Abstract
The combination of topology and CO2 switchability could provide new options for amphiphilic copolymers. Cyclic molecules supply novel topologies, and CO2 switching provides stimulus responsiveness. Cyclic poly(2–(diethylamino)ethyl methacrylate)–b–poly(ethylene oxide) and their corresponding block copolymers were prepared from poly(ethylene oxide) and 2–(diethylamino)ethyl methacrylate via atom transfer radical polymerization and Keck allylation with a Hoveyda–Grubbs catalyst. Changes in conductivity, surface activity, and hydrodynamic size were examined to illustrate the switchability of the produced amphiphilic copolymers upon contact with CO2 in the presence of water. The reversible emulsification and switchable viscosity behaviors of the copolymers were also demonstrated.
Highlights
CO2 has promising prospects as a responsive trigger due to its vital advantages of low cost, environmental friendliness, and wide availability
1), which was successfully synthesized from poly(ethylene oxide) and DEAEMA
Conductivity measurements showed that the three polymeric surfactants could be switched numerous times via bubbling with CO2/N2
Summary
CO2 has promising prospects as a responsive trigger due to its vital advantages of low cost, environmental friendliness, and wide availability. Amidines and amines are CO2 –responsive molecules [1,2,3,4] that can react with dissolved CO2 in water and generate charged amidinium bicarbonate or ammonium salts. These reactions can be reversed by Ar or N2 bubbling. Many different responsive approaches in which CO2 is used as a trigger in the form of surfactants [5], solvents [6], organic salts [7], and polymer emulsions [8] have been reported to achieve this goal.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
