Thermo- and pH-Responsive Nanogel Particles Bearing Secondary Amine Functionalities for Reversible Carbon Dioxide Capture and Release

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• 作者：Patrick D. L. Werz ; Johannes Kainz ; Bernhard Rieger
• 刊名：Macromolecules
• 出版年：2015
• 出版时间：September 22, 2015
• 年：2015
• 卷：48
• 期：18
• 页码：6433-6439
• 全文大小：443K
• ISSN：1520-5835

文摘

We report the synthesis of temperature- and pH-responsive nanogel particles (NPs) consisting of N-isopropylacrylamide (NIPAM) and N-(2,2,6,6-tetramethylpiperidin-4-yl)methacrylamide (TMPMA). NPs can reversibly capture and release carbon dioxide via temperature-induced volume phase transition and changes in pH. These stimuli-responsive particles contain sterically hindered secondary amine functionalities and exhibit a volume phase transition temperature (VPTT) in aqueous solution. The fully reversible VPTT behavior involves a precise shrinkage to 40% of the initial particle size along with a large change in pH from 10.25 to 7.65 upon increasing temperature. We could reversibly release 35 mL (1.4 mmol) of CO₂ per gram of polymer in very short heating times, thereby significantly increasing the amount of CO₂ with respect to the regeneration time. This behavior could be repeated for various cycles at moderate temperatures (85 掳C).