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Related Concept Videos

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

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

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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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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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Olefin Metathesis Polymerization: Overview01:13

Olefin Metathesis Polymerization: Overview

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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.
Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists of a...
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Step-Growth Polymerization: Overview01:03

Step-Growth Polymerization: Overview

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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.
Many natural and synthetic polymers are produced by...
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Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

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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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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.
Similar to cross-metathesis, ADMET also involves the formation of metallacyclobutane intermediate by [2+2] cycloaddition of one of the double bonds of a terminal diene with...
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One Step Block-like Copolymers from an Upcycled Monomer Using Ring-Opening Metathesis Polymerization.

Jeffrey C Foster1, Isaiah T Dishner1, Jackie Zheng1

  • 1Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States.

ACS Polymers Au
|February 16, 2026
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Summary
This summary is machine-generated.

Waste polybutadiene is converted into valuable block-like copolymers using cyclodepolymerization and ring-opening metathesis polymerization. This novel method yields materials with excellent thermomechanical properties and nanophase separation.

Keywords:
block copolymergradient copolymerplastic waste valorizationpolymer materialsring-opening metathesis polymerization

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Organic Synthesis

Background:

  • Block-like copolymers are typically synthesized using monomers with separated reactivity ratios.
  • Polybutadiene can be converted into 1,5,9-cyclododecatriene (CDT) via cyclodepolymerization (CDP).

Purpose of the Study:

  • To explore the gradient copolymerization of CDT with norbornene monomers via ring-opening metathesis polymerization (ROMP).
  • To develop a new pathway for converting waste plastic into high-value thermoplastic materials.

Main Methods:

  • Cyclodepolymerization (CDP) of polybutadiene to produce 1,5,9-cyclododecatriene (CDT).
  • Ring-opening metathesis polymerization (ROMP) of CDT with a norbornene monomer.
  • Characterization of the resulting block-like copolymer's nanophase separation and thermomechanical performance.

Main Results:

  • Successful synthesis of block-like copolymers with a sharp compositional drift.
  • Demonstration of bulk nanophase separation in the resulting copolymers.
  • Attainment of excellent thermomechanical performance in the synthesized materials.

Conclusions:

  • A novel ROMP copolymerization system has been established.
  • A simple and effective method for upcycling waste plastic into advanced thermoplastic materials has been introduced.