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Related Concept Videos

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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Hydrolysis01:15

Hydrolysis

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Overview
Hydrolysis is a chemical reaction in which the addition of water breaks down a polymer into its simpler monomer units. For example, peptides break into amino acids, carbohydrates into simple sugars, and DNA into nucleotides. Enzymes often facilitate these processes.
Hydrolysis Reverses Dehydration Synthesis
Complex carbohydrates can be broken down by breaking the bonds between individual sugar units. The reaction breaks a glycosidic bond as water is added to the compound. The...
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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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Radical Formation: Homolysis00:54

Radical Formation: Homolysis

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A bond is formed between two atoms by sharing two electrons. When this bond is broken by supplying sufficient energy, either two electrons can be taken up by one atom forming ions by the cleavage called heterolysis, or the two electrons are shared by two atoms, with one each creating radicals by the cleavage called homolysis.
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Polymers02:34

Polymers

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The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the...
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Radical Chain-Growth Polymerization: Mechanism01:09

Radical Chain-Growth Polymerization: Mechanism

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The radical chain-growth polymerization mechanism consists of three steps: initiation, propagation, and termination of polymerization. The polymerization initiates when a free radical generated from the radical initiator adds to the unsaturated bond in the monomer. The unpaired electron of the free radical and one π electron in the unsaturated bond creates a σ bond between the free radical and the monomer. As a result, the other π electron in the unsaturated bond converts this...
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Updated: Oct 26, 2025

Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers
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Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers

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Depolymerization of Hydroxylated Polymers via Light-Driven C-C Bond Cleavage.

Suong T Nguyen1, Elizabeth A McLoughlin1, James H Cox1

  • 1Department of Chemistry, Princeton University, Princeton, New Jersey 08544, United States.

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|August 2, 2021
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Summary
This summary is machine-generated.

New catalytic methods enable plastic recycling using visible light to break down polymers into valuable monomers. This approach also facilitates the creation of new, degradable plastic materials for a circular economy.

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Area of Science:

  • Polymer Chemistry
  • Sustainable Materials Science
  • Catalysis

Background:

  • Persistent plastic waste poses a significant ecological crisis.
  • Advanced chemical technologies are crucial for recycling plastic waste and designing degradable materials.

Purpose of the Study:

  • To develop a novel catalytic depolymerization method for plastic waste.
  • To create next-generation degradable polyolefin materials.

Main Methods:

  • Visible light-induced catalytic depolymerization of phenoxy resin and hydroxylated polyolefins.
  • Proton-coupled electron transfer (PCET) activation of hydroxyl groups to generate alkoxy radicals.
  • C-C bond β-scission for polymer chain fragmentation.

Main Results:

  • Successful depolymerization of polymers near ambient temperature.
  • Production of well-defined, isolable product mixtures convertible to polycondensation monomers.
  • Hydroxyl groups modulate thermomechanical properties, enabling diverse material characteristics.

Conclusions:

  • Demonstrated a light-driven C-C bond cleavage strategy for polymer recycling.
  • Potential to establish new circular economy pathways for polymers.
  • Influences the development of degradable-by-design polyolefin materials.