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Compared with the single polymer micelle system, the polyion complex micellar system is consisted of two or more polymers with different composition, which has more flexible structural adjustment and better performance, making them widely used in drug control release. In this work, two azobenzene-based amphiphilic copolymers P (MMA-co-PEGMA-co-NIPAM-co-HAZOMA) with ionized carboxyl and P (MMA-co-PEGMA-co-NIPAM-co-NNAZOMA) with protonated tertiary amine group were synthesized by reversible additionfragmentation chain transfer (RAFT) polymerization. We studied selfassembled behavior of polymers and multi-component polymers, including their multiple responsiveness and the encapsulation, controlled release properties of polyion complex micelle. Light, pH, temperature, and reduction responsiveness of three micelles were investigated by UV-vis spectroscopy, transmission electron microscope (TEM), and dynamic light scattering. Compared to RCP 1, and RCP 2, RCP 1/RCP 2 micelle can release Nile red in both acidic and alkaline environment. When temperature reached critical solution temperature, RCP 1/RCP 2 micelle would release Nile red faster. Polyion complex micelle had better release performance compared to single micelles at the same environment, and could release in a wider range pH, making it had more potential applications in biological science field.

In this study, DBNs‐aminated layered double hydroxide (ALDH) was prepared by connecting ALDH with hydroxylated boron nitride nanosheet (OH–BNs) which was obtained by high‐temperature steam method from hexagonal boron nitride nanosheet (h‐BNs) through the polydopamine. DBNs‐ALDH was characterized by fourier‐transform infrared spectroscopy, x‐ray diffraction, scanning electron microscope, energy dispersive spectrometer, transmission electron microscope, Raman, and x‐ray photoelectron spectroscopy analyses to prove the success of the synthesis. Change of chloride ion concentration was chosen to evaluate the ion exchange function of DBNs‐ALDH. Then, the epoxy resin (EP) mixed with DBNs‐ALDH was coated on the Q215 steel to form a composite epoxy coating. The electrochemical impedance spectroscopy test and brine immersion test were used to characterize the anticorrosion performance of composite EP coating. The results revealed that the DBNs‐ALDH reinforced the anticorrosion performance of the EP coating.