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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。由于傅里叶变换红外光谱(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,阐述了红外光谱技术在scCO2作用体系中的应用以及前景。
Supercritical CO2 (SCCO2) as a physicochemical properties, with high diffusion rate and excellent solubility of the solvent, widely used in scientific research and industrial production. The scCO2 is used in the polymer system. The special interaction between CO2 and polymer facilitates the adsorption and diffusion of CO2 molecules in the polymer. At the same time, through the adsorption of CO2 and the swelling and plasticization of the polymer, the microscopic chemical environment and the overall structural properties of the polymer will change a certain amount. Due to the Fourier transform infrared spectroscopy (FTIR) technology can effectively study the impact of changes in the chemical structure of the molecular structure, this characterization technology in the supercritical CO2 system is widely used. In this paper, we have selected some examples of the application of FTIR technology in polymer systems in recent years. From the interaction mechanism of CO2-polymer and the influence of scCO2 on the processing of polymers or biological macromolecules, the author introduced the infrared spectroscopy Application in scCO2 system and its prospect.