Visible Light-Induced Cationic Polymerization Using Fullerenes
| Autor: | Birol Iskin, Gorkem Yilmaz, Yusuf Yagci, Faruk Yilmaz |
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| Rok vydání: | 2022 |
| Předmět: |
Polymers and Plastics
Organic Chemistry Cationic polymerization Silver hexafluorophosphate Vinyl ether Photochemistry Ring-opening polymerization Inorganic Chemistry chemistry.chemical_compound Monomer Photopolymer chemistry Materials Chemistry medicine Photoinitiator Cyclohexene oxide medicine.drug |
| Zdroj: | ACS macro letters. 1(10) |
| ISSN: | 2161-1653 |
| Popis: | A novel visible light sensitive photoinitiator system for the cationic polymerization of typical monomers, for example, of oxiranes, such as cyclohexene oxide, vinyl ethers, such as iso-butyl vinyl ether, and other vinyl monomers, such as N-vinylcarbazole, using fullerene derivatives is described. The cationic polymerization of these monomers was initiated at room temperature upon irradiation in the visible region (λinc > 400 nm) in bulk or chlorobenzene solutions with polystyrene-C60 (PS-C60) adduct or bare C60, respectively, in the presence of oxidizing salts such as silver hexafluorophosphate (AgPF6) and diphenyliodonium hexafluorophosphate (Ph2I+PF6–). A feasible mechanism, as correlated with optical absorption measurements, free energy changes (ΔG), and proton scavenging studies, involves formation of exciplex by the absorption of light in the first step. Subsequent electron transfer from excited C60 or PS-C60 to oxidizing salt yields radical cations of the fullerene derivatives. Both radical cations... |
| Databáze: | OpenAIRE |
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