Synthesis and self-assembly of amphiphilic gradient copolymer via RAFT emulsifier-free emulsion polymerization

► Amphiphilic gradient copolymer was obtained by RAFT emulsifier-free emulsion polymerization. ► Cosolvents adding into the system could inhibit the homopolymerization of AA. ► RAFT polymerization kinetics under different reaction conditions were discussed in detail. ► The 1H NMR analysis proved the gradient structure of the copolymer. ► The gradient copolymer could form different micelles under different moisture content or pH in selective solvent by TEM.