聚四氟乙烯F-C-F伸缩振动二维红外光谱研究  

Two-dimensional Infrared Spectroscopy Study on Polytetrafluoroethylene F-C-F Stretching Vibration

作　　者：于宏伟[1] 韩卫荣[1] 刘磊[1] 顾丹丹[1] 牟微[1] 陈宁[1] 

机构地区：[1]石家庄学院化工学院,石家庄050035

出　　处：《材料导报》2014年第24期95-98,共4页Materials Reports

基　　金：河北省科技厅科学技术研究与发展计划(10215687);石家庄学院校级科研平台资助项目(XJPT008)

摘　　要：在303～393 K的温度范围内,测定聚四氟乙烯F-C-F伸缩振动模式（WCF2）的一维红外光谱.研究发现：1220 cm-1的红外吸收峰归属于聚四氟乙烯F-C-F不对称伸缩振动模式（VasCF2）,而1150 cm-1的红外吸收峰则归属于聚四氟乙烯F-C-F对称伸缩振动模式（VsCF2）.进一步研究了聚四氟乙烯VCF2的二阶导数红外光谱、四阶导数红外光谱,发现聚四氟乙烯VasCF2在1210 cm-1和1260 cm-1处裂分为双峰;而聚四氟乙烯VsCF2则在1145 cm-1、1155cm-1和1175 cm-1裂分为3个吸收峰.最后研究了聚四氟乙烯二维红外光谱,考察了温度对于聚四氟乙烯VCF2吸收强度变化的影响.研究发现：随着测定温度的升高,聚四氟乙烯VCF2红外吸收强度变化快慢的顺序为：1145 cm-1＞1210 cm-1＞ 1155 cm-1＞ 1175 cm-1＞ 1260 cm-1.本项研究拓展了二维红外光谱在聚四氟乙烯热变性方面的研究范围.The temperature effect of the F-C-F stretching vibration mode of polytetrafluoroethylene was studied by one-dimensional infrared spectroscopy in the temperature range from 303 K to 393 K.The polytetrafluoroethylene F-C-F asymmetrical stretching vibration mode （VasCF2） and symmetrical stretching vibration mode （VsCF2） occurred respectively near 1220 cm-1 and 1150 cm-1.Second derivative infrared spectra and fourth derivative infrared spectra of polytetrafluoroethylene were investigated also.The band resulting from the VasCF2 appeared near 1210 cm-1 and 1260 cm-1,but the band resulting from the VaCF2appeared near 1145 cm-1,1155 cm-1 and 1175 cm-1.Two-dimensional infrared spectra of polytetrafluoroethylene were studied to determine the sequence of VCF2 intensity changes.It had been found that the sequence of polytetrafluoroethylene intensity changes was 1145 cm-1 ＞1210 cm-1 ＞1155 cm-1 ＞1175 cm-1 ＞1260 cm-1.The study demonstrated the key roles of infrared spectroscopy in the analysis of thermal denaturation of the polytetrafluoroethylene.

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 聚四氟乙烯 

分 类 号：O434.3[机械工程—光学工程]