Measurement of CO₂ sorption and PEG 1500 swelling by ATR-IR spectroscopy

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• 作者：Irene Pasquali ; Jean-Michel Andanson ; Sergei G. Kazarian ; Ruggero Bettini
• 关键词：PEG 1500 ; CO₂ sorption ; Polymer swelling ; ATR-FTIR
• 刊名：The Journal of Supercritical Fluids
• 出版年：2008
• 出版时间：July 2008
• 年：2008
• 卷：45
• 期：3
• 页码：384-390
• 全文大小：749 K

文摘

In situ high-pressure ATR-IR spectroscopy was applied to simultaneously measure the sorption of CO₂ in polyethylene glycol (PEG) with molecular weight 1500 and the polymer swelling. The band at ca. 2338 cm⁻¹ corresponding to the antisymmetric stretching mode of CO₂ was used to calculate concentration of CO₂ dissolved in PEG while spectral bands of PEG at ca. 1100 cm⁻¹ were used to calculate swelling of PEG as a function of temperature and pressure. This in situ approach allowed to observe CO₂-induced melting of PEG and to assess intermolecular interactions between CO₂ and polymer.