ArticleACS omega2026
High-Loading Temperature-Responsive Fire-Extinguishing Microcapsules via RAFT Suspension Polymerization.
Article in ACS omega, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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8 authors.
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Abstract
Temperature-responsive fire-extinguishing microcapsules (TFMCs) have garnered considerable attention due to their ability to autonomously release fire-extinguishing agents upon reaching a critical temperature, thereby mitigating the fire spread. The fire-extinguishing performance of TFMCs is determined by the loading capacity of the fire-extinguishing agents. However, conventional fabrication methods typically yield low loading efficiency (<40%), which impairs the fire-extinguishing performance of TFMCs. Herein, we propose a novel strategy to prepare high-loading TFMCs, involving poly-(methyl methacrylate-ethylene glycol dimethacrylate) (P-(MMA-EGDMA)) as the shell material and DMTP as the core material, via RAFT suspension polymerization for the first time. The results demonstrate that a well-defined core-shell structure and robust shell are beneficial to suppress diffusion and leakage of fire-extinguishing agents, thereby enabling high-loading TFMCs. RAFT polymerization markedly facilitates the formation of well-defined core-shell structures. Moreover, increasing EGDMA content and introducing methacrylic acid (MAA) as a functional comonomer improve the shell mechanical strength. However, excessive EGDMA content disrupts core-shell structure formation, and either an excessively high or low RAFT/ADVN mass ratio can result in the rupture of TFMCs. When the mass ratio of shell monomers (MMA/MAA/EGDMA) is 6/3/1 and that of RAFT/ADVN is 1/2, the resulting TFMCs display a well-defined core-shell structure and an approximately spherical morphology, with an average diameter of 946 nm and a particle size distribution of 1.05, achieving the highest loading efficiency and encapsulation efficiency of 70.6% and 94.3%, respectively. Fire-extinguishing tests show that these TFMCs reduced the extinguishing time from 58.5 to 11.6 s. This work provides a new approach to encapsulating fluorinated fire-extinguishing agents and lays the foundation for the industrial application of TFMCs.
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