Abstract
Poly(2‐(diethylamino)ethyl methacrylate) (PDEAEMA) macroinitiator is prepared in water by aqueous reversible addition–fragmentation chain transfer (RAFT) polymerization under CO2 atmosphere, and then used directly as a stabilizer in emulsion polymerization, without requiring further purification, to yield CO2‐switchable latexes of poly(methyl methacrylate) (PMMA) and polystyrene (PS). Chain extension of the PDEAEMA macroinitiator with styrene (S) leads to the in situ formation of poly(DEAEMA‐b‐S) diblock copolymers in a one‐pot process. The final latexes are pH and CO2‐responsive and can be coagulated by N2 bubbling and subsequently redispersed by CO2 bubbling. The effects of various parameters on the latex properties are investigated, including pH, concentration of macro‐RAFT agent, using MMA as comonomer and initiator concentration. The results show that replacing only 5 mol% MMA in emulsion polymerization of styrene eliminates the induction time and also has a significant influence on the particle size distribution.image
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