Highly Sensitive CO2-Responsive Polymeric Microgels That Respond Within Seconds

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• 作者：Yiwen Chen ; Tingting Zhao ; Bingshen Wang ; Dengli Qiu ; Ning Ma
• 刊名：Langmuir
• 出版年：2015
• 出版时间：July 28, 2015
• 年：2015
• 卷：31
• 期：29
• 页码：8138-8145
• 全文大小：525K
• ISSN：1520-5827

文摘

In this work, polymeric microgels with swift response to CO₂ are synthesized by polymerization of tertiary-amine containing methacrylate monomers (N,N-diethylaminoethyl methacrylate, DEAEMA) and polyethylene glycol monomethyl ether acrylate (PEGMA) as stabilizers. The obtained microgels are stable but very sensitive to CO₂, which can rapidly swell and further collapse within 5 s upon bubbling of CO₂, or within minutes in an atmosphere of gaseous CO₂. The protonation of the tertiary amine groups in the presence of CO₂ induces sensitive swelling and further irreversible collapse of the microgels due to the internal charge repulsion and relatively low cross-linking density in the core area of microgels. This rapid response to CO₂ may find further applications in the fields of sensitive detection or responsive loading and release upon CO₂ stimulus.