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Related Concept Videos

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: 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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Characteristics and Nomenclature of Copolymers01:24

Characteristics and Nomenclature of Copolymers

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Copolymers are the products obtained from the polymerization of multiple monomer species. So, in a polymer chain itself, there can be multiple repeating units that come from different monomers. The process of synthesizing a polymer from different monomer species is called copolymerization. When two monomers are involved, the polymer is known as a bipolymer. Polymers with three and four monomers are termed terpolymers and quaterpolymers, respectively. Figure 1 depicts the copolymerization of...
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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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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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Updated: Jun 15, 2025

Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers
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Closed-loop recyclable polymers: from monomer and polymer design to the polymerization-depolymerization cycle.

Shuaiqi Yang1, Shuai Du1, Jin Zhu2

  • 1Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, Wuxi, 214122, P. R. China. songqi.ma@jiangnan.edu.cn.

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Summary
This summary is machine-generated.

Closed-loop recyclable polymers can be depolymerized into monomers and repolymerized into identical polymers, offering ecological and economic benefits. This review explores various monomers and polymerization methods for these advanced circular polymers.

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Sustainable Chemistry

Background:

  • Extensive plastic use depletes fossil resources and generates significant waste.
  • Traditional recycling methods often result in material degradation.
  • Closed-loop recyclable polymers offer a sustainable alternative with inherent recyclability.

Purpose of the Study:

  • To provide a comprehensive overview of readily closed-loop recyclable polymers.
  • To discuss polymers based on monomer and polymer design, and reversible polymerization reactions.
  • To highlight the ecological and economic benefits of plastic waste recycling.

Main Methods:

  • Review of literature on closed-loop recyclable polymers.
  • Categorization of polymers based on various monomers (lactones, carbonates, olefins, etc.).
  • Analysis of polymerization and depolymerization mechanisms, conditions, and outcomes.

Main Results:

  • Summary of circular polymers derived from diverse monomers like lactones, cyclic carbonates, and olefins.
  • Discussion of polymerization yields, molecular weights, and polymer performance.
  • Systematic review of monomer recovery and depolymerization equipment.

Conclusions:

  • Closed-loop recyclable polymers represent the next generation of sustainable materials.
  • Further research into monomer design and polymerization techniques is crucial.
  • Addressing challenges and exploring future prospects will advance circular polymer technology.