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Polymers are classified as linear or branched on the basis of their chain architecture. The polymer chains in linear polymers have a long chain-like structure with minimal to no branching at all. Even if a polymer features large substituent groups on the monomer, which appear as branches to the skeleton, it is not considered a branched polymer. A branched polymer contains secondary polymer chains that arise from the main polymer chain. The branching occurs when the polymer growth shifts from...
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The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the...
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Chain-growth or addition polymerization is successive addition reactions of monomers with a polymer chain. In radical chain-growth polymerization, the reaction proceeds via a free-radical intermediate. The free radical is formed from radical initiators, which spontaneously generate free radicals by homolytic fission. Organic peroxides (such as dibenzoyl peroxide, as shown in Figure 1) or azo compounds are popular radical initiators. A low concentration ratio of radical initiator to monomer is...
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Thermal Solution Depolymerization of RAFT Telechelic Polymers.

Nethmi De Alwis Watuthanthrige1, Richard Whitfield1, Simon Harrisson2

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

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Summary
This summary is machine-generated.

This study explores chemical recycling of telechelic polymers using thermal depolymerization. Bifunctional polymers show improved monomer recovery, advancing polymer recycling and the circular economy.

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Area of Science:

  • Polymer Chemistry
  • Chemical Recycling
  • Sustainable Materials

Background:

  • Thermal solution depolymerization offers low-temperature chemical recycling for polymers.
  • Current methods primarily address monofunctional polymers, limiting recycling scope.
  • Expanding depolymerization to more complex polymer architectures is crucial for circular economy initiatives.

Purpose of the Study:

  • To investigate the chemical recycling of telechelic polymers via thermal solution depolymerization.
  • To evaluate the impact of polymer architecture on depolymerization efficiency and monomer recovery.
  • To demonstrate the potential of bifunctional polymers in enhancing chemical recycling processes.

Main Methods:

  • Synthesis of telechelic polymers using RAFT polymerization.
  • Application of thermal solution depolymerization for monomer recovery.
  • Analysis of molecular weight changes and depolymerization kinetics.
  • Mathematical modeling to interpret depolymerization behavior.

Main Results:

  • Telechelic polymers were successfully depolymerized, yielding monomers.
  • A significant decrease in molecular weight was observed during depolymerization of telechelic polymers.
  • Bifunctional polymer architecture influenced depolymerization kinetics, indicating partial depolymerization.
  • Telechelic polymers with specific terminal groups improved depolymerization conversion by up to 68% compared to monofunctional analogues.

Conclusions:

  • Telechelic polymers are viable substrates for thermal solution depolymerization.
  • Bifunctional polymer design can optimize monomer recovery efficiency.
  • This approach enhances the potential of chemical recycling for a circular economy.