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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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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.
Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists...
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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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Free-Radical Chain Reaction and Polymerization of Alkenes02:35

Free-Radical Chain Reaction and Polymerization of Alkenes

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The conversion of alkenes to macromolecules called polymers is a reaction of high commercial importance. The structure of the polymer is defined by a repeating unit, while the terminal groups are considered insignificant. The average degree of polymerization represents the number of repeating units in the polymer molecule and is denoted by the subscript n.
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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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Molecular Weight of Step-Growth Polymers01:08

Molecular Weight of Step-Growth Polymers

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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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Polyolefin-based Multiblock Copolymers from Cascade ROMP-RAFT Polymerization.

Min Chen1, Guifu Si2, Wen-Jian Zhang1

  • 1Institutes of Physical Science and Information Technology, Key Laboratory of Structure and Functional Regulation of Hybrid Materials of Ministry of Education, Anhui University, Hefei, Anhui, 230601, China.

Angewandte Chemie (International Ed. in English)
|June 20, 2025
PubMed
Summary
This summary is machine-generated.

This study introduces a new method for creating advanced polyolefin-based multiblock copolymers. These novel materials effectively compatibilize and recycle mixed plastic waste, offering a sustainable solution for plastic disposal challenges.

Keywords:
Cascade polymerizationCompatibilizersMultiblock copolymersPlastics upcyclingPolyolefin

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Sustainable Polymers

Background:

  • Plastic waste is a significant environmental issue, with mechanical recycling often requiring specialized additives like amphiphilic block copolymers.
  • Polyolefins constitute a large portion of plastic waste, yet creating polyolefin-based multiblock copolymers is challenging with conventional methods.

Purpose of the Study:

  • To develop a novel cascade polymerization strategy for synthesizing tunable polyolefin-based multiblock copolymers.
  • To demonstrate the utility of these copolymers in compatibilizing and upcycling mixed plastic waste streams.

Main Methods:

  • A cascade ring-opening metathesis polymerization (ROMP) and reversible addition-fragmentation chain transfer (RAFT) polymerization approach was employed.
  • Trithiocarbonate RAFT agents were incorporated into polyolefin main chains via ROMP, followed by chain extension with polar vinyl monomers.

Main Results:

  • Successfully synthesized various polyolefin-based multiblock copolymers with controlled polar segments and microstructures.
  • Achieved high molecular weight and good physical properties in the resulting copolymers.
  • Demonstrated effective compatibilization and upcycling of high-density polyethylene/polymethyl methacrylate (HDPE/PMMA) and HDPE/polyethylene terephthalate (HDPE/PET) mixtures.

Conclusions:

  • The developed cascade ROMP/RAFT strategy provides a versatile route to novel polyolefin-based multiblock copolymers.
  • These copolymers show significant potential for addressing challenges in mixed plastic recycling and upcycling, contributing to a circular economy.