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A Facile Photocontrolled Iodine‐Mediated Reversible‐Deactivation Radical Polymerization System: Solution Polymerization of Methacrylates under Irradiation with NIR LED Light
摘要： Herein, near-infrared (NIR) photocontrolled iodine-mediated reversible-deactivation radical polymerization (RDRP) of various methacrylates without external photocatalyst was developed using alkyl iodide (e.g., 2-iodo-2-methylpropionitrile, CP-I) as the initiator at room temperature. We report the first example of using a series of special solvents containing carbonyl groups (e.g., 1,3-dimethyl-2-imidazolidinone (DMI), N,N-dimethylacetamide (DMAc), tetramethylurea (TMU), 1,3-dimethyl-tetrahydropyrimidin-2(1H)-one (DMPU), and N-methyl pyrrolidone (NMP)) as both solvent and catalyst for photocontrolled RDRP under irradiation with a long wavelength (λmax = 730 nm) light-emitting diode (LED) light. Therefore, the NIR photocontrolled polymerization system has the simplest components: monomer, alkyl iodide initiator and solvent. Well-defined polymers were synthesized with excellent control over the molecular weights and molecular weight distributions (Mw/Mn < 1.21). The “living” features of this promising NIR photocontrolled iodine-mediated RDRP system were confirmed by polymerization kinetics, multiple controlled “on-off” light switching cycle regulation, and chain extension experiments. Importantly, the radical polymerizations were also proceeded successfully with various thickness of skin of pork and A4 paper to demonstrate the unique advantages of this simplest polymerization system, which benefitting from the high penetration of NIR light.
关键词： radical polymerization,photopolymerization,alkyl iodide,NIR light,photocatalyst-free
更新于2025-09-12 10:27:22
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A Facile Photocontrolled Iodine-Mediated Reversible-Deactivation Radical Polymerization System: Solution Polymerization of Methacrylates under Irradiation with NIR LED Light
摘要： Herein, near-infrared (NIR) photocontrolled iodine-mediated reversible-deactivation radical polymerization (RDRP) of various methacrylates without external photocatalyst was developed using alkyl iodide (e.g., 2-iodo-2-methylpropionitrile, CP-I) as the initiator at room temperature. We report the first example of using a series of special solvents containing carbonyl groups (e.g., 1,3-dimethyl-2-imidazolidinone (DMI), N,N-dimethylacetamide (DMAc), tetramethylurea (TMU), 1,3-dimethyl-tetrahydropyrimidin-2(1H)-one (DMPU), and N-methyl pyrrolidone (NMP)) as both solvent and catalyst for photocontrolled RDRP under irradiation with a long wavelength (λmax = 730 nm) light-emitting diode (LED) light. Therefore, the NIR photocontrolled polymerization system has the simplest components: monomer, alkyl iodide initiator and solvent. Well-defined polymers were synthesized with excellent control over the molecular weights and molecular weight distributions (Mw/Mn < 1.21). The “living” features of this promising NIR photocontrolled iodine-mediated RDRP system were confirmed by polymerization kinetics, multiple controlled “on-off” light switching cycle regulation, and chain extension experiments. Importantly, the radical polymerization were also proceeded successfully with various thickness of skin of pork and A4 paper to demonstrate the unique advantages of this simplest polymerization system, which benefitting from the high penetration of NIR light.
关键词： radical polymerization,photopolymerization,alkyl iodide,NIR light,photocatalyst-free
更新于2025-09-12 10:27:22