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Molecular Weight of Step-Growth Polymers

Molecular Weight of Step-Growth Polymers

Step growth polymerization involves bi or multifunctional monomers. Bifunctional monomers react to form linear step growth polymers, whereas multifunctional monomers react to form non-linear or branched polymers.
As the step-growth polymerization involves step-wise condensation of monomers, the molecular weight also builds up eventually. Consequently, high molecular weight polymers are obtained at the late stages of the polymerization, where 99% of monomers have been consumed.
The extent of the...

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Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers

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Ultrafast Thermal RAFT Depolymerization at Higher Solid Contents.

Dimitra Mantzara¹, Richard Whitfield¹, Hyun Suk Wang¹

¹Laboratory of Polymeric Materials, Department of Materials, ETH Zurich, Zurich, 8093, Switzerland.

ACS Macro Letters

|February 10, 2025

Summary

This summary is machine-generated.

This study introduces a radical initiator to accelerate thermal reversible-deactivation radical polymerization (RAFT) depolymerization. This innovation enables faster recycling of polymers under more concentrated conditions and in various solvents.

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Area of Science:

Polymer Chemistry
Chemical Recycling
Sustainable Materials

Background:

Thermal reversible-deactivation radical polymerization (RAFT) depolymerization is an emerging chemical recycling method.
Current RAFT depolymerization methods are limited by specialized solvents, long reaction times, and dilute conditions.

Purpose of the Study:

To overcome limitations of existing thermal RAFT depolymerization techniques.
To enhance the efficiency and applicability of polymer chemical recycling.

Main Methods:

Introduction of a commercial radical initiator to kinetically untrap depolymerization.
Optimization of initiator concentration for rate acceleration.
Testing depolymerization yields across various solvents and higher concentrations.

Main Results:

A 72-fold rate acceleration was achieved by optimizing initiator concentration, completing depolymerization in 5 minutes.
High depolymerization yields were maintained with a 20-fold increase in repeat unit concentration.
Successful monomer recovery was demonstrated in diverse solvents like DMSO, anisole, and toluene.

Conclusions:

Radical initiators significantly enhance thermal RAFT depolymerization rates and efficiency.
This optimized method broadens the scope of RAFT depolymerization for practical polymer recycling.
The findings provide mechanistic insights and expand applications for sustainable polymer chemistry.