Degradable and cationic long-subchain hyperbranched block copolymers with well-defined block subchain: Synthesis, characterization and degradation

•Degradable and pre-cationic alternating hyperblock prepared from AB2 macromonomer.•Well-defined subchain architecture, including block number, sequence and length.•Good degradation performance resulting in relatively small pieces.•Potential applications in the field of drug/gene delivery.