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Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)01:16

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Ring-opening metathesis polymerization or ROMP involves strained cycloalkenes as starting materials. The mechanism of ROMP proceeds by reacting cycloalkene with Grubbs catalyst to give metallacyclobutane intermediate which undergoes a ring-opening reaction to form new carbene. The new carbene reacts with another molecule of cycloalkene. Repetition of these steps leads to the formation of an unsaturated open-chain polymer product. All these steps are reversible, however, relieving the ring...
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The introduction of polyesters has brought major development to the textile industry. The wrinkle-free behavior of polyester blends has eliminated the need for starching and ironing clothes.
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Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

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Acyclic diene metathesis polymerization or ADMET polymerization involves cross-metathesis of terminal dienes, such as 1,8-nonadiene, to give linear unsaturated polymer and ethylene. As ADMET is a reversible process, the formed ethylene gas must be removed from the reaction mixture to complete the polymerization process.
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Olefin Metathesis Polymerization: Overview01:13

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Recently, the development of olefin metathesis polymerization advanced the field of polymer synthesis. Simply put, the reorganization of substituents on their double bonds between two olefins in the presence of a catalyst is known as the olefin metathesis reaction. The use of metathesis reaction for polymer synthesis is called olefin metathesis polymerization.
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Step-Growth Polymerization: Overview01:03

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Step-growth or condensation polymerization is a stepwise reaction of bi or multifunctional monomers to form long-chain polymers. As all the monomers are reactive, most of the monomers are consumed at the early stages of the reaction to form small chains of reactive oligomers, which then combine to form long polymer chains in the late stages. Hence, the reaction has to proceed for a long time to achieve high molecular weight polymers.
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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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Direct Monomer Recovery from Ring-Closing Depolymerization of Thermosets.

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Researchers developed a novel polycarbonate thermoset from alkyl cyclic carbonates (ACCs) and allyloxy cyclic carbonates (AoCCs). This material allows direct monomer recovery via depolymerization, simplifying thermoset recycling.

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Sustainable Chemistry

Background:

  • Thermoset polymer recycling is challenging due to their cross-linked structure.
  • Direct monomer recovery from thermosets without complex separation is highly desirable but difficult.
  • Conventional recycling methods for chemically recyclable thermosets often involve intricate separation processes.

Purpose of the Study:

  • To synthesize a novel polycarbonate thermoset with enhanced properties and facile depolymerization.
  • To achieve direct recovery of monomers from the depolymerization of thermosets.
  • To enable sustainable recycling of thermoset materials.

Main Methods:

  • Copolymerization of alkyl cyclic carbonates (ACCs) with allyloxy cyclic carbonates (AoCCs).
  • Cross-linking of the resulting polycarbonate with tetrathiol compounds via UV irradiation.
  • Ring-closing depolymerization of the cross-linked thermoset to recover monomers.

Main Results:

  • Synthesized cross-linked polycarbonates with improved thermal and mechanical properties.
  • Achieved direct recovery of ACCs and their dimers through depolymerization, bypassing complex separation.
  • Obtained monomer recovery yields ranging from 74.7% to 91.7%.
  • Demonstrated successful repolymerization of recovered monomers into high-quality polycarbonate.

Conclusions:

  • The developed polycarbonate thermoset offers a viable route for direct monomer recovery and recycling.
  • This approach simplifies the recycling of thermosets, reducing environmental impact.
  • The recovered monomers can be reused, promoting a circular economy in polymer materials.