PET碳氢弯曲振动模式三级红外光谱研究  

Three-step IR Spectroscopy of PET C-H Bending Vibration Mode

作　　者：武玉洁 常明[2] 赵茉含 李玉贤 孙爽 于宏伟[2] Wu Yujie;Chang Ming;Zhao Mohan;Li Yuxian;Sun Shuang;Yu Hongwei(Hebei Yipin Pharmaceutical Co.,Ltd.,Shijiazhuang 052165,China;School of Chemical Engineering,Shijiazhuang University,Shijiazhuang 050035,China)

机构地区：[1]河北一品制药股份有限公司,河北石家庄052165 [2]石家庄学院化工学院,河北石家庄050035

出　　处：《塑料科技》2019年第11期11-16,共6页Plastics Science and Technology

基　　金：石家庄市藁城区科学技术研究与发展计划课题(G201804)

摘　　要：采用红外光谱(IR)研究了聚对苯二甲酸乙二醇酯(PET)的分子结构。然后采用变温红外技术(TD-IR),以PET碳氢弯曲振动模式(δCH)为研究对象,开展了PET玻璃化转变研究。研究发现:随着测定温度的升高,PET分子δCH对应的吸收强度发生明显改变。采用二维红外光谱(2D-IR)进一步研究了PET的晶体结构。研究发现:718 cm-1处的新吸收峰归属于PET苯环晶体结构,其所对应的官能团对于温度变化比较敏感。本项研究拓展了三级红外光谱技术在重要高分子材料(如PET)中的研究范围。The polyethylene terephthalate(PET) structure was studied by infrared spectroscopy(IR). Then taking C-H bending vibration mode(δCH) as research object, the glass transition of PET was studied by temperature-dependent infrared spectroscopy(TD-IR). It was found that the absorption intensity corresponding to δCH obviously changed with the increase of measuring temperature. The crystal structure of PET was further investigated by the two dimensional infrared spectroscopy(2 D-IR). It was found that the new absorption peak at 718 cm-1 belonged to the benzene ring structure of PET, and the corresponding functional group of the absorption peak was more sensitive to temperature changes. The study expanded the research scope of three-step IR in the analysis of important polymer material(such as PET).

关 键 词：聚对苯二甲酸乙二醇酯 红外光谱 玻璃化转变 晶体结构 

分 类 号：TQ323.4[化学工程—合成树脂塑料工业] O657.33[理学—分析化学]