New Family of Multistimuli-Responsive Acrylamide-Based Homopolymers: Synthesis, Responsive Behavior, and Application in Controlled Release

作者：Ke Wang, Xiaofang Liu, Ziyan Li, Fan Zhao, Guiyan Liu, Yong‐Fei Zeng · 发表于：Macromolecules · 年份：2025 · DOI：10.1021/acs.macromol.5c00573 · 被引用次数：13 · 研究领域：Advanced Polymer Synthesis and Characterization、Hydrogels: synthesis, properties, applications、Synthesis and properties of polymers

A new family of multistimuli-responsive acrylamide-based homopolymers with different end pendant substituents were prepared by reversible addition–fragmentation chain transfer (RAFT) polymerization. They include three types of multistimuli-response: temperature/pH/CO 2 -response, temperature/pH/redox-response, and temperature/pH/light-response. When the terminal substituent was ethyl and tetrahydropyran, P(Et-N-AM) and P(THP-N-AM) exhibited lower critical solution temperature (LCST) behavior in water, which can be adjusted by degree of polymerization (DP) and concentration of polymer, additives, pH, and the injection of CO 2 /N 2 to the solution. When the terminal substituents were phenyl, ferrocene, and azobenzene, P(Ph-N-AM), P(Fc-N-AM), and P(Azo-N-AM) were insoluble in water due to the increase of hydrophobicity, but the upper critical solution temperature (UCST) was exhibited in the mixed solution of n BuOH/water and can be adjusted by the addition of acid or base. P(Fc-N-AM) was also redox-responsive, and its UV/vis absorption peaks changed with the addition of FeCl 3 /VC. P(Azo-N-AM) was also light-responsive, and under UV/blue light radiation, the characteristic peaks of its UV/vis absorption spectrum changed reversibly. In addition, the three homopolymers were amphiphilic, which can self-assemble in solution, and the obtained micelles were also responsive. Finally, nile red (NR) was used as a hydrophobic drug model, and the controlled release behavior of NR-loaded mi...