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化学进展 2009, Vol. 21 Issue (05): 1023-1033 前一篇   后一篇

• 综述与评论 •

傅立叶变换红外光谱技术在超临界CO2作用聚合物体系中的应用

时静雅; 武培怡*   

  1. （聚合物分子工程教育部重点实验室     复旦大学高分子科学系     上海   200433）
  • 收稿日期:2008-06-23 修回日期:2008-07-29 出版日期:2009-05-24 发布日期:2009-05-05
  • 通讯作者: 武培怡 E-mail:peiyiwu@fudan.edu.cn
  • 基金资助:

    国家自然科学基金

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Application of FTIR Spectroscopy in Polymereric Systems under Supercritical CO2 Processing

Shi Jingya;  Wu Peiyi*   

  1. (Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science,
    Fudan University, Shanghai 200433, China)
  • Received:2008-06-23 Revised:2008-07-29 Online:2009-05-24 Published:2009-05-05
  • Contact: Wu Peiyi E-mail:peiyiwu@fudan.edu.cn

超临界CO2（scCO2）作为一种物理化学性质优良、具有高扩散速率及优良溶解性能的溶剂，在科学研究及工业生产中广受青睐。将scCO2应用于聚合物体系中，CO2 与聚合物间特殊的相互作用有利于CO2分子在聚合物中的吸附与扩散。同时通过CO2的吸附及其对聚合物的溶胀和塑化作用，聚合物所处微观化学环境以及整体结构性质会发生一定的变化。由于傅立叶变换红外光谱（FTIR）技术能够有效地考察化学环境变化对分子结构造成的影响，这一表征技术在超临界CO2作用体系中广为应用。本文主要选取了近年来利用FTIR技术考察scCO2作用于聚合物体系的一些实例，从CO2-聚合物相互作用机理，scCO2对聚合物或生物大分子的加工过程的影响两方面，阐述了利用红外光谱技术在scCO2作用体系中的应用以及前景。

关键词： 傅立叶变换红外光谱技术, 超临界CO2, 溶剂诱导结晶, CO2-聚合物相互作用

Supercritical carbon dioxide (scCO2) is recognized as an outstanding solvent in polymer processing and scientific investigation, arising from its remarkable intrinsic traits such as high diffusivity and excellent solubility. Once applied into polymer processing, the interactions between CO2 and polymers may assist the sorption and diffusion of CO2 in polymer chains, which may perturb the chemical environment of the molecular structure with the penetrating of CO2 molecules, and can be probed by Fourier transform infrared (FTIR) spectroscopy. Besides, scCO2 may improve the mechanical properties of the material, ascribing to the CO2 sorption, the CO2-induced plasticization and the swelling of polymers. FTIR spectroscopy is also proved to be an effective tool in investigating on the structure information, especially of proteins or semicrystalline polymers. In this review, some researches in this field are discussed, in order to illuminate the handling of FTIR in studying the interaction between scCO2 and polymers and revealing the rearrangements of polymer chain at molecular level. Then the promising application of this method in scCO2 induced polymeric materials systems is clarified and prospected.

Contents
1 Introduction
2 Study of the interaction between CO2 and polymers by FTIR
2.1 On the Lewis acid-base interaction
2.2 On the hydrogen bonding in scCO2
3 Study of the polymer processing in scCO2 by FTIR
3.1 On the sorption of CO2 in polymers by ATR-IR
3.2 On the scCO2 induced crystallization of semicrystall polymers
3.3 On the conformational change of proteins in scCO2
4 Conclusion

Key words: Fourier transform infrared (FTIR) spectroscopy, supercritical CO2, solvent induced crystallization, interaction between CO2 and polymers

中图分类号: 

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