Products Cited in Publications Worldwide Riboflavin-Catalyzed Photoinduced Atom Transfer Radical Polymerization

Riboflavin-Catalyzed Photoinduced Atom Transfer Radical Polymerization

Coskun, Halil Ibrahim; Votruba-Drzal, Thomas; Wu, Hanshu; Jockusch, Steffen; Yilmaz, Gorkem; Matyjaszewski, Krzysztof

DOI:

Abstract

The photoATRP of methyl acrylate (MA) is investigated using riboflavin (RF)and CuBr2 /Me6 TREN as a dual catalyst system under green LED irradiation(λ ≈ 525 nm). Both RF and CuBr2 /Me6 TREN enhanced oxygen tolerance,enabling effective ATRP in the presence of residual oxygen. High molar masspolymers (up to Mn ≈ 129 000 g·mol−1) with low dispersity (Ð ≤ 1.16) areprepared, and chain-end fidelity is confirmed through successful chainextension. The molecular masses of the obtained polymer increased linearlywith conversion and showed high initiation efficiency. Mechanistic studies bylaser flash photolysis reveal that the predominant activator generationmechanism is reductive quenching of RF by Me6 TREN (83%, under[CuBr2]/[Me6 TREN] = 1/3 condition), supported by polymerization kineticsand thermodynamic calculations.

Keywords

ATRP ; photocatalyst ; photopolymerization ; riboflavin

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Tris[2-(dimethylamino)ethyl]amine

A88308233527-91-299%

Tris[2-(dimethylamino)ethyl]amine

79.0/5g

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