Oxygen–Nitrogen Switchable Copolymers of 2,2,2‐Trifluoroethyl Methacrylate and N,N‐Dimethylaminoethyl Methacrylate

In this work, a novel class of O 2 /N 2 switchable polymers is reported, which is prepared by atom transfer radical copolymerization (ATRcoP) of commercially available 2,2,2‐trifluoroethyl methacrylate (FMA) and N,N ‐dimethylaminoethyl methacrylate (DMA). The copolymer is random and contains 10 FMA units and 85 DMA units. Its aqueous solution becomes transparent with O 2 bubbling and turns to turbid with N 2 purging. This O 2 /N 2 ‐responsive switchability between the transparent and turbid states is reversible. The FMA–DMA copolymer is thermosensitive and has a lower critical solution temperature (LCST) of 24.5 °C. O 2 molecules interact with fluorinated groups of the copolymer and increase the LCST to 55 °C. Purging N 2 removes O 2 and returns the polymer thermosensitivity back to its initial state. The switchability occurs in the whole temperature range (24.5–55 °C). image