Catalytic Living Ring-Opening Metathesis Polymerization Using Vinyl Ethers as Effective Chain-Transfer Agents

Area of Science:

• Polymer Chemistry
• Catalysis
• Materials Science

Background:

• Living polymerization techniques enable precise control over polymer architecture.
• Ring-opening metathesis polymerization (ROMP) is a versatile polymerization method.
• Traditional living ROMP often requires high catalyst loadings and can be less sustainable.

Purpose of the Study:

• To develop a novel, more sustainable living ring-opening metathesis copolymerization (ROMP) method.
• To achieve precise control over polymer synthesis with reduced catalyst usage.
• To demonstrate the versatility of the new method in creating complex polymer structures.

Main Methods:

• A catalytic living ROMP approach utilizing a degenerative, reversible, and regioselective exchange of propagating Fischer-carbenes.
• Synthesis of ROMP-ROMP diblock copolymers.
• Grafting-through polymerization: ATRP from a ROMP macro-initiator and living ROMP from a PEG-based macro chain transfer agent.

Main Results:

• Achieved all characteristics of living polymerization: narrow dispersity and excellent molar mass control.
• Demonstrated the ability to form block copolymers.
• Significantly reduced ruthenium complex usage by up to 200 times compared to traditional methods.

Conclusions:

• The developed method provides a cost-effective, sustainable, and environmentally friendly route to polymers and block copolymers.
• This strategy enables the synthesis of degradable polymers with potential applications in biomedicine, materials science, and technology.
• The method offers enhanced control and efficiency in living ROMP.