Details

Autor(en) / Beteiligte

• Pachfule, Pradip
• Acharjya, Amitava
• Roeser, Jérôme
• Sivasankaran, Ramesh P
• Ye, Meng-Yang
• Brückner, Angelika
• Schmidt, Johannes
• Thomas, Arne

Titel

Donor-acceptor covalent organic frameworks for visible light induced free radical polymerization

Ist Teil von

• Chemical science (Cambridge), 2019-09, Vol.1 (36), p.8316-8322

Ort / Verlag

England: Royal Society of Chemistry

Erscheinungsjahr

2019

Link zum Volltext

Quelle

EZB Free E-Journals

Beschreibungen/Notizen

• Covalent organic frameworks (COFs) are promising materials for applications in photocatalysis, due to their conjugated, porous and chemically stable architectures. Alternating electron donor-acceptor-type structures are known to enhance charge carrier transport mobility and stability in polymers and are therefore also interesting building units for COFs used as photocatalysts but also as photoinitiator. In this work, two donor-acceptor COFs using electron deficient 4,4′,4′′-(1,3,5-triazine-2,4,6-triyl)trianiline and electron rich thiophene-based thieno[3,2- b ]thiophene-2,5-dicarbaldehyde or [2,2′-bithiophene]-5,5′-dicarbaldehyde linkers are presented. The resulting crystalline and porous COFs have been applied as photoinitiator for visible light induced free radical polymerization of methyl methacrylate (MMA) to poly-methyl methacrylate (PMMA). These results pave the way to the development of robust and heterogeneous systems for photochemistry that offers the transfer of radicals induced by visible light. Crystalline and porous covalent organic frameworks (COFs) with donor-acceptor moieties in their backbone are utilized as initiators for visible light induced radical polymerization. The COFs are efficient photoinitiators, maintaining their structural integrity for several cycles.