Riboflavin‐Catalyzed Photoinduced Atom Transfer Radical Polymerization
Year: 2024
Type: article
Abstract: The photoATRP of methyl acrylate (MA) is investigated using riboflavin (RF) and CuBr 2 /Me 6 TREN as a dual catalyst system under green LED irradiation (λ ≈ 525 nm). Both RF and CuBr 2 /Me 6 TREN enhanced oxygen tolerance, enabling effective ATRP in the presence of residual oxygen. High molar mass polymers (up to M n ≈ 129 000 g·mol −1 ) with low dispersity ( Đ ≤ 1.16) are prepared, and chain‐end fidelity is confirmed through successful chain extension. The molecular masses of the obtained polymer increased linearly with conversion and showed high initiation efficiency. Mechanistic studies by laser flash photolysis reveal that the predominant activator generation mechanism is reductive quenching of RF by Me 6 TREN (83%, under [CuBr 2 ]/[Me 6 TREN] = 1/3 condition), supported by polymerization kinetics and thermodynamic calculations.
Institutions: Carnegie Mellon University, Bowling Green State University
Language: English
Subfield: Organic Chemistry
Field: Chemistry
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $4,020
Awards: G2274452525, G2440190038
OpenAlex ID: W4403578478