Abstract
Photocatalyzed polymerization using organic molecules as catalysts has attracted broad interest because of its easy operation in ambient environments and low toxicity compared with metallic catalysts. In this work, we reported that 4,7-di(thiophen-2-yl)benzo[c][1,2,5]thiadiazole (DTBT) can act as an efficient photoredox catalyst for photoinduced electron transfer-reversible addition-fragmentation chain transfer (PET-RAFT) polymerization under green light irradiation. Well-defined (co)polymers can be obtained using this technique without any additional additives like noble metals and electron donors or acceptors. The living characteristics of polymerization were verified by kinetic study and the narrow dispersity (Đ) of the produced polymer. Excellent chain-end fidelity was demonstrated through chain extension as well. In addition, this technique showed great potential for various RAFT agents and monomers including acrylates and acrylamides.
Highlights
We can envision that DTBT will be a promising photocatalyst for PET-RAFT polymerization
In order to verify whether DTBT was effective for PET-RAFT polymerization, we chose N, N-dimethylacrylamide (DMA) as the model monomer, 2-((((2-carboxyethyl)thio)carbonothioyl) thio)-2-methylpropanoic acid (CEMP) (Figure S1) as the RAFT agent, N, N-dimethylformamide (DMF) as the solvent, and a blue or green LED as the light source
A control experiment without the RAFT agent was carried out, but no polymerization occurred either. All these results indicated that DTBT can act as a photocatalyst for PET-RAFT polymerization, and the trithiocarbonate molecule acted as both initiator and chain transfer agent
Summary
Many other metallic materials [12,13,14,15,16,17,18,19] have been developed to achieve living/controlled polymerization under irradiation by visible light as well. Developed visible light-cationic and radical polymerizations using using various non-metallic materials. PET-RAFT polymerization for synthesis of well-defined (co)polymers with low molecular weight distribution and polymerization for synthesis of well-defined with this low system molecular distribution high end-group fidelity of product under green(co)polymers light. Has weight great compatibility and high end-group fidelity of product under green light. This system has great in a variety of RAFT agents and monomers.
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
