聚丙烯C—H弯曲振动二维红外光谱研究  

Two-dimensional Infrared Spectroscopy Study of Polypropylene C—H Bending Vibration

作　　者：韩卫荣[1] 王欣[1] 王志刚[1] 朱巍[1] 周殿元[1] 于宏伟[1] 

机构地区：[1]石家庄学院,石家庄050035

出　　处：《包装工程》2015年第21期7-10,27,共5页Packaging Engineering

基　　金：石家庄学院校级科研平台(XJPT008)

摘　　要：目的通过二维红外光谱技术研究温度对聚丙烯化学结构的影响。方法在1500-1350 cm^-1的频率范围内,分别测定聚丙烯C—H弯曲振动模式（δC-H）的一维红外光谱、二阶导数红外光谱和四阶导数红外光谱来确定聚丙烯分子结构,后采用二维红外光谱研究温度对聚丙烯δC-H红外吸收强度的影响。结果聚丙烯δC-H主要包括甲基不对称碳氢弯曲振动模式（δas CH3）、甲基对称碳氢弯曲振动模式（δs CH3）和亚甲基碳氢弯曲振动模式（δCH2）,随着测定温度的升高,聚丙烯分子中δC-H红外吸收强度变化快慢顺序为δCH2-2（1464 cm^-1）〉δCH2-1（1475 cm^-1）〉δas CH3（1455 cm^-1）〉δs CH3（1375 cm^-1）。结论二维红外光谱在有机高分子包装材料热变性分析具有重大作用。The effect of temperature on the chemical structure of polypropylene was studied using two-dimensional infrared spectroscopy. In the frequency range of 1500-1350 cm^-1, the molecular structure of polypropylene was studied by one-dimensional infrared spectroscopy, second derivative infrared spectroscopy and fourth derivative infrared spectroscopy of C-H bending vibration（δC-H）. Two-dimensional infrared spectroscopy was then used to study the effect of temperature on the δC-Hinfrared absorbance intensity of polypropylene. The polypropylene δC-Hmainly included methyl asymmetrical bending vibration mode（δas CH3）, methyl symmetrical bending vibration mode（δs CH3） and methylene bending vibration mode（δCH2）. With increase of the measurement temperature, the sequence of intensity changes in the δC-Hinfrared absorbance intensity of polypropylene was δCH2-2（1464 cm^-1）〉δCH2-1（1475 cm^-1）〉δas CH3（1455 cm^-1）〉δs CH3（1375 cm^-1）. The study demonstrated the key roles of two-dimensional infrared spectroscopy in the analysis of thermal denaturation of the polymer packaging materials.

关 键 词：一维红外光谱 二阶导数红外光谱 四阶导数红外光谱 二维红外光谱 聚丙烯 

分 类 号：TB484.3[一般工业技术—包装工程] O434.3[机械工程—光学工程]