聚四氟乙烯F-C-F伸缩振动二维红外光谱研究

材料导报, 2014, 28(24): 95-98. doi: 10.11896/j.issn.1005-023X.2014.24.022

聚四氟乙烯F-C-F伸缩振动二维红外光谱研究

于宏伟 ^1, , 韩卫荣 ^2, , 刘磊 ^3, , 顾丹丹 ^4, , 牟微 ^5, , 陈宁 ^6,

1.石家庄学院化工学院,石家庄,050035

2.石家庄学院化工学院,石家庄,050035

3.石家庄学院化工学院,石家庄,050035

4.石家庄学院化工学院,石家庄,050035

5.石家庄学院化工学院,石家庄,050035

6.石家庄学院化工学院,石家庄,050035

基金项目: 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)

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

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

Keywords： one-dimensional infrared spectroscopy , second derivative infrared spectroscopy , fourth derivative infrared spectroscopy , two-dimensional infrared spectroscopy , polytetrafluoroethylene

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.

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