| 摘要: |
| 目的 采用红外光谱法研究Parafilm的分子结构。方法 采用变温傅里叶变换衰减全反射红外光谱（ATR-FTIR）技术，分别研究Parafilm的一维变温光谱、二阶导数变温光谱、四阶导数变温光谱及去卷积变温光谱。结果 Parafilm主要存在着CH3不对称伸缩振动模式、CH2不对称伸缩振动模式、CH2对称伸缩振动模式、CH2变角振动模式、CH3不对称变角振动模式、CH3对称变角振动模式、C—C骨架伸缩振动模式和CH2面内摇摆振动模式等8种红外吸收模式，最终确定Parafilm的主要分子结构为聚异丁烯。采用变温ATR-FTIR技术（293~393 K）进一步开展 Parafilm 热稳定性研究，研究发现Parafilm的热稳定较差，而其临界使用温度为313 K。结论 该研究拓展了变温ATR-FTIR技术在高分子包装材料的结构及热稳定性方面的研究范围。 |
| 关键词: 红外光谱 Parafilm 结构 热稳定性 聚异丁烯 |
| DOI： |
| 分类号:TB484；O434.3 |
| 基金项目:石家庄市科学技术研究与发展计划（141071271A，171501232A）；河北省高等学校科学研究项目（Z2014112）；石家庄学院化工工艺科研团队资助项目（2017） |
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| The Structure and Thermal Stability of Parafilm |
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LI Zhong-qiu, XIE Li-bin, DU Lin-nan, FENG Li-xin, ZHAO Ting-ting, YU Hong-wei
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School of Chemical Engineering, Shijiazhuang University, Shijiazhuang 050035, China
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| Abstract: |
| The work aims to molecular structure of Parafilm by infrared spectroscopy. The one-dimensional variable temperature infrared spectroscopy, second derivative variable temperature infrared spectroscopy, fourth derivative variable temperature infrared spectroscopy and deconvolution variable temperature infrared spectroscopy of Parafilm were respectively studied by Fourier transform attenuated total reflection infrared spectroscopy (ATR-FTIR). There were mainly eight infrared absorption modes, including CH3 asymmetrical stretch vibration, CH2 asymmetrical stretch vibration, CH2 symmetrical stretch vibration, CH2 scissoring vibration, CH3 asymmetrical scissoring vibration, CH3 symmetrical scissoring vibration, C—C skeleton stretch vibration and CH2 in plane rocking vibration in Parafilm. The finalized main molecular structure of Parafilm was polyisobutene. In the temperature range of 293~393 K, the Parafilm thermal stability was further studied by variable temperature ATR-FTIR. The thermal stability of Parafilm was poor and its critical operating temperature was 313 K. The study has expanded the key roles of variable temperature ATR-FTIR in the analysis of structure and thermal stability of the polymer packaging materials. |
| Key words: infrared spectroscopy Parafilm structure thermal stability polyisobutene |
