Air-Tolerant Reversible Complexation Mediated Polymerization (RCMP) Using Aldehyde.

Area of Science:

• Polymer Chemistry
• Organic Synthesis

Background:

• Reversible complexation mediated polymerization (RCMP) typically requires stringent anaerobic conditions.
• Existing RCMP methods often necessitate the addition of external catalysts, increasing complexity and cost.

Purpose of the Study:

• To develop an air-tolerant RCMP technique that operates without prior deoxygenation.
• To create a system where the polymerization catalyst is generated in situ, simplifying the process.

Main Methods:

• An air-tolerant system was designed incorporating a monomer, alkyl iodide initiating species, oxygen, an aldehyde, N-hydroxyphthalimide (NHPI), and a base.
• Oxygen was consumed via NHPI-catalyzed oxidation of aldehyde to carboxylic acid, which was then converted to a carboxylate anion by the base.
• The in situ generated carboxylate anion acted as the catalyst for RCMP.

Main Results:

• The developed technique successfully polymerized various monomers including methyl methacrylate, butyl methacrylate, benzyl methacrylate, 2-hydroxyethyl methacrylate, and styrene.
• Polymers were obtained with relatively low dispersity (M_w/M_n = 1.20–1.49).
• The system demonstrated air tolerance and eliminated the need for external RCMP catalysts.

Conclusions:

• A facile and air-tolerant RCMP polymerization method has been established.
• The in situ generation of the RCMP catalyst from readily available components offers a significant advantage.
• This approach broadens the applicability of RCMP techniques in polymer synthesis.