dimensional infrared spectroscopy in the analysis of thermal denaturation of the polymer materials.