Manganese-Catalyzed Batch and Continuous Flow Cationic RAFT Polymerization Induced by Visible Light

Area of Science:

• Polymer Chemistry
• Organic Synthesis
• Photocatalysis

Background:

• Controlled polymerization techniques are crucial for synthesizing advanced polymer materials.
• Cationic polymerization often requires harsh conditions or specialized initiators.
• Visible light-mediated polymerizations offer milder and more sustainable synthetic routes.

Purpose of the Study:

• To develop a novel manganese-catalyzed cationic reversible addition-fragmentation chain transfer (RAFT) polymerization system.
• To achieve controlled synthesis of poly(vinyl ether)s using visible light.
• To demonstrate the applicability of this method in both batch and continuous flow reactors.

Main Methods:

• Utilizing a commercially available manganese carbonyl bromide complex as a photocatalyst.
• Employing visible light irradiation to initiate cationic RAFT polymerization.
• Synthesizing poly(vinyl ether)s at room temperature without prior monomer purification.

Main Results:

• Successfully prepared well-defined poly(vinyl ether)s with controlled molecular weights and narrow molecular weight distributions (MWDs).
• Demonstrated the robustness of the manganese-catalyzed system for cationic RAFT polymerization.
• Extended the application to both batch and continuous flow polymerization setups.

Conclusions:

• Manganese-catalyzed visible light-induced cationic RAFT polymerization is a viable and efficient method.
• This technique provides a mild and convenient route to well-defined poly(vinyl ether)s.
• The developed method is adaptable for scalable continuous flow synthesis under ambient conditions.