Abstract
Directly and indirectly acting photoinitiating systems for cationic ring opening polymerization (ROP) of ϵ-caprolactone (ϵ-CL) by using diphenyl iodonium salt (DPI) in the presence of benzyl alcohol were studied and mechanistic details were evaluated. In the direct system, the polymerization is initiated by a Brønsted acid formed upon UV irradiation of DPI. Polymerizations by indirectly acting photoinitiating systems proceeding via electron transfer reactions of photochemically formed electron donor radicals or excited states of polynuclear aromatic compounds with DPI were investigated. It was demonstrated that polymerizations proceed in a controlled manner by an activated monomer (AM) mechanism. Applicability of the photoinitiation to the other lactone monomers was validated on the example of δ- valerolactone (δ-VL).
| Original language | English |
|---|---|
| Pages (from-to) | 1089-1093 |
| Number of pages | 5 |
| Journal | ChemPhotoChem |
| Volume | 5 |
| Issue number | 12 |
| DOIs | |
| Publication status | Published - Dec 2021 |
Bibliographical note
Publisher Copyright:© 2021 Wiley-VCH GmbH
Funding
The authors would like to thank Istanbul Technical University Research Fund for financial support. S.B. would like to thank Council of Higher Education (YOK) and Scientific and Technological Research Council of Turkey (TUBITAK) for financial support.
| Funders | Funder number |
|---|---|
| Istanbul Technical University Research Fund | |
| TUBITAK | |
| YOK | |
| Türkiye Bilimsel ve Teknolojik Araştırma Kurumu | |
| Yükseköğretim Kurulu |
Keywords
- activated monomer mechanism
- caprolactone
- cationic polymerization
- polymerization
- ring-opening polymerization