【摘要】 在293~393 K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变角振动模式(δCH2)。研究发现,聚乙烯分子中存在晶区,非晶区,晶区/非晶区过渡区。随着测定温度的升高,聚乙烯分子中δCH2红外吸收强度变化快慢顺序为:1 457 cm-1(δ(CH2)amorphous)>1 468 cm-1(δ(CH2)interfacial region)>1 462 cm-1(δ(CH2)crystalline)>1 473 cm-1(δ(CH2)crystalline)。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。更多还原

【Abstract】 In the temperature range from 293 K to 393 K,the polyethylene molecular structure had been studied by onedimensional infrared spectroscopy,second derivative infrared spectroscopy,fourth derivative infrared spectroscopy and deconvolution infrared spectroscopy. The polyethylene CH2 scissoring bond vibration( δCH2) was researched by twodimensional infrared spectroscopy. The ordered crystalline region,disordered amorphous region and crystal / amorphous interfacial region were found also. Two-dimensional infrared spectroscopy of polyethylene was studied to determine the sequence of intensity changes. It had been found that the sequence of intensity changes was 1 457 cm- 1( δ( CH2) amorphous)> 1 468 cm- 1( δ--( CH2) interfacial region) > 1 462 cm 1( δ( CH2) crystalline) > 1 473 cm 1( δ( CH2) crystalline). The study demonstrated the key roles of two-dimensional infrared spectroscopy in the analysis of thermal denaturation of the polymer materials.更多还原